Melanagromyza dolichostigma Meijere

Sasakawa, Mitsuhiro, 2013, Thailand Agromyzidae (Diptera) — 2, Zootaxa 3746 (4), pp. 501-528 : 510-511

Melanagromyza dolichostigma Meijere

Melanagromyza dolichostigma Meijere, 1922: 19 .

Melangromyza cordiophoeta Spencer, 1961a: 71 . syn. nov.

Material examined. ♀, Chaiyaphum, Tat Tone National Park, 15˚59.037´N, 102˚02.103´E, 250 m a.s.l., 21-28 vi 2006, Malaise traap, Lumyai Ittichan; 2♂, Nakhon Nayok, Khao Yai National Park, 14˚24.761´N, 101˚22.815´E, 770 m, 12–19 vii 2006 & 14˚24.619´N, 101˚22.778´E, 770 m, 19–26 vii 2006, Malaise trap, Pong Sandao; ♂, Sakon Nakhon, Phu Phan National Park, 17˚03.543´N, 103˚58.452´E, 312 m, 21–27 vii 2006, Malaise trap, Winlon Kongnara; ♀, Sakon Nakhon, Phu Pha Yon National Park, 16˚55.655´N, 104˚10.658´E, 280 m, 5–11 vii 2006, Malaise trap, Manop Ngoyjansri & Chatree Cheaukamjan; 2♀, Chiang Mai, Doi Inthanon National Park, 18˚32.657´N, 98˚31.482´E 1200 m, 27 ix–5 x & 19–26 x 2006, Malaise trap, Y. Areeluck; ♂, Chiang Mai, Doi Inthanon National Park, 18˚35.361´N, 98˚29.157´E, 2500 m, 27 ix–5 x 2006, Malaise trap, Y. Areeluck; 6♂, Loei, Phu Ruea National Park, 17˚29.907´N, 101˚20.483´E, 1196 m, 5–12 viii 2006 & 17˚30.740´N, 101˚20.650´E, 1353 m, 19–26 ix & 26 ix–2 x 2006, Malaise trap, Nukoonchai Jarroenchai; 5♀, Phetchabun, Khao Kho Ntional Park, 16˚32.546´N, 101˚02.501˚E, 274 m, 5–12 xi 2006, Malaise trap, Somchai Chachumnan & Saink Singtong.

Remarks. This black species is characterized by having the mesoscutum and abdomen strongly shining, with coppery, greenish or bluish sheen, a white fringe on the calypter, a narrow frons (as wide as or slightly wider than eye) and gena (1/7–1/8 as high as eye), a bare eye in the male, a distinctly pubescent arista, and about 15 spines on the surstylus (arranged in one basal row and two rows along anteroventral margin of the projection), and a pair of chitinized processes at end of the distiphallus in addition to a long distal tube curved dorsally at end (phallus of dolichostigma : see Spencer 1973: figs 20, 21; that of cordiophoeta: Spencer 1961 a: fig. 43 and Sasakawa 1963c: fig. 6). The larva is known as an oligophagous stem-borer of Calopogonium , Glycine , Pueraria , Phaseolus and Crotalaria spp. (Leguminosae).

Spencer (1961a) described Melanagromyza cordiophoeta from males caught on the flowers of Cordia cylindristacha (Boraginaceae) in Singapore, and while noting strong similarities with M. dolichostigma , he hesitated to synonymize the two until additional evidence on the larval morphology and mining habits became available (Spencer 1973). However, I have no doubt of its synonymy on the basis of their similar size (wing length 2.2–2.5 mm, longer than 1.6 mm noted by Spencer), and unmistakable complex structures of the phallus.

Distribution. Indonesia (Java), Singapore, Thailand, Taiwan; Papua New Guinea, New Britain, New Ireland; Japan (Ryukyus).