taxonID	type	description	language	source
038F87B9FFA2FFC377AFFCB5FA5120DD.taxon	type_taxon	Type species: “ Chalybion caeruleum ”	en	Pham, Phong Huy, Ohl, Michael, Nguyen, Anh Thi Tu, Nguyen, Dinh Thi (2025): Taxonomy of the genus Chalybion Dahlbom, 1843 (Hymenoptera: Sphecidae) from Vietnam, with description of a new species. Zootaxa 5679 (4): 573-584, DOI: 10.11646/zootaxa.5679.4.6, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
038F87B9FFA1FFC277AFFCDEFAAE22E5.taxon	description	(Figs 1 – 6)	en	Pham, Phong Huy, Ohl, Michael, Nguyen, Anh Thi Tu, Nguyen, Dinh Thi (2025): Taxonomy of the genus Chalybion Dahlbom, 1843 (Hymenoptera: Sphecidae) from Vietnam, with description of a new species. Zootaxa 5679 (4): 573-584, DOI: 10.11646/zootaxa.5679.4.6, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
038F87B9FFA1FFC277AFFCDEFAAE22E5.taxon	materials_examined	Material examined. VIETNAM. Son La: 21 ♀♀, 16 ♂♂; Son La city, Phu Yen, Van Ho, Thuan Chau, and Sop Cop districts; the material was collected between 2017 and 2023. Hoa Binh: 16 ♀♀, 24 ♂♂, Yen Thuy, Mai Chau, Luong Son, Kim Boi, and Da Bac districts; the material was collected between 2001 and 2024. Lao Cai: 2 ♂♂, about 30 km east of Lao Cai city, near Hanoi-Lao Cai highway, 21. ix. 2017. Yen Bai: 2 ♂♂, Yen Bai city, 14. ii. 2015, emerged from a nest; 4 ♀♀, 3 ♂♂, Sa Pa town, 19 – 21. ix. 2017. Ha Noi: 55 ♀♀, 55 ♂♂; Bac Tu Liem, Long Bien, Nam Tu Liem, Cau Giay, Gia Lam, Thach That, Chuong My, Ba Vi, and Soc Son districts; the material was collected between 2001 and 2024. Hung Yen: 3 ♀♀, 5 ♂♂, Hai Trieu, Tien Lu, 25. vi. 2013. Soc Trang: 1 ♀, 1 ♂, My Tu, My Phuoc, 09 ° 34 ' 22.6 " N, 105 ° 45 ' 13.7 " E, 8. v. 2018, insect net. Quang Ngai: 1 ♀, 1 ♂, An Binh, Ly Son, 8. viii. 2017, insect net; 1 ♀, An Hai, Ly Son, 7. viii. 2017, insect net. Ninh Binh: 18 ♀♀, 23 ♂♂; Ninh Binh city, Gia Vien and Nho Quan districts; the material was collected between 2017 and 2024; 12 ♀♀, 6 ♂♂, Cuc Phuong National Park, 30. iv. 2019 (VIE 3), 29. iv. 2019 (VIE 1), 06. v. 2019 (VIE 4). Thai Binh: 27 ♀♀, 82 ♂♂; Hung Ha and Tien Hai districts, Thai Binh city; the material was collected between 2016 and 2022. Thai Nguyen: 2 ♂♂, Phu Luong, 15. vii. 2017; 2 ♀♀, Phu Thuong, Vo Nhai, 5. iii. 2017, nest. Thanh Hoa: 4 ♀♀, 7 ♂♂; Sam Son, Hoang Hoa, and Thach Thanh districts; the material was collected between 2016 and 2022. Vinh Phuc: 3 ♀♀, 8 ♂♂, Me Linh Station for Biodiversity, Me Linh, 19. iv. 2008, 19. v. 2017, 3. vi. 2018, Malaise trap. Nam Dinh: 5 ♀♀, 7 ♂♂, Xuan Thuy National Park, Xuan Thuy, 11. v. 2016, 22 – 25. vii. 2024. Dak Lak: 2 ♀♀, 2 ♂♂, Chu Yang Sin National Park, Krang Bang, 2. v. 2016. Kon Tum: 1 ♀, 1 ♂, Sa Thay town, Sa Thay, 3. iv. 2014; 1 ♂, Chu Mon Ray National Park, Sa Thay, 2. iv. 2014. Nghe An: 6 ♀♀, 10 ♂♂; Cua Lo town, Con Cuong and Nam Dan Districts, the material