Dasyproctus vietnamensis Pham, 2022

Pham, Phong Huy, 2022, Taxonomic studies on Dasyproctus Lepeletier & Brullé (Hymenoptera: Crabronidae) from North Vietnam with description of two new species, Zootaxa 5188 (1), pp. 43-54 : 50-53

7. Dasyproctus vietnamensis Pham , sp. nov.

( Figs 49–61 )

Material examined. Holotype, ♀, pinned (deposited in IEBR), VIETNAM: Ha Noi: Da Ton, Gia Lam , 5–15.xi.2001, Malaise trap, Coll. Mai Phu Quy [ IEBR] . Paratypes ( IEBR): VIETNAM: Vinh Phuc : 1 ♀, Me Linh Station for Biodiversity, Ngoc Thanh , Phuc Yen , 2.vi.2018, sweep net, Coll. Phong Huy Pham [ IEBR] . Ha Noi: 1 ♂, Bai giua Song Hong, Long Bien , 16.viii.2012, sweep net, Coll. Hoa Thi Dang ; 1 ♂, Hoa Lac, Thach That , 05–15.vii.2002, Malaise trap, Coll. Long Dang Khuat [ IEBR] . Ninh Binh: 1 ♂, Thung Den Tran, Trang An , 23.vi.2017, sweep net, Coll. Phong Huy Pham [ IEBR] .

Diagnosis. The new species can be easily distinguished from its congeners by the following combination of characters: in females: head rectangular in frontal view; free margin of clypeus slightly indented medially; scape yellow with small black spot on inner lateral side; mandible yellow basally, reddish to black apically; IOC conspicuous; vertex with sparse, small punctures, and longitudinal, shallow pit near inner eye margin; anterior carina of pronotal collar laterally bending towards insertion of fore coxa; mesopleuron with yellow spot, scutellum with large yellow band medially; propodeum with Y-shaped furrow posteriorly; hind tibia yellow postero-dorsally except at apex, with hook-shaped carina postero-dorsally, and brown macula antero-dorsally; tarsomere 1 yellow basally; T1 immaculate; T2 with large, round depression at base; pygidial plate reddish brown, T5 and pygidial plate with brown-yellow setae. In males: IOC present; clypeus with median carina, free margin truncate medially; gena without striae; frons densely punctate; flagellomeres II‒IV cylindrical; mandible entirely black except small yellow spot at base; scutum distinctly sparsely punctate; axilla and two spots on scutellum yellow; T1 immaculate, longer than hind femur, and shorter than T2‒T4 combined, its sides not parallel; T2 with large, round depression at base; T2‒T5 largely, brightly yellow maculate; T6 with largely, brightly yellow band anteriorly. T2‒T7 impunctate.

The new species runs close to D. jungi Ma in the key to Asian and Oceanic Dasyproctus ( Leclercq 2015) in having, in females: vertex with sparse, small punctures, and longitudinal pit near inner eye margin; gena sparsely punctate, with dense short silvery setae; mandible yellow basally; anterior carina of pronotal collar laterally bending towards insertion of fore coxa, medially parallel to anterior margin of scutum; scutum with dense, small punctures; pronotal collar distinctly notched medially; metanotum with longitudinal striae mixed with small punctures; tegula testaceous; propodeum with coarse, oblique rugae dorsally, arched striae laterally, Y-shaped furrow on posterior aspect; T1 immaculate; T2 with large, round depression at base; T2‒T4 with largely, brightly yellow maculae. In males: clypeal with free margin truncate medially; mandible sometimes with small yellow spot at base; IOC distinct; gena sparsely punctate; flagellomeres II‒IV cylindrical; pedicel and flagellum black; scutum with sparse, small punctures; dorsal surface of fore tibia yellow; T1 longer than hind femur; T2 with large, round depression at base. However, it differs from the latter in having, in females: head rectangular; flagellum I brownish; mandible reddish to black apically; vertex with longitudinal, shallow pit near inner eye margin; hind tibia yellow postero-dorsally except apex, with hook-shaped carina postero-dorsally, and brown macula antero-dorsally; all tarsi brown except tarsomere 1 yellow basally; T2 with shallow depression basally; pygidial plate reddish brown; T5 and pygidial plate with brown-yellow setae. In males: mandible entirely black excepting small yellow spot at base; scape except dorsal surface, pronotal collar, pronotal lobe, dorsal surface of fore tibia yellow, yellow band on dorsal surface of mid and hind tibiae medially; petiole dorsally 2.5 × as long as wide; T2 with shallow depression basally; T5 with brightly yellow maculae, T6 with largely, brightly yellow band anteriorly.

Description. Female, holotype ( Figs 49‒54 ): Body length 8.5‒9.0 mm, forewing length 6.0‒ 6.3 mm.

