Eotrechus, Kirkaldy, 1902

Basu, Srimoyee, Chandra, Kailash, Venkatesan, Thiruvengadam & Icar-Nbair, 2017, Eotrechus fuscus sp. nov. from Northeastern India with a key to Indian species (Hemiptera: Heteroptera: Gerridae), Acta Entomologica Musei Nationalis Pragae (Acta. Ent. Mus. Natl. Pragae) 57 (2), pp. 391-398 : 397

Key to the known Indian species of Eotrechus (males)

1 Body mainly brown in color, covered with golden or green pubescence. .................... 2

– Body mainly black in color, covered with golden pubescence. .................................... 3

2 Fore femur greatly incrassate throughout or basally. .................................................... 4

– Fore femur simple and very slender, ventral surface without spine-like hairs; pygophore of male with elongated postero-lateral projections and bearing brush-like hairs. ........... .............................................................................................. E. kalidasa Kirkaldy, 1902

3 Body length less than 10 mm; fore femur moderately incrassate in basal part..............5

– Body length more than 10 mm; fore femur slender, without any modification, only slightly incrassate in basal part; pygophore broad with long hair tufts and a pair of long curved projections. ............................................................................. E. fuscus sp. nov.

4 Body length more than 7 mm; genital segment large, ventrally flattened; pygophore sub-quadrangular, with a ventral, transverse depression and with lateral projections. .... ............................................................................................ E. brevipes Andersen, 1982

– Body length more than 7 mm; genital segment wide with almost straight postero-ventral margin; pygophore broad, suboval with paired long bristle-like black hair tufts lateroventrally. ................................................................ E. pilicaudatus Tran & Zettel, 2006

5 Male genital segment relatively large; pygophore suboval with a posteriorly-directed projection on each side, in lateral view, projection of pygophore with a small notch. .... ............................................................................................ E. longipes Andersen, 1982

– Male genital segment depressed and medially grooved; pygophore basally constricted with lateral projection on each side, in lateral view, projection of pygophore without a small notch. ....................................................................... E. terrestris Andersen, 1982