was collected between 2017 and 2024. Ha Giang: 4 ♀♀, 2 ♂♂, Phong Quang, Vi Xuyen, 25. v. 2022; 2 ♀♀, Bat Dai Son, Quan Ba, 17. vi. 2023. Dien Bien: 1 ♂, Pa Thom, Dien Bien city, 2. iii. 2023. Quang Ninh: 3 ♀♀, 7 ♂♂; Tien Yen town, Uong Bi and Ha Long cities; the material was collected between 2013 and 2023. Phu Tho: 2 ♀♀, 4 ♂♂, Thanh Son town, Thanh Son, Vi. 2011. Tay Ninh: 4 ♀♀, 2 ♂♂, Ninh Son, 28. v. – 11. vi. 2023, Malaise traps; 3 ♀♀, 3 ♂♂, Duong Minh Chau, 11. vi. – 3. vii. 2023, Malaise traps. Ha Tinh: 2 ♀♀, 2 ♂♂, Tram Co, Vu Quang National Park, 27. v. 2024; 1 ♂, Ke Go lake, Cam Le, Cam Xuyen, 2. v. 2019. Hai Duong: 3 ♀♀, 6 ♂♂, Hien Thanh, Kinh Mon, 21. vii. 2016, emerged from collected nests. Cao Bang: 4 ♀♀, 1 ♂, Ngoc Dong, Ha Quang, 28. v. 2022, 13. vi. 2023; 1 ♀, Thanh Long, Ha Quang, 29. v. 2022.	en	Pham, Phong Huy, Ohl, Michael, Nguyen, Anh Thi Tu, Nguyen, Dinh Thi (2025): Taxonomy of the genus Chalybion Dahlbom, 1843 (Hymenoptera: Sphecidae) from Vietnam, with description of a new species. Zootaxa 5679 (4): 573-584, DOI: 10.11646/zootaxa.5679.4.6, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
038F87B9FFA1FFC277AFFCDEFAAE22E5.taxon	distribution	Distribution. Vietnam: Sai Gon, Vung Tau (Dollfuss 2016); Da Nang (Tano & Kurokawa 2015); Bac Ninh, Dak Lak, Ha Noi, Hai Duong, Hoa Binh, Hung Yen, Kon Tum, Lao Cai, Nam Dinh, Nghe An, Ninh Binh, Phu Tho, Quang Ngai, Quang Ninh, Son La, Thai Binh, Thai Nguyen, Thanh Hoa, Vinh Phuc, Yen Bai (Pham 2018; Pham et al. 2019); Cao Bang, Dien Bien, Ha Giang, Ha Tinh, Soc Trang, Tay Ninh (new records). Elsewhere: Australia, Bangladesh, China (including Hong Kong), Egypt, Eritrea, Ethiopia, French Polynesia, Greece, Guam Island, Hawaiian Island, India, Indonesia (Ternate, Misool, Lesser Sunda islands), Iraq, Italy, Japan, Kenya, Kiribati (Gilbert island), Laos, Madagascar (Mascarenes, Seychelles islands), Malaysia, Maldives, Mauritius (Chagos Archipelago), Mozambique, Myanmar, Nepal, New Caledonia, Philippines, Phoenix island, Seychelles islands, Singapore, South Africa, Sri Lanka, Taiwan, Tanzania, Thailand, Timor, United State, Yemen (Socotra island) (Pulawski 2024).	en	Pham, Phong Huy, Ohl, Michael, Nguyen, Anh Thi Tu, Nguyen, Dinh Thi (2025): Taxonomy of the genus Chalybion Dahlbom, 1843 (Hymenoptera: Sphecidae) from Vietnam, with description of a new species. Zootaxa 5679 (4): 573-584, DOI: 10.11646/zootaxa.5679.4.6, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
038F87B9FFA7FFC577AFFF44FA5B23D7.taxon	description	(Figs 7 – 11)	en	Pham, Phong Huy, Ohl, Michael, Nguyen, Anh Thi Tu, Nguyen, Dinh Thi (2025): Taxonomy of the genus Chalybion Dahlbom, 1843 (Hymenoptera: Sphecidae) from Vietnam, with description of a new species. Zootaxa 5679 (4): 573-584, DOI: 10.11646/zootaxa.5679.4.6, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
