22 PLATE CCLXI. 



that number in either of his Entomological Syftems. A fifth fpecies 

 is defcribed by Gmelin in the laft edition of the Syftema Naturas, 

 under the name of Uralenfis*. The fpecies in the Entomologia 

 Syftematica of Fabricius, are Equina, Avlcularia, Hirundims, and Lo- 

 vina. The firfl: is rather larger than the others, and is well known by 

 the common name of Horfe Fly, becaufe it frequently molefts thofe 

 animals, and attaching itfelf to their bodies, penetrates the Ikin, and 

 fucks their blood. The three other fpecies are alfo natives of this 

 country, and like the H. equina, fubfifts on the blood of certain ani- 

 mals. The H. avicularia is found chiefly on the bodies of birds, and H. 

 hirudinis more efpecially on fwallows. Thefe creatures are all of a 

 difgufting form, flat, and hard: they adhere very tenacioufly by 

 means of the nails or crotchets of their talons, which in this genus 

 are numerous ; and are not eafily killed by preffure. The H. 

 equina has three fharp incurvated nails to each foot, the H. hirun- 

 dinis is furnifhed with twice that number on each. 



F I G. 11. 



HIPPO BOSCA AVICULARIA. 



SPECIFIC CHARACTER 



AND 



STNONTMS, 

 Wings obtufe. Thorax without fpots, and of one colour. 



* Hippobofca uralenfis: atra hirfuta dorfo ordinibus tribus veficularum albarum 

 ixitentium. Lepechin it. 1. t. 19. f. 9. habitat in dejerto Uraknft, 



HiPPOBOSCA 



