Asilidx from Aden and its neighbourhood. 91 



third joint as long as the preceding joints together, attenuated 

 towards the base. Proboscis shining black ; palpi rufous. Thorax 

 and scutellum cinereous, with a short whitish pilosity ; the bristles 

 before the halteres white. Abdomen in the male cinereous, at the 

 sides whitish ; in some lights the front borders of the segments 

 become darker and the hind borders lighter ; male genitalia rufous,, 

 with yellow hairs. The abdomen of the female has a more rufous 

 ground-colour, which, however, in well-preserved specimens is very 

 inconspicuous owing to the whitish pilosity ; sometimes the seg- 

 ments appear with a brownish-rufous front border and a white hind 

 border ; the ovipositor is very small. In both sexes some yellow 

 bristles are present on the sides of the first segment. Legs yellowish- 

 rufous ; in the male the femora on the upperside and the apical half 

 of the hind tibiae are brown ; hind femora slightly incrassated, 

 without spines on the underside, but with weak yellow bristles such 

 as are generally to be found all over the legs ; foot-claws black. 

 Halteres yellow. Wings hyaline ; neuration as in the preceding, 

 species. 



Five specimens (2 ^ , 3 $ ) from Shaik Othman. 



16. Dasythrix rujicornis, n. sp. ^ ^ . 



Grey ; clothed with white and greyish hairs ; abdominal segments 

 with blackish hind borders ; antennae rufous ; legs black. 



Length 1L5 mm. 



Head wholly and densely clothed with white hairs, which are 

 longer and more bristly towards the oral margin. Antennae 

 yellowish-rufous ; first joint beneath with long whitish hairs ; second 

 joint small, often somewhat infuscated ; third joint as long as the 

 first, elliptical ; the very short terminal style black. Proboscis 

 shining black ; palpi rufous, with white bristles. Ground-colour of 

 the thorax and scutellum black, but on account of the dense 

 covering of whitish hairs they have a grey aspect ; on the hind 

 margin of the latter these hairs become long erect bristles. Abdomen 

 conical, blackish-brown, clothed on the sides and front borders of 

 the segments with whitish hairs, so that large spots or cross-bands of 

 the dark colour remain on the hind borders ; the male genitalia and 

 the ovipositor of the female small and covered with whitish hairs. 

 Legs black, with white hairs and bristles, which are present also on 

 the tarsi ; in some specimens the base of the tibicB is slightly rufous ; 

 foot-claws black, with a rufous base ; pulvilli pale yellow. Halteres 

 yellowish-rufous. Wings (PI. Ill, fig. 3) hyaline with a slight 

 yellowish-grey tinge and with all the veins black except the auxiliary 