038F87B9FFA7FFC577AFFF44FA5B23D7.taxon	materials_examined	Material examined. VIETNAM. Hoa Binh: 1 ♀, Tan Lac, Yen Thuy (area of Cuc Phuong National Park), 10 – 25. v. 2002, Malaise trap. Cao Bang: 2 ♀♀, Ban Hau, Cao Thang, Trung Khanh, 22. vi. 2023. Tuyen Quang: 1 ♀, Na Hang, 30. v. 2017. Ninh Binh: 5 ♀♀, Cuc Phuong National Park, 30. iv. 2019 (VIE 5); 5 ♀♀, Cuc Phuong National Park, 6. v. 2019. Dak Lak: 1 ♀, Chu Yang Sin National Park, 2 – 10. vi. 2007, Malaise Traps.	en	Pham, Phong Huy, Ohl, Michael, Nguyen, Anh Thi Tu, Nguyen, Dinh Thi (2025): Taxonomy of the genus Chalybion Dahlbom, 1843 (Hymenoptera: Sphecidae) from Vietnam, with description of a new species. Zootaxa 5679 (4): 573-584, DOI: 10.11646/zootaxa.5679.4.6, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
038F87B9FFA7FFC577AFFF44FA5B23D7.taxon	distribution	Distribution. Vietnam: Tonkin Central, Tuyen-Quan (= currently Tuyen Quang province) (Hensen 1988); Hoa Binh (Pham et al. 2019); Cao Bang, Dak Lak, Ninh Binh (new records). Elsewhere: China, Laos (Pulawski 2024).	en	Pham, Phong Huy, Ohl, Michael, Nguyen, Anh Thi Tu, Nguyen, Dinh Thi (2025): Taxonomy of the genus Chalybion Dahlbom, 1843 (Hymenoptera: Sphecidae) from Vietnam, with description of a new species. Zootaxa 5679 (4): 573-584, DOI: 10.11646/zootaxa.5679.4.6, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
038F87B9FFA7FFC577AFF937FE6925E6.taxon	materials_examined	Material examined. VIETNAM. Son La: 3 ♀♀, Son La city, 1 – 10. v. 2017, 25. ix. – 5. x. 2017, Malaise trap. Ha Giang: 2 ♀♀, Phong Quang, Vi Xuyen, 25. v. 2022. Lao Cai: 3 ♀♀, Bat Xat, 12. vi. 2023. Tuyen Quang: 3 ♀♀, Na Hang, 30. v. 2017, 10. viii. 2017, Malaise trap.	en	Pham, Phong Huy, Ohl, Michael, Nguyen, Anh Thi Tu, Nguyen, Dinh Thi (2025): Taxonomy of the genus Chalybion Dahlbom, 1843 (Hymenoptera: Sphecidae) from Vietnam, with description of a new species. Zootaxa 5679 (4): 573-584, DOI: 10.11646/zootaxa.5679.4.6, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
038F87B9FFA7FFC577AFF937FE6925E6.taxon	distribution	Distribution. Vietnam: Cochichine P. condon (= currently Con Dao island, Ba Ria-Vung Tau Province) (Hensen 1988), Son La (Pham et al. 2019), Ha Giang, Lao Cai, Tuyen Quang (new records). Elsewhere: India, Laos, Sri Lanka (Pulawski 2024).	en	Pham, Phong Huy, Ohl, Michael, Nguyen, Anh Thi Tu, Nguyen, Dinh Thi (2025): Taxonomy of the genus Chalybion Dahlbom, 1843 (Hymenoptera: Sphecidae) from Vietnam, with description of a new species. Zootaxa 5679 (4): 573-584, DOI: 10.11646/zootaxa.5679.4.6, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
038F87B9FFA5FFC777AFFF44FE7D2645.taxon	description	(Figs 12 – 17)	en	Pham, Phong Huy, Ohl, Michael, Nguyen, Anh Thi Tu, Nguyen, Dinh Thi (2025): Taxonomy of the genus Chalybion Dahlbom, 1843 (Hymenoptera: Sphecidae) from Vietnam, with description of a new species. Zootaxa 5679 (4): 573-584, DOI: 10.11646/zootaxa.5679.4.6, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
