Tachytes modestus Smith

Back, Yeong-Bin & Kim, Jeong-Kyu, 2014, Review of the genus Tachytes Panzer (Hymenoptera: Crabronidae: Crabroninae) of South Korea, with description of one new species, Zootaxa 3795 (3), pp. 301-310 : 308-309

Tachytes modestus Smith

Tachytes modestus Smith, 1856: 299 , ♀ (lectotype designated by Pulawski, 1975: 316), India: Punjab: no specific locality [BMNH]; Tsuneki, 1964a: 2 –3 ( Korea included in distribution in key to Tachytes of Japan and Korea), 5–6 ( Japan: Prefs. Tochigi, Saitama, Ishikawa, Fukui, Mie, Kochi, Ehime, Fukuoka; Korea: Seoul); Tsuneki, 1964b: 63 ( Korea included in distribution in key to Larrinae of Korea and Japan); Kim, 1970: Pl. 57 Fig. 674, 579 (diagnosis based on Korean specimen from Donguleung), 809 (in list of Hymenoptera from Korea); Tsuneki 1974: 362 ( North Korea: Prov. South Pyongan: Desang san, Lyong-ak san); Kim, 1980: pl. xviii HYLA01, 130 (incorrectly as T. modesta , diagnosis and Korean distribution); Tsuneki, 1982: 4 ( North Korea: Prov. Pyong Sung: Bek-sung-li, Za-mo san), 15 (in list of the species of the Sphecidae known from the Korean Peninsula); Paik, 1985: 199 (in list of Sphecidae of Korea); Tsuneki, 1991: 199 (in list of Sphecidae from Korea); Li et al., 2008: 154 –155 ( Korea included in distribution in key to Tachytes of China); Terayama, 2008: 12 (Korean peninsula included in distribution in synopsis of Japanese Larrini species), 20 (in list of Japanese species of the tribe Larrini )..

Diagnosis. Female. Body length 14.2–14.9 mm. MID ca. 3.9 × as long as LID ( Fig. 2 G). Apical margin of clypeus broadly round, with a small broad median notch ( Fig. 2 G). Pygidial plate an isosceles triangle in shape, its apical margin somewhat truncate ( Fig. 3 F). Body black, but largely reddish brown to ferruginous in following parts: apical half or slightly less of all femur, all tibiae, all tarsi, and all spurs and spines.

Male. Smaller, 12.1–14.3 mm long. MID ca. 3.3 × as long as LID ( Fig. 2 H). Bristles on pygidial plate pale golden. Apicomedian notch of clypeus smaller than that of female ( Fig. 2 H). Genitalia as in Fig. 4 G: gonocoxite rod-shape with triangular proximal tubercle; middle part of aedeagus somewhat constricted.

Specimens examined. [ South Korea] 1 ♀, Honghyeon-ri, Nam-myeon, Namhae-gun, Gyeongsangnam-do, 20.viii.2010 (J.K. Kim); 2 ♂, Geumchi-ri, Byeollyang-myeon, Suncheon-si, Jeollanam-do, 19.viii.2010 (J.K. Kim); 1 ♀, ditto, 19.viii.2010 (J.K. Kim); 1 ♀, Jebu-ri, Seosin-myeon, Hwaseong-si, Gyeonggi-do, 15.viii.2010 (J.K. Kim); 1 ♀, Jikjeon-ri, Bukcheon-myeon, Hadong-gun, Gyeongsangnam-do, 7.ix.2002 (T.H. Ahn); 1 ♂, Yonsei Univ. Wonju Campus, Maeji-ri, Heungeop-myeon, Wonju-si, Gangwon-do, 25.vii.1996 (H.W. Byun).

Distribution. India; Myanmar; Taiwan; North China; Korea; Japan.

Figures

FIGURE 2. Head in full frontal views and clypeal apical margin (bottom line drawing of each image) of Korean Tachytes species. A, T. sinensis, female. B, T. sinensis, male. C, T. etruscus sibiricus, female. D, T. etruscus sibiricus, male. E, T. fruticis, female. F, T. fruticis, male. G, T. modestus, female. H, T. modestus, male. I, T. gyusanus n. sp., female. J, T. gyusanus n. sp., male.

FIGURE 3. Selected characteristics of T. gyusanus n. sp. and T. modestus. A-C, T. gyusanus n. sp.: A, head, in dorsal view, showing broader LID; B, propodeal dorsum with dense appressed setae in median part; C, pygidial plate. D-F, T. modestus: D, head, in dorsal view, showing narrower LID; B, propodeal dorsum with shallow median longitudinal furrow, but without dense appressed setae in median part; C, pygidial plate.

FIGURE 4. Male genitalia and sternum VIII. A, genitalia of T. sinensis, in dorsal view. B, sternum VIII of T. sinensis. C, sternum VIII of T. etruscus sibiricus. D, genitalia of T. etruscus sibiricus, in dorsal view. E, sternum VIII of T. fruticis. F, genitalia of T. fruticis, in dorsal view. G, genitalia and sternum VIII of T. modestus, in dorsal view. H, genitalia of T. gyusanus n. sp., in dorsal view. I, genitalia of T. gyusanus n. sp., in lateral view. J, sternum VIII of T. gyusanus n. sp.