Thambemyia pagdeni Oldroyd, 1956

Figs. 11, 12

Oldroyd, 1956: 211. Type locality: Malaysia: Penang.

Material examined. THAILAND, Gulf of Thailand (South China Sea): 23 males, 15 females, Sakom (Tepha), Songkhla province, Gulf of Thailand (South China Sea), 28 March 2017, cliffs, 6°57′42,97″N 100°50′57.02″E; 29 March 201, on concrete pillars of a pier on a sandy beach 6°56′52,88″N 100°51′52.72″E (PSUNHM) .

Andaman Sea: 1 male, 2 females, Khao Lak, Nang thong, Phang-Nga province, 9 April 1996, rocky beach (reg. 96050, leg. P. Grootaert; on pin in RBINS) ; 3 males, Nang thong beach, 8°37′46.00″N, 98°14′35.43″E, Phang-Nga Province, 3 November 2017, hand collecting on rocks in the sea, leg. P. Grootaert & I. Van de Velde ; 1 male, Nang thong beach, 8°39′06.01″N, 98°14′46.60″E, Phang-Nga Province, 5 November 2017, hand collecting on rocks in the sea, leg. P. Grootaert & I. Van de Velde (RBINS) ; 21 males, 24 females, Ko Phra Thong, 9°07′33.9″N 98°14′58.5″E, Phang-Nga Province, leg. A. Samoh (PSUNHM) .

Diagnosis. Medium-sized (4–4.5 mm) black species with long yellowish brown to black legs. Mainly characterised by the long mouthparts like an elephant trump. The fore legs (Fig. 11) have tarsomere 1 with a ventral notch, tarsomere 2 with a basal protuberance and tarsomere 5 enlarged and flattened. The postpedicel is elongated triangular (2.5 times as long as wide) with a long apical arista. Female with simple fore tarsus (Fig. 12).

Bionomics. The adult flies are found in the splash zone of vertical walls such as cliffs and pillars of jetties.

Distribution. Thailand, Malaysia and Indonesia.