Asilidie from Aden and its neighhoitrhood. 95 



laterally with blackish spots, one before and another behind the 

 transverse suture ; the thoracic dorsum with short black hairs, 

 posteriorly and on each side before the root of the wings with 

 several black bristles. Pleurae grey ; scutellum with yellowish 

 hairs ; its hind margin with a row of yellowish bristles. Abdomen 

 elongate, narrower than the thorax, each segment with two blackish- 

 brown spots, which in some lights appear to be united, forming 

 dark front borders on the segments ; laterally there are some 

 yellowish bristles ; on the eighth segment these bristles are black ; 

 genitalia ovate, piceous. Coxae greyish-cinereous ; femora blackish 

 above, rufous at the underside ; tibiae rufous with brownish tip ; 

 tarsi brownish ; the legs are clothed with short, whitish hairs, on 

 the fore coxae and on the underside of the fore femora these hairs 

 become longer and more bristly ; tibiae with scattered, mostly black 

 bristles ; those on the innerside of the fore tibiae are yellowish ; the 

 bristles of the tarsi black, some only on the fore tarsi pale ; foot-claws 

 black ; pulvilli yellow. Halteres yellow. Wings (PI. Ill, fig. 7) 

 hyaline, with black veins ; the upperbranch of the third vein has a 

 short recurrent stump at the base ; the first posterior cell is slightly 

 narrowed at the tip, but not closed ; the small cross-vein is situated 

 a little before the middle of the discal cell. 



A single male specimen from Shaik Othman. 



21. Protophanes costalis, n. sp. $ . 



Cinereous ; thorax with a black stripe ; abdomen with black dorsal 

 spots ; mystax white ; antennae and legs black ; wings with a narrow 

 brown costal border. 



Length 12.5 mm. 



Head (PI. Ill, fig. 8) broader than the thorax ; face narrow, not 

 prominent, wholly covered by the large white mystax, in the upper 

 part of which, under the antennae, some black bristles are mixed ; 

 front black, with black bristles, those on the vertex rather long, 

 curved forward ; beard white. Antennae black ; the basal joints with 

 whitish bristles beneath and some black ones above ; third joint as 

 long as the basal joints together, but distinctly narrower, and 

 gradually passing into the rather short and thick arista. Proboscis 

 black, pointed towards the tip. Thorax cinereous, with a very 

 distinct black dorsal stripe ; the usual lateral stripes inconspicuous ; 

 thoracic dorsum with short black hairs and along the median stripe 

 with black bristles, which posteriorly are intermixed with whitish 

 hairs ; pleurae grey ; the bristly hairs before the halteres, whitish. 