038F87B9FFA5FFC777AFFF44FE7D2645.taxon	materials_examined	Material examined. VIETNAM. Hoa Binh: 2 ♀♀, 2 ♂♂, Yen Thuy, 30. iii. – 10. iv. 2003, Malaise trap; 1 ♂, Da Phuc, Yen Thuy, 20 – 30. iv. 2003, Malaise trap; 1 ♀, Tan Son, Mai Chau, 10 – 15. iv. 2010, Malaise trap; 3 ♀♀, 10 ♂♂, Tan Vinh, Luong Son, 2. v. 2017; 2 ♂♂, Dong Bang, Mai Chau, 18. v. 2018, nest. Son La: 2 ♀♀, 2 ♂♂, Chieng Bom, Thuan Chau (Copia Natural Reserve), 1010 m, 15. v. 2017; 1 ♀, 2 ♂♂, Son La city, 10 – 20. v. 2017; 2 ♀♀, Son La city, 1 – 10. viii. 2017, Malaise trap. Phu Tho: 4 ♀♀, 3 ♂♂, Kiet Son, Tan Son, 30. iii. 2010; 4 ♂♂, Xuan Dai, Tan Son, 15. iii. 2010; 2 ♀♀, Tan Son town, 12. iv. 2024, nest; 2 ♀♀, 1 ♂, Thu Cuc, Tan Son, 13. iv. 2024, nest. Vinh Phuc: 3 ♀♀, 4 ♂♂, Ngoc Thach, Me Linh, 4. iv. – 4. v. 2001, Malaise trap; 12 ♀♀, 9 ♂♂, Me Linh Station for Biodiversity, 1 – 3. vi. 2018, 12. vi. 2021, insect nets, trap nests; 1 ♀, 3 ♂♂, Tam Dao National Park, Tam Dao, 13. vi. 2012. Ha Tinh: 1 ♂, Ke Go lake, Cam Le, Cam Xuyen, 23. iii. 2019; 6 ♀♀, 3 ♂♂, Vu Quang National Park, Vu Quang, 24 – 27. v. 2024. Nghe An: 4 ♀♀, 1 ♂, Pu Mat National Park, Con Cuong, 21 – 23. v. 2024. Lao Cai: 2 ♀♀, 2 ♂♂, Bat Xat, 21. vi. 2023. Ninh Binh: 2 ♀♀, Gia Sinh, Gia Vien, 24. vi. 2017, insect net; 2 ♀♀, Cuc Phuong National Park, Nho Quan, 29 – 31. vii. 2024; 10 ♀♀, 15 ♂♂, Cuc Phuong National Park, 30. iv. 2019 (VIE 3); 4 ♀♀, Cuc Phuong National Park, 29. iv. 2019 (VIE 1); 1 ♀, Cuc Phuong National Park, 09. v. 2019 (VIE 13); 1 ♀, Cuc Phuong National Park, 06. v. 2019. Ha Noi: 8 ♀♀, 12 ♂♂, Ba Vi National Park, Ba Vi, 28. vi. 2016, 10. vii. 2016, 30. iv. 2017, 6 – 8. viii. 2024; 5 ♀♀, 2 ♂♂, Dong Mo, Ba Vi, 17. viii. 2024, nests; 2 ♀♀, Van Hoa, Ba Vi, 17. xii. 2023, nest. Bac Kan: 2 ♀♀, Deo Gio, Ngan Son, 22. v. 2022; 1 ♂, Sy Binh, Bach Thong, 23. viii. 2024. Ha Giang: 5 ♀♀, Phong Quang, Vi Xuyen, 26. v. 2022; 2 ♀♀, 2 ♂♂, Phong Quang, Vi Xuyen, 3. vi. 2023; 3 ♂♂, Bat Dai Son, Quan Ba, 16 – 19. vi. 2023. Cao Bang: 1 ♀, 1 ♂, Thanh Long, Ha Quang, 12 – 14. vi. 2023; 1 ♂, Ngoc Dong, Ha Quang, 23. v. 2022; 1 ♀, Phong Phin, Deo Gio, 12. vi. 2023. Thai Nguyen: 8 ♀♀, 5 ♂♂, Pho Yen, 30 viii. 2022, trap nests; 1 ♂, Phu Luu, 21. vi. 2020. Quang Ninh: 3 ♀♀, 2 ♂♂, Tien Yen town, 22. viii. 2023, insect net, nest.	en	Pham, Phong Huy, Ohl, Michael, Nguyen, Anh Thi Tu, Nguyen, Dinh Thi (2025): Taxonomy of the genus Chalybion Dahlbom, 1843 (Hymenoptera: Sphecidae) from Vietnam, with description of a new species. Zootaxa 5679 (4): 573-584, DOI: 10.11646/zootaxa.5679.4.6, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
