Gambrus homonae Sonan, 1930

Watanabe, Kyohei, 2020, Expression of green fluorescent protein defines a specific population of lamina II excitatory interneurons in the GRP :: eGFP mouse, Bulletin of the Kanagawa Prefectural Museum (Natural Science) 49, pp. 29-66 : 42-43

Gambrus homonae Sonan, 1930 comb. rev.

( Figs 3D, 7 A-E)

(Standard Japanese name: Chahamaki-togarihimebachi) Gambrus homonae Sonan, 1930: 143 .

Description. Female (n=13). Body largely finely coriaceous, covered with silver setae, length 4.5–7.3 mm.

Head 0.62–0.67 × as long as wide. Clypeus sparsely punctate, 0.5 × as long as maximum wide, weakly convex in lateral view, its apical margin rounded and narrowly reflexed. Face 0.5 × as long as maximum wide. Frons rugose anterior to ocelli, with narrow smooth area above antennal sockets. Length of malar space 1.0 × as long as basal mandibular width. Base of mandible almost flat. Upper tooth of mandible almost as long as lower tooth. OD: POL: OOL = 1.0: 1.5–1.6: 1.6–2.0. Flagellum with 23–25 segments. FL I 6.0 × as long as maximum depth in lateral view and 1.2 × as long as FL II.

Mesosoma. Lateral aspect of pronotum reticulate rugose dorsally, longitudinally strigose ventrally. Epomia short and largely indistinct. Posterior end of notauli reached to middle of mesoscutum. Scutellum polished and punctate. Mesopleuron reticulate rugose dorsally and longitudinally rugose ventrally, with a smooth area on speculum. Mesosternum with the short median portion of posterior transverse carina. Sternaulus reaching ca. 0.6 the distance to middle coxa, weakly upcurved. Metapleuron reticulate rugose. Juxtacoxal carina present anteriorly. Propodeum weakly reticulate rugose ( Fig. 7C). Anterior section of lateromedian longitudinal carina present except for anterior part. Anterior transverse carina complete ( Fig. 7C). Posterior transverse carina complete. Pleural carina complete. Propodeal spiracle round to oval. Area basalis trapezoidal, widened anteriorly. Fore wing length 3.4–5.0 mm. Areolet pentagonal, vein 2rs-m and vein 3rs-m convergent anteriorly ( Fig. 7D). Nervellus of hind wing intercepted at or slightly below the middle by second abscissa of vein Cu. Hind femur 5.0–5.2 × as long as maximum depth in lateral view. Hind TS I: II: III: IV: V = 4.0–4.5: 2.0: 1.3: 0.7: 1.1.

Metasoma more or less polished. T I 1.9–2.1 × as long as maximum width, partly smooth, with a few, sparse punctures, without latero-median carina, with complete dorso-lateral carina, with a pair of triangular projections at base. T II 1.0–1.15 × as long as maximum width. T II and T III finely coriaceous, finely punctate. Ovipositor sheath 0.7–0.73 × as long as hind tibia. Apex of ovipositor as Fig. 3D.

Colouration ( Figs 7 A-D). Body (excluding wings and legs) black to blackish brown, except for: basal part of flagEllum and ovipositor rEddish brown; FL VI to FL IX white except for ventral surface; palpi, humeral plate and membranous parts of metasomal sternites whitish yellow; T I to T III red to reddish brown; apex of metasoma with white membranous part. Wings hyaline. Veins and pterostigma blackish brown to brown except for yellowish brown wing base. Fore and mid coxae, trochanters and trochantelli whitish yellow except for basal black area of each coxa. Fore and mid femora and tibiae and fore tarsi reddish brown to yellowish brown. Hind coxa black. Hind trochanter and trochantellus whitish yellow. Hind femur reddish brown except for black apical part. Hind tibia with subbasal white band. Hind tibial spurs whitish yellow. Mid and hind TS I and TS II white to whitish yellow basally, black apically. TS III to TS V black to blackish brown except for narrow white area of TS III. Hind tibia sometimes tinged with reddish brown.

