HIPPOBOSCA STKUTHIONIS. 57 



very smooth, shining black, and narrowly bordered with 

 yellow behind ; the clypeus is pale yellow, with the 

 centre and margins brownish ; it is deeply notched in 

 front, broadly rounded behind, and has a deep central 

 impression near the base ; the antennae are black, with 

 brown setae ; the proboscis black, with long grey setae ; 

 eyes pale brown. The thorax is deep shining black, 

 with fourteen small yellow spots ; it is very feebly and 

 irregularly striated on the disk, but more distinctly so 

 at the sides ; there are two slight impressions in front, 

 and a deep, transversely striated, depression behind. 

 The scutellnm is shining black, with a triangular pale 

 yellow spot in the centre ; there are some long grey setae 

 on the hind margin, and in some specimens there is an 

 additional small yellow spot on each side. The abdomen 

 is finely granulate, dull black, with long grey hairs. 

 The underside and legs are black or pitchy-black, with 

 long grey hairs ; the knees and tarsi are pitchy-red ; the 

 underside of the anterior femora are yellow at the base, 

 and there is a yellow or reddish yellow spot in the middle 

 of all the tibiae. The wings are pale brownish hyaline, 

 with the veins pitchy-red or nearly black. The expanse 

 of the wings is 16 18 millm. 



As this species was found to differ from all others 

 existing in accessible collections, and not to agree with 

 any published description, specimens were submitted to 

 Mons. Bigot, of Paris, an eminent authority on the 

 Diptera, and he, after a careful examination, pronounces 

 it to be a species hitherto undescribed. 



It is somewhat remarkable that this fly should have 

 escaped observation until quite recently, and prove to be 

 a species apparently unknown to naturalists, as it is 

 said to have been found in great abundance in the 

 district in which it occurs. 



Another species of these flies (Hippobosca rufipes, 

 Wied.*) has been recorded as occurring on the wild 

 ostrich many years since, but, according to the observa- 

 tions of Lichtenstein during his travels in South Africa, 



* Aussereurop. Zweiflugl. Insecten,' vol. ii. p. 604 (1830). 