038F87B9FFA5FFC777AFFF44FE7D2645.taxon	distribution	Distribution. Vietnam: Tonkin (= northern Vietnam); Ha Noi and Ha Giang (Hensen 1988); Hoa Binh and Son La (Pham et al. 2019); Bac Kan, Cao Bang, Ha Tinh, Lao Cai, Nghe An, Ninh Binh, Phu Tho, Quang Ninh, Thai Nguyen, Vinh Phuc (new records). Elsewhere: China, Japan, Korea, Laos Philippines, Russian Far East, Thailand, Taiwan (Pulawski 2024).	en	Pham, Phong Huy, Ohl, Michael, Nguyen, Anh Thi Tu, Nguyen, Dinh Thi (2025): Taxonomy of the genus Chalybion Dahlbom, 1843 (Hymenoptera: Sphecidae) from Vietnam, with description of a new species. Zootaxa 5679 (4): 573-584, DOI: 10.11646/zootaxa.5679.4.6, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
038F87B9FFA5FFC777AFFB78FE9A2469.taxon	materials_examined	Material examined. VIETNAM. Ha Noi: 1 ♀, Ba Vi National Park, Ba Vi, 11. viii. 2024. Hoa Binh: 2 ♀♀, 1 ♂, Tan Lac, Yen Thuy, 5. viii. 2017; 11 ♀♀, 9 ♂♂, My Tan, Tan Thanh, Luong Son, 15. v – 1. ix. 2018, trap nests; 77 ♀♀, 60 ♂♂, Kim Son, Kim Boi, 15 – 30. vi. 2019, 1 – 15. vii. 2019, trap nests. Ninh Binh: 2 ♀♀, Cuc Phuong, Nho Quan, 21. vii. 2016. Son La: 1 ♂, Muong Thai, Ham Yen, 11. viii. 2017; 2 ♀♀, Xuan Nha, Van Ho, 19. ix. 2023. Thai Nguyen: 48 ♀♀, 26 ♂♂, Yen Lac, Phu Luong, 25. v. – 03. vi. 2014, 10 – 25. v. 2019, 1 – 15. vii. 2020, 15 – 30. vi. 2020, trap nests. Vinh Phuc: 20 ♀♀; 13 ♂♂, Tam Dao; ii – vii. 2013, iii – viii. 2014; 400 m, trap nests; 16 ♀♀, 9 ♂♂, Me Linh Station for Biodiversity, Me Linh, i – vi. 2013, vii. – xii. 2014, trap nests. Ha Giang: 4 ♀♀, 2 ♂♂, Phong Quang, Vi Xuyen, 25. v. 2022.	en	Pham, Phong Huy, Ohl, Michael, Nguyen, Anh Thi Tu, Nguyen, Dinh Thi (2025): Taxonomy of the genus Chalybion Dahlbom, 1843 (Hymenoptera: Sphecidae) from Vietnam, with description of a new species. Zootaxa 5679 (4): 573-584, DOI: 10.11646/zootaxa.5679.4.6, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
038F87B9FFA5FFC777AFFB78FE9A2469.taxon	distribution	Distribution. Vietnam: Hoa Binh, Son La, Thai Nguyen, Vinh Phuc (Pham & Dang 2017; Pham et al. 2019), Ha Giang, Ha Noi, Ninh Binh (new records). Elsewhere: China, India, Indonesia, Malaysia, Myanmar, Sri Lanka (Pulawski 2024).	en	Pham, Phong Huy, Ohl, Michael, Nguyen, Anh Thi Tu, Nguyen, Dinh Thi (2025): Taxonomy of the genus Chalybion Dahlbom, 1843 (Hymenoptera: Sphecidae) from Vietnam, with description of a new species. Zootaxa 5679 (4): 573-584, DOI: 10.11646/zootaxa.5679.4.6, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
038F87B9FFA5FFC777AFF914FBFE256D.taxon	materials_examined	Material examined. VIETNAM. Hoa Binh: 1 ♀, Tan Vinh, Luong Son, 2. v. 2017. Son La: 2 ♂♂, Chieu Village, Muong Thai, Ham Yen, 11. viii. 2017.	en	Pham, Phong Huy, Ohl, Michael, Nguyen, Anh Thi Tu, Nguyen, Dinh Thi (2025): Taxonomy of the genus Chalybion Dahlbom, 1843 (Hymenoptera: Sphecidae) from Vietnam, with description of a new species. Zootaxa 5679 (4): 573-584, DOI: 10.11646/zootaxa.5679.4.6, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
