A NEW SPECIES OF SEPEDON FROM THAILAND (DIPTERA: SCIOMYZIDAE) OoKEOw Beaver ( Prakobvitayakit ) Department of Biology, Chiang Mai University, Chiang Mai, Thailand ABSTRACT — Sepedoi\ spangleri (Diptera; Sciomyzidae) is described from Thailand. So far, 6 species of Sepedon have been found in Thailand. They are S. lohifera Hendel, S. ferruginosa (Wiedemann), S. plumhella (Wiedemann), S. senex (Wiedemann), S. sphegea (Fabricius), and S. spangleri, new species. Inasmuch as the biology of the latter species has been studied and awaits publication, it is desirable to de-scribe the species at this time. Sepedon spangleri O. Beaver, new species Male and female. Wing length 4-5 mm. Body length 5-6 mm. Head: Frons dark brown, mostly tomentose, niidfrontal stripe short, extending from ocellar triangle to about middle of frons; 1 pair each of postocellar, vertical, postvertical, and fronto-orbital bristles; base of antennae shiny yellowish; no dark spot on head, but dark brown at edge of dorsolateral side of antennal bases. Antenna rather long, 3rd segment triangular with more or less convex upper margin and about twice as long as 1st segment; 2nd segment about 3 times as long as 3rd; arista plumose, light brown to yellow basally, whitish dlstally. Face bare, yellowish to brown, mostly tomentose, with shiny plceous patch at side of jowl, extending as far below eyes as from antennae to lower margin of eyes. Thorax dorsally gray tomentose, dark brown mesally and laterally; humeral callus bare; 1 pair each of apical scutellar and notopleural bristles; 2 pairs of supra-alars; no bristles on propleuron, mesopleuron, sternopleuron, or hypopleuron. Pleura pale gray tomentose with sooty black patch covering whole metapleuron and extending over a small area of pteropleuron. Legs: Front coxa yellowish, dark brown laterobasally, with 1 moderate and 2 very small apical dorsal bristles and 2 small posterior bristles; mid-and hindcoxae dark brown at base and light brown to yellow dlstally, with external bristle. Femora yellow with apices of fore and sometimes middle pairs darkened, hind femur with only narrow apical flanges darkened. Forefemur with brown posterior stripe and only trace of reddish coloration anteriorly. Stripes of reddish stain on anterior and posterior sides of hindfemur, but reddish stain lacking on mldfemur. All femora with rows of short, stout ventral setae. Fore-and midtlbiae dark brown; hindtlbia so only at base, light brown to yellow dlstally. Tarsi brown, blackish on apical 1 or 2 segments. Wing dull grayish, somewhat darker and brownish toward tip, especially along veins r-m, m-m, last 2 sections of m\ + 2, and last third of r2+3 (fig. 1). Abdomen smootli, black, gray tomentose; postabdomen of male as in fig. 2 and 3; aedeagus with mesally emarglnate, reflexed apical flange; glans with coiled internal filaments; surstylus L-shaped, base lying along margin of epan-drium; speiTn pump a colled, chitlnous structure resembling a snail shell. 86
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