zz PLATE CCIXI. 



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 

 Systematica of Fabricius, are Equina, Avicularia, Hirundinis, and £o~ 

 vina. The firft 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 fkin, and 

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

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

 mals. The H. avicularia is found chiefly on the bpdies 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 ol 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, and H. hirurj- 

 dinis is furnifhed with twice that number on each. 



FIG. II, 

 HIPPOBOSCA AVICULARIA, 



SPECIFIC CHARACTER 



AND 



SYNONYMS, 



Wings qbtufe : Thorax of one colour. 



* Hippobofca Uralenfis: atra hirfuta dorfo ordinibus tribus veficularum albarum 

 uitenti'um. Lepechin it. i. t. 19. f. 9. babi'ai In defer to Uralenji. 



Hlpp.OBOSCA 