038F87B9FFA5FFC777AFF914FBFE256D.taxon	distribution	Distribution. Vietnam: Hoa Binh, Son La (Pham et al. 2019; Pulawski 2024).	en	Pham, Phong Huy, Ohl, Michael, Nguyen, Anh Thi Tu, Nguyen, Dinh Thi (2025): Taxonomy of the genus Chalybion Dahlbom, 1843 (Hymenoptera: Sphecidae) from Vietnam, with description of a new species. Zootaxa 5679 (4): 573-584, DOI: 10.11646/zootaxa.5679.4.6, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
038F87B9FFA4FFC677AFFF44FE9523CD.taxon	materials_examined	Material examined. VIETNAM. Thai Binh: 2 ♀♀, Hong Minh, Hung Ha, 24. vi. 2013, Regd. No. 00053 / P 13, Regd. No. 00054 / P 13. Phu Tho: 1 ♀, Thu Cuc, Thanh Son, 22. vi. 2024.	en	Pham, Phong Huy, Ohl, Michael, Nguyen, Anh Thi Tu, Nguyen, Dinh Thi (2025): Taxonomy of the genus Chalybion Dahlbom, 1843 (Hymenoptera: Sphecidae) from Vietnam, with description of a new species. Zootaxa 5679 (4): 573-584, DOI: 10.11646/zootaxa.5679.4.6, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
038F87B9FFA4FFC677AFFF44FE9523CD.taxon	distribution	Distribution. Vietnam: Tonkin (= currently north Vietnam, specific locality not indicated) (Kohl 1918), Thai Binh (Pham 2016), Phu Tho. Elsewhere: China (Hong Kong), Indonesia, Singapore (Pulawski 2024).	en	Pham, Phong Huy, Ohl, Michael, Nguyen, Anh Thi Tu, Nguyen, Dinh Thi (2025): Taxonomy of the genus Chalybion Dahlbom, 1843 (Hymenoptera: Sphecidae) from Vietnam, with description of a new species. Zootaxa 5679 (4): 573-584, DOI: 10.11646/zootaxa.5679.4.6, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
038F87B9FFA4FFC677AFFF44FE9523CD.taxon	discussion	Remarks. Kohl (1918) recorded this species from Tonkin (= currently north Vietnam), but he did not indicate the specific locality. Phu Tho is a province in north Vietnam. Consequently, C. sumatranum is not newly recorded for this province.	en	Pham, Phong Huy, Ohl, Michael, Nguyen, Anh Thi Tu, Nguyen, Dinh Thi (2025): Taxonomy of the genus Chalybion Dahlbom, 1843 (Hymenoptera: Sphecidae) from Vietnam, with description of a new species. Zootaxa 5679 (4): 573-584, DOI: 10.11646/zootaxa.5679.4.6, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
038F87B9FFA4FFC877AFFDF0FC7622C9.taxon	description	(Figs 18 – 24)	en	Pham, Phong Huy, Ohl, Michael, Nguyen, Anh Thi Tu, Nguyen, Dinh Thi (2025): Taxonomy of the genus Chalybion Dahlbom, 1843 (Hymenoptera: Sphecidae) from Vietnam, with description of a new species. Zootaxa 5679 (4): 573-584, DOI: 10.11646/zootaxa.5679.4.6, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
038F87B9FFA4FFC877AFFDF0FC7622C9.taxon	materials_examined	Material examined. Holotype, VIETNAM. Gia Lai: ♀, Kon Chu Rang Natural Reserve, Son Lang, Kbang, 14 ° 42 ' 48 " N, 108 ° 25 ' 24 " E, 861 m, 5. v. 2018, T. T. Nguyen collector. Paratypes, VIETNAM. Gia Lai: 1 ♀, same data as for holotype.	en	Pham, Phong Huy, Ohl, Michael, Nguyen, Anh Thi Tu, Nguyen, Dinh Thi (2025): Taxonomy of the genus Chalybion Dahlbom, 1843 (Hymenoptera: Sphecidae) from Vietnam, with description of a new species. Zootaxa 5679 (4): 573-584, DOI: 10.11646/zootaxa.5679.4.6, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
