Euscyrtus (Osus), Gorochov, 1987

Meena, Ashok Kumar, Swaminathan, Rajamani & Swaminathan, Tatiana, 2020, Some lesser known silent crickets (Orthoptera: Gryllidae: Euscyrtinae) from the hilly tracts of India, Zootaxa 4881 (3), pp. 559-572 : 565-566

Subgenus Osus Gorochov, 1987

Osus Gorochov, 1987: 9 ; Ichikawa et al., 2000: 279; Storozhenko and Paik, 2007: 115.

The sub generic name Osus was established by A V Gorochov, 1987 for the first time with Gryllus (Eneoptera) hemelytrus De Haan, 1842 as the type species by original designation.

Species included in this subgenus:

Euscyrtus (Osus) concinnus (Hann, 1844) ; Euscyrtus (Osus) hemelytrus (Hann, 1844) ; and Euscyrtus (Osus) japonicus Shiraki, 1930

Euscyrtus (Osus) concinnus (Hann, 1844) (Plate II)

Gryllus (Eneoptera) concinnus Haan, 1844 . Temminck, Verhandl., Orth.:231.

Euscirtus concinnus Saussure, 1878 . Mem. Soc. Geneve, 25:626. Euscyrtus concinnus Chopard, 1924a . Rec.lnd. Mus., 26:188. Euscyrtus concinnus Chopard, 1968 . Orth. Cat., 12:419. Euscyrtus concinnus Chopard, 1969 . Fauna Ind. Grylloidea, 2:394. Euscyrtus concinnus Vasanth, 1993 . Stud. Crickets Northeast Ind., 126–127, 178.

Material examined: Ƌ (26): India, Tamil Nadu, Coimbatore , TNAU, 19.i.2014, 11° 0’ 44.5’’ N, 76° 56’ 8.12’’ E, 411 m.; from grasses; coll. R. Nagar (2). Same location, coll. Jhabar Mal , from grasses (2) & mango orchard (3). 20.i.2014, coll. Jhabar mal (1). 22.i.2014, from napier grass; coll. R. Nagar (5) . Karnataka, Kansur, Sirsi , 19.iv.2015, 14° 37’ 10.2’’ N, 74° 50’ 7.44’’ E, 611 m.; from light trap; coll. P. Ganesh (1) . Kerala, Idukki, Wagamon heights, 23.x.2015, 9° 40’ 50’’ N, 76° 52’ 0’’ E, 1200 m.; from grasses; coll. T. Swaminathan (2). Same location, coll. R. Na-gar (2) . Tamil Nadu, Coimbatore, TNAU, May , 2012, 11° 0’ 44.5’’ N, 76° 56’ 8.12’’ E, 411 m.; from grasses; coll. T, Swaminathan (4) .

♀ (24): India, Tamil Nadu, Coimbatore , TNAU, 19.i.2014, 11° 0’ 44.5’’ N, 76° 56’ 8.12’’ E, 411 m .; from grass-es; coll. R. Nagar (1). Same location, coll. Jhabar mal, from grasses (7) & mango orchard (3). Same location, coll. R. Nagar , from napier grass (1); likewise, (1) on 22.i.2014. Kerala, Idukki, Wagamon heights, 23.x.2015, 9° 40’ 50’’ N, 76° 52’ 0’’ E, 1200 m .; by net sweep; coll. R. Nagar (2). Same location, coll. T. Swaminathan (1). Tamil Nadu, Coimbatore , TNAU, May, 2012, 11° 0’ 44.5’’ N, 76° 56’ 8.12’’ E, 411 m .; from grasses; coll. T, Swaminathan (5) .

Description of Indian specimens (Male & Female): All identifiable key characters of E. (O.) concinnus are almost similar to the descriptions given by earlier workers. Additional observations to the existing characters include: entire body yellowish, the postero-lateral margins of 8 th tergite with a projection and the antero-lateral thickened margin of 9 th tergite with 3 nodule-like structures (Vasanth, 1993). The male genitalia is with a short epiphallus, the dorsal side deeply notched or bifid with a rounded apical area. Epiphallus has two dorso-lateral spinulose lobes. Phallus with a well developed ramus, which is closely attached to epiphallus with transparent membranous parts, basal part of ramus significantly wider than the apices, length of ramus reaching nearly half of semitubus. Ventral side of epiphallus having transparent paired endoparameral apodemes, semitubus and rachis (= guiding rod) short. The rachis reaches up to almost middle of epiphallus with an acute apex. Spermatophore is brown, almost pearshaped, with one side flat, with a thin long tube. Ovipositor is S-shaped, slightly longer than hind femur, as well as hind tibiae and almost equal to body length; base of ovipositor (1/3 rd) is light brown, while the apical side is dark brown in colour.

Distribution: Indian subcontinent, Indonesia, Mymnar, Thailand, oriental region and North Australia

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