Hydrometra okinawana Drake, 1951

(Figs. 6A–E)

Hydrometra okinawana Drake, 1951: 101 (type locality: Japan).

Material examined. INDIA, ANDAMAN AND NICOBAR ISLANDS, Nicobar District, Great Nicobar Island, GNBR, Gandhi Nagar, 16 ft, N 6°49.990’, E 93°53.991’, 23.iv.2012, 1 ♂ (micropterous), Coll. E. Eyarin Jehamalar, (Reg. No. 3157/H15). The examined material is deposited in National Zoological Collection, ZSI-HQ, Kolkata.

Diagnosis. (Fig. 6A). Micropterous ♂ length 8.63, width at metacetabula 0.55, n=1; colour, dark brown; anteclypeus long, conical with acute tip, narrow before apex (Fig. 6B); occurs in apterous, micropterous or brachypterous forms; anterolateral region of seventh abdominal sternum of male with a pair of thorn like projection on each side (Figs. 6D, E); caudal process of male very short (Figs. 6C–E).

Distribution: INDIA: Great Nicobar Island. Elsewhere: Borneo, Japan, Malaysia, Singapore and Thailand (Drake, 1951, Miyamoto, 1964, Polhemus, 1992, Sites & Polhemus, 2003, Yang & Zettel, 2005).