Colour. Body black with following yellow parts: scape except small black spot on inner lateral side; mandible except reddish to black apically; pronotal collar; pronotal lobe; large spot on mesopleuron; axilla; large median band on scutellum; brightly yellow bimaculae on T2‒T5; small apical spot on fore femur; large ventral band on mid femur; ventral surface of fore and mid tibiae; hind tibia except apical part and large spot antero-dorsally; tarsomere 1 basally. Brown to black-brown are: flagellum I, tegula, pedicel, pygidial plate, ventral surface of all tibiae, and all tarsi except tarsomere 1 basally.

Head ( Figs 49 & 52 ): In frontal view nearly rectangular, about 1.5 × as long as wide; mandible tridentate apically, with small tooth on inner margin; clypeus covered with dense silvery setae, slightly beveled, free margin slightly indented medially, blunt tooth on each side of free margin, longitudinal median carina reaching free margin; antennal sockets contiguous with one another and with inner eye margin; scape with two longitudinal, parallel carinae ventrally, length of scape 2.2 × distance between eyes at base of antennal socket; flagellum covered with thick short setae, flagellomere I as long as II, relative lengths of scape: pedicel: flagellomere I = 30: 5: 9; scapal basin with thick, adpressed silvery setae; IOC conspicuous; frons without furrow above IOC, densely punctate; OOD 1.18 × POD; vertex with sparse, small punctures, and well-imprinted supra-orbital fovea; frons and vertex covered with short brownish setae; gena sparsely punctate, with dense short silvery setae.

Mesosoma ( Figs 50 & 53 ): Anterior carina of pronotal collar laterally bending towards insertion of fore coxa, medially parallel to anterior margin of scutum; pronotum conspicuously striate laterally; pronotal collar distinctly notched medially; scutum with dense, small punctures, and a series of short rugae posteriorly; scutellum and mesopleuron with sparse, fine, small punctures; metanotum with longitudinal striae mixed with small punctures; mesopleuron matt; metapleuron shining, with conspicuous, oblique rugae; propodeum with coarse, oblique rugae dorsally, arched striae laterally, Y-shaped furrow on posterior aspect. Mesosoma with white setae, sparse on scutum and denser on propodeum; hind tibia with hook-shaped carina postero-dorsally.

Metasoma ( Figs 51 & 54 ): petiolate; T1 immaculate, with apical width about 2.6 × its basal width dorsally, length of T1 equal to that of hind femur, 1.4 × that of T2‒T4 combined; T2 with large, round depression at base; T1‒T5 with sparse, fine, small punctures; T2‒T5 with large maculae, these on T2 smaller than those on T3 and T4, these on T3 equal to those on T4; pygidial plate with coarse, dense punctures, conspicuously narrowed and gutterlike apically. Metasoma with whitish brown setae except T5 and pygidial plate with brown-yellow setae.

Male, paratype ( Figs 55‒61 ): Body length 6.5‒7.0 mm, forewing length 4.5‒5.0 mm.

Structure as in female, but differing as follows:

Colour. Scape yellow except inner lateral sides; mandible black, sometimes with small yellow spot at base; scutellum black except small yellow spot antero-laterally; mesopleuron sometimes with small yellow spot; small yellow spot on fore femur apically; dorsal surface of fore tibia yellow; yellow band on dorsal surface of mid and hind tibiae medially; large spot on dorsal surface of hind tibia; tegula testaceous; ventral surface of all tibiae blackish brown; T7 and all tarsi dark brown.

Head ( Figs 55 & 58 ): clypeus with free margin truncate medially; mandible bidentate apically; flagellomeres II‒IV cylindrical; frons densely, largely punctate, with shallow, narrow furrow above IOC.

Mesosoma ( Figs 56 & 59 ): Anterior carina of pronotal collar laterally curving towards pronotal lobe; pronotum smooth anteriorly; scutum with sparse, small punctures; scutellum with conspicuous rugae; propodeal dorsum coarsely, largely reticulate.

Metasoma ( Figs 57 & 61 ): petiolate; T1 longer than hind femur, shorter than T2‒T4 combined, its sides not parallel, 2.5 × as long as wide dorsally; T2‒T5 largely maculate, T6 with large yellow band anteriorly. T2‒T7 impunctate. Male genitalia as in Fig. 60 .

Etymology. The specific name of this new species refers to its country of origin, Vietnam.

Distribution. Vietnam: Ha Noi and Vinh Phuc.

Figures

FIGURES 49–54. Dasyproctus vietnamensis Pham sp. nov. Holotype ♀. 49. Head, frontal view; 50. Mesosoma, lateral view; 51. Metasoma, dorsal view; 52. Head, dorsal view; 53. Mesosoma, dorsal view; 54. Habitus, lateral view.

FIGURES 55–61. Dasyproctus vietnamensis Pham sp. nov. Paratype ♂. 55. Head, frontal view; 56. Mesosoma, dorsal view; 57. Metasoma, dorsal view; 58. Head, dorsal view; 59. Mesosoma, lateral view; 60. Genitalia, ventral view; 61. Habitus, lateral view.