Male (n=19). Similar to female. Face 0.5–0.55 × as long as maximum wide. Length of malar space 0.8–0.9 × as long as basal mandibular width. OD: OOL = 1.0: 1.5–1.6. Flagellum with 26–29 segments, with tyloid from FL 12 to FL 14 or FL 15. FL I 4.3 × as long as maximum depth in lateral view, 1.15–1.2 × as long as FL II. Posterior transverse carina of propodeum weak. Hind femur 4.9–5.1 × as long as maximum depth in lateral view. Hind TS I: II: III: IV: V = 3.8–4.1: 2.0: 1.35–1.5: 0.8–0.9: 0.95–1.0. T I slender, 2.4–2.5 × as long as maximum width. T II 1.2–1.6 × as long as maximum width.Antenna with a white area on FL 12 to FL 13. Base of T IV red to reddish brown. Legs paler than female. Fore and mid coxae usually completely whitish yellow. Mid and hind TS III largely white basally. FL 11, FL 14 and FL 15 sometimes with a white area.

Material examined. JAPAN, NIAES, F, Aomori Pref., Aomori City, Yokouchi to Yaegiku , 5. IX. 1992, T. Ichita leg. ; NIAES, F, Aomori Pref., Aomori City, Moyatouge , 5. IX. 1992, T. Ichita leg. ; NIAES, M, Tokyo, Mt. Takao , 3. V. 1964, J. Minamikawa leg. ; KPM-NK 75851–75853 , 75860–75862 , 1 F & 5 M, Tokyo., Oshima Town, Motomachi, Mt. Omaru , Tsubakinomori, K. Tsujii leg. , 5–31. X. 2012 (MsT); KPM-NK 75854–75859 , 6 M, ditto, 17. VIII. – 5. X. 2012 (MsT) ; NIAES, F, Tokyo, Hachijyojima Is., Ohkagou, 19. VII. 1987, H. Takahashi leg. ; NIAES, F, Tokyo, Hachijojima Is., Nakanogou, 21. V. 1988, H. Takahashi leg. ; NIAES, M, Ibaraki Pref., Tsukuba, Yukarinomori , 14–19. IV. 1989, M. Sharkey leg. (MsT) ; NIAES, F, Niigata Pref., Nakajo Town, Sadaguchiyama , 6. VI. 1980, K. Maeto leg. ; KPM-NK 75847–75850 , 1 F & 3 M, Shizuoka Pref., Higashiizu Town , Inatori, T. Muraki leg. , 11–18. VIII. 2009 (YPT); NIAES, F, Nagasaki Pref., Tsushima Is., Mt. Mokkoku-yama , 16. X. 1983, K. Konishi leg. ; TARI, F (holotype), Kagoshima, 9. VII. 1926, S. Isshiki leg. , em. from Homona magnanima Diakonoff, 1948 ; KPM-NK 76566–76575 , 7 F & 3 M, Kagoshima Pref., Kimotsuke Town, Minamikata, Kanaedake , 18. VII. – 20. VII. 2019, K. Watanabe & K. Matsumoto leg. (YPT).

Distribution. Japan (Honshu, Izu-oshima Is., Hachijojima Is., Tsushima Is. and Kyushu).

Remarks. Townes (1984) changed the generic position of this species from Gambrus to Ischnus . I confirmEd thE character states of holotype and additional specimens. By the result, I conclude that the generic position of this species should be recombined wtih Gambrus (comb. rev.) based on the sternaulus reaching ca. 0.6 the distance to middle coxa, weakly upcurved and the mesosternum with the short median portion of posterior transverse carina. This is thE first rEcord of thE malEs of this spEciEs and of them from Honshu, Izu-oshima Island, Hachijojima Is. and Tsushima Island.