NO. 3562 MALAYAN FLIES—STEYSKAL 3 
bare; proboscis slightly shorter than height of head; palpi a little 
shorter than proboscis, very slender, with only one rather small 
apical bristle. 
Thoracic chaetotaxy: 2 ntpl, 1 pa, 1 de (also a few small anterior 
dorsocentral hairs), 1 acer, 1 sc; pa, de, acr in transverse line some 
distance anterad of scutellum. 
Wing (fig. 1c) hyaline, with poorly developed brown stigma; 
halter pale yellowish. 
Legs slender; f; somewhat clavate, at apical third 0.15 as wide as 
long. Bristles of legs as follows: t; with one short median d and one 
long preapical ad; tf, as in figure 1b; f; with complete row of 16-17 
staggered av, mostly approximately as long as femoral diameter, in 
apical half with 3-4 pv; ts with one long median ad, followed a short 
distance apicad by a smaller d, one ad at apical 1/7, and one each ad 
and pd preapicals; ¢; with basiventral basitarsal bristle and each 
tarsal segment of all tarsi with more or less distinct preapical ad 
and pd; basitarsus,; with a secondary basiventral and 2 median pv; 
basitarsus; slightly enlarged. 
Abdomen with sparse whitish hairs of moderate length; postabdo- 
men (fig. 1d—e) scarcely greater in diameter than preabdomen, dorsal 
valves each with 2 apical processes and rows of black bristly hairs. 
Hototyrre.—Male, Malaya, Selangor Gombak Forest Reserve, tree 
platform, February 24, 1962 (H.E. McClure), USNM 67631. 
This species runs in Frey’s key (1953, pp. 57-71) to H.. nigronitidus 
Brunetti, described from northern India and recorded by Frey from 
northeast Burma; it differs therefrom by its lack of “stiff hairs’? on 
the humerus, narrowly brown knees (except possibly on middle legs), 
pale hairs on the under side of the tarsi, and ‘wollig weissliche 
Behaarung”’ [wooly whitish hairs]. 
Hybos meracrus, new species 
Figures 1f-7 
FErmMaLe.—Length of body 3 mm; wing 3.25 mm. 
Head, thorax, and abdomen shining black; legs, including coxae, 
yellowish, all knees narrowly piceous; ¢, dark drown dorsally; /; 
blackish above in apical 0.15; apical tarsal segments brown. 
Head with eyes contiguous above, ommatidia of upper half twice 
as large as lower ones; antenna (fig. 17) black, arista short plumose; 
proboscis brown, slightly shorter than height of head; palpi nearly as 
long as proboscis, slender, black, bearing a few small bristles at and 
near apex. 
Thorax with pale gray pruinosity on sides and in humeral grooves; 
mesonotum with scanty grayish pruinosity laterally; mesonotum 
posteriorly and scutellum and metanotum with somewhat denser 
