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UNITED STATES NATIONAL MUSEUM BULLETIN 224 



long as the upper end vein. Fourth posterior cell closed 

 and stalked, its apex very strongly convex but ante- 

 riorly and posteriorly nearly plane. Anal cell closed 

 and stalked; alula large; ambient vein complete. 



Abdomen: Tlie abdomen is subcylindroid, slightly 

 flattened in the middles of the first two tergites and 

 the whole abdomen rather strongly tapered distally. 

 Pile of abdomen rather sliort dorsally, fine and sub- 

 appressed, becoming longer along tlie posterior mar- 

 gins and moderately abundant, long and bristly on the 

 sides of the first three tergites. The first tergite is lat- 

 erally produced and convex laterally witli 4 bristles on 

 each side ; second tergite with 3 posterolateral bristles, 

 third with 2 or 3 posterolateral elements and with sev- 

 eral, slender, lateral bristles extending forward along 

 the sides; these latter are not apparent in the female. 

 Fourth, fifth and sixth tergites posteromarginaUy on 

 each side with 1 or 2 slender bristles in both sexes. 

 Seven tergites are present dorsally in the male, pro- 

 gi-essively decreasing in length and with a short, lap- 

 petlike lobe of the eighth tergite present on each side 

 laterally, which is only a fourth as long as the seventh 

 tergite. Eighth sternite present, a fifth as long as the 

 seventh sternite. 



Male terminalia exceptionally large and clublike, 

 not rotate; the superior forceps with an apical and 

 ventromedial spur; to this spur is attached a wide, 

 closely adjacent, distal, subtriangular flaplike piece, 

 which is very convex distally. Gonopod short but 

 much larger tlian in Heligmoneura Bigot, and free be- 

 low from enclosure by the forceps. The hypandrium, 

 absent in HeJ'igmoneura, is present in Oligoschema and 

 short, but extended on each side and reduced in the 

 middle. Aedeagus with simple apex. Female termi- 

 nalia exceptionally short, tlie eighth tergite is laterally 

 compressed, the ninth very short. The tenth segment 

 is four times as long as the ninth, shovellike, extended 

 downward, the sides turned downward. Sternites with 

 bristly pile accentuated posteriorly. First sternite 

 without pile. 



Distribution: Oriental: OligoscTiema contorta Wal- 

 ker (1857) ; nuda Becker (1925). I have seen an addi- 

 tional, undescribed species from North Palawan. 



Genus Cinadus Wulp 



FiQUBES 383, 801, 1548, 1557, 2208, 2219, 2224, 2240, 2257 



Cinadus Wulp, Tijdschr. Ent., vol. 41, p. 139, 1898. Type of 

 genus : Cinadus spretus Wulp, 1898, by present designation. 



Cinadus has 2 subgenera, Chaetogonophora, new sub- 

 genus and Ilaplonota Fi-ey. 



Rather large flies with the abdomen moderately stout 

 and the male hypopygimn unusually large and clublike. 

 The large, long, apically high, thin superior forceps 

 bear a rather deep notcli and dorsal process that is 

 rather similar to Heligmoneura Bigot with which it has 

 often been placed. I distinguish Cinadus from related 

 genera on the presence of the large gonopod, wliich is 

 prominent and lateral and not enclosed by the superior 



forceps. Claspers and sometimes pseudoclaspers are 

 present and borne by the gonopod. Paralobi, present in 

 Heligmoneura^ are lacking in Cinadus ; the whole termi- 

 nalia are more open, with larger cavity and the large, 

 long coiled, freely extended aedeagus is a common fea- 

 ture. Last female sternite has very strong bristles. 

 Length 20 mm. 



Head, lateiral aspect: The head is comparatively 

 short, with the eye more or less flattened in front and 

 a large central area of clearly demarcated, enlarged 

 facets. Cheeks short, the face on the upper half near- 

 ly or quite plane with the eye. The lower half is gently 

 produced and moderately prominent in profile because 

 of the ventral recession of the eye. Occiput is very 

 sliort in profile, bearing coarse hairs below and slender 

 bristles in the middle which are deflected downward be- 

 ginning at the upf)er fourth of the head and behind 

 each upper eye corner tliere is a patcli of 3 moderately 

 stout, slightly curved bristles. Proboscis is directed 

 downward, attenuate and comparatively narrowed at 

 apex with a vertical crease on each side a fifth of the 

 distance back from apex. Palpus slender, cylindrical 

 with rather numerous, slender, finely attenuate bristles 

 situated on the outer lialf and apex. Antenna attached 

 at tlie upper third of the head, the first two segments 

 are comparatively elongate, the slender first segment 

 is a little wider and also longer than the slender third 

 segment. Second segment twice as long as wide and a 

 little more than half as long as the first segment. The 

 first two segments each bear dorsal apical setae, ven- 

 tral setae on the first segment and apical setae below 

 on the second segment. Third segment is a little nar- 

 row near the apex with 3 short, dorsal setae and a long, 

 slender arista slightly tliickened at t\\Q apex and bear- 

 ing a short bristle. This arista is distinctly longer than 

 the first two segments together. 



Head, anterior aspect : The width of the head is about 

 11/^ times the height, the face is quite narrow beneath 

 the antenna and not more than a fifth of the head 

 width. It is widened below imtil at least twice its dorsal 

 width. The surface is finely appressed pubescent, with- 

 out pile on the upper half with a narrow, medial, tri- 

 angular patch of moderately stout, wliitish, long 

 bristles on tlie lower face with also a lateral pair of 

 black elements and with 2 or 3 pairs continued down 

 the sides of the subepistoma and occasional bristly hairs 

 included in the upper bristles. The front is very 

 slightly widened, the vertex slightly narrowed. Front 

 flat, pollinose with subappressed, bristly hairs along the 

 eye margin. The vei-tex is deeply excavated; it and 

 the small ocellarium both have vertical sides ; the ocel- 

 larium is set quite far forward, visible in profile with 

 only a pair of tiny bristles behind the ocelli. Behind 

 the vertex the lateral, vertical grooves merge into a 

 very deep, naiTOw, posterior groove. 



Thorax : The thorax is comparatively short and high, 

 the mesonotum convex, pollinose with loosely scattered, 

 fine setae. There are 3 or 4 rows of rather fully dif- 

 ferentiated, acrostical setae. Doreocentral bristles are 

 present over the middle but are short and include poste- 



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