038F87B9FFA4FFC877AFFDF0FC7622C9.taxon	diagnosis	Diagnosis. Chalybion iridescens sp. nov. is a member of the Chalybion madecassum species-group because of the following combination of characters: Anterior margin of clypeus with three distinct teeth; mandible without inner subapical tooth; supra-antennal plate with transverse carina ventrally; mesosoma about 3.3 × as long as high; metanotal flange small, somewhat produced over propodeum; lower metapleuron with angular carina; tarsi with plantulae; body with white pubescence. Both C. dolichothorax and “ C. iridescens ” sp. nov. differ from the other members of the C. madecassum species-group by having the following characters: Mesosoma more than three × as long as high, propodeal dorsum with pair of longitudinal furrows, and occipital carina evanescent ventrally. The new species is similar to C. dolichothorax, but the differences between them are listed in the key above and in the revised key to the species of the C. madecassum group below.	en	Pham, Phong Huy, Ohl, Michael, Nguyen, Anh Thi Tu, Nguyen, Dinh Thi (2025): Taxonomy of the genus Chalybion Dahlbom, 1843 (Hymenoptera: Sphecidae) from Vietnam, with description of a new species. Zootaxa 5679 (4): 573-584, DOI: 10.11646/zootaxa.5679.4.6, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
038F87B9FFA4FFC877AFFDF0FC7622C9.taxon	description	Description. Female (Figs 18 – 24): Body length 24 – 25 mm, forewing length 16.3 mm. Head (Figs 18 – 20): In frontal view circular. Mandible without inner subapical tooth. Clypeus moderately convex, without median carina; anterior margin of clypeus with three blunt teeth, lateral tooth broader than and as long as median tooth. Frontal line present. Ocelli equal in diameter. Vertical area behind hindocelli slightly raised above eyes. Occipital carina absent ventrally. Clypeus coarsely, sparsely punctate. Frons coarsely, irregularly transversely punctatorugose. Vertex and gena finely, sparsely punctate. Long, white setae sparsely distributed on clypeus, frons and gena. Distance between hindocelli about equal to that from midocellus to hindocellus, ½ × that from hindocellus to inner eye margin, and about 4.6 × that from hindocellus to vertex margin. Flagellar ratio (length of the first flagellomere divided by that of the second flagellomere) 0.94. Orbital ratio (shortest interocular width across vertex divided by shortest interocular width across clypeus) 0.66. Clypeal ratio (length of clypeus divided by shortest interocular width across clypeus) 0.91. Hypostomal cavity ratio (length of hypostomal cavity divided by width) 0.83. Mesosoma (Figs 21, 22, 24): Conspicuously elongate, 3.25 × as long as high. Pronotum not regularly curved in lateral view, 1.4 × as wide as long, without notch at middle, and with series of transverse striae dorsally and laterally. Mesoscutum transversely striate, interspaces shallowly punctate. Mesopleuron densely punctate. Scutellum, metanotum, and metapleuron densely punctate. Propodeum densely, transversely striate dorsally and dorsolaterally, with pair of longitudinal furrows dorsally and dense punctations dorsolaterally. Legs with plantulae, tarsal claws with inner tooth. Metasoma (Figs 23, 24): Integument smooth, dull, with white pubescence. Petiole slightly curved, its length 1.8 × that of hind basitarsus. Metasomal sterna III and IV without micro-pubescence, terminal sternum rounded apically. Color (Figs 18 – 24): Integument dark green. Head and mesosoma with iridescent reflections. Flagellum, labial palpus, maxillary palpus, and tegula black. Mandible red in middle. Wings hyaline, forewing somewhat infuscate apically. Male. Unknown	en	Pham, Phong Huy, Ohl, Michael, Nguyen, Anh Thi Tu, Nguyen, Dinh Thi (2025): Taxonomy of the genus Chalybion Dahlbom, 1843 (Hymenoptera: Sphecidae) from Vietnam, with description of a new species. Zootaxa 5679 (4): 573-584, DOI: 10.11646/zootaxa.5679.4.6, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
038F87B9FFA4FFC877AFFDF0FC7622C9.taxon	etymology	Etymology. The specific name is a Latin adjective referring to the iridescence of the species.	en	Pham, Phong Huy, Ohl, Michael, Nguyen, Anh Thi Tu, Nguyen, Dinh Thi (2025): Taxonomy of the genus Chalybion Dahlbom, 1843 (Hymenoptera: Sphecidae) from Vietnam, with description of a new species. Zootaxa 5679 (4): 573-584, DOI: 10.11646/zootaxa.5679.4.6, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
038F87B9FFA4FFC877AFFDF0FC7622C9.taxon	distribution	Distribution. Vietnam: Gia Lai.	en	Pham, Phong Huy, Ohl, Michael, Nguyen, Anh Thi Tu, Nguyen, Dinh Thi (2025): Taxonomy of the genus Chalybion Dahlbom, 1843 (Hymenoptera: Sphecidae) from Vietnam, with description of a new species. Zootaxa 5679 (4): 573-584, DOI: 10.11646/zootaxa.5679.4.6, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
038F87B9FFA4FFC877AFFDF0FC7622C9.taxon	discussion	Remark. Chalybion dolichothorax differs from other species of the C. madecassum species-group by a markedly elongate thorax (more than three times as long as high). Chalybion iridescens sp. nov. shares this character and, thus, is the second species with an elongate thorax in the species-group.	en	Pham, Phong Huy, Ohl, Michael, Nguyen, Anh Thi Tu, Nguyen, Dinh Thi (2025): Taxonomy of the genus Chalybion Dahlbom, 1843 (Hymenoptera: Sphecidae) from Vietnam, with description of a new species. Zootaxa 5679 (4): 573-584, DOI: 10.11646/zootaxa.5679.4.6, URL: http://dx.doi.org/10.11646/zootaxa.5360.3.8
