274 (ESTRID^E. 



and more or less longer, recurved beneath ; ventral segments nearly as 

 broad as the dorsal. Legs of moderate length and thickness ; femora 

 hairy; tibiae and tarsi pubescent; ungues and onychia rather long. 

 Male. Discal transverse vein in a line with the praebrachial transverse. 

 Fern. Discal transverse vein parted by less than half its length from the 

 pra3brachial transverse. Tip of the abdomen attenuated, recurved, and 

 applied to the underside when at rest. 



1. Equi, F. S. A. 228. 4 (1792); Fischer; Lea, ; Latr. ; Clark; 

 Fal. ; Meig.; Mcq. ; Zett. ; Guer. Boms, L. ; F. Sp. I.; Hbst. ; 

 Schr. intestinalis, D. G. vituli, F. E. S. hcemorrhoidalis, Gmel. 

 Piceo-fulvus vel piceus, testaceo vel fuscescente hirtus, antennis piceis, 

 alls albidis cinereo-bifasciatis, halteribus pedibusque testaceis, tibiis apice 

 tarsisque nonnunquam piceis. Long. 5-8 ; alar. 11-12 lin. 



Body tawny, clothed with testaceous hairs. Head testaceous be- 

 neath. Antenna3 piceous. Disc of the thorax piceous. Wings dingy 

 whitish ; a transverse band beyond the middle and tips grey ; veins and 

 halteres testaceous. Legs testaceous. Male. Discal transverse vein in 

 a line with the prsebrachial transverse. Fern. Discal transverse vein 

 parted by less than half its length from the prasbrachial transverse. 

 Abdomen black towards the tip. Var. /3. Abdomen ferruginous ; sides 

 partly piceous. Var. y. Body piceous, clothed with brownish hairs. 

 Tarsi and tips of the tibiaa piceous. 



" Deposits its eggs on the hairs of such parts of the body as 

 tbe horse can reach with its tongue, and the eggs are thus con- 

 veyed into the stomach. Tbe larva has no communication at all 

 with the external air, breathing that which is received into the 

 stomach, and has respiratory plates at both ends of the body. It 

 has eight longitudinal tracheae, six arranged in a circle and two 

 minute ones, which appear to terminate in a pair of external 

 spiracles in the neck. The other (Estrida have only a pair of 

 tracheae." Generally distributed. (E. S. I.) 



2. hsemorrhoidalis, L. Fn. 1733 (1761) ; F. S. A. ; Fal. ; Clark ; 

 Meig. ; Mcq. ; Zett. Bovis, Gmel. Equi var., F. E. S. Nigro-piceus, 

 testaceo-hirtus, capite fulvo, antennis piceo-ferrugineis, alis sordide hya- 

 linis, venis halteribusque testaceis, abdomine medio nigro-hirto apice 

 luteo-hirto, pedibus testaceis, femoribus piceo-vittatis. Long. 4^-5 ; 

 alar. 9-10 lin. 



Body rather slender, piceous black, clothed with testaceous hairs. 

 Head tawny; vertex piceous. Antennae ferruginous, piceous above; 

 arista black. Scutellum ferruginous. Wings dingy hyaline ; veins and 

 halteres testaceous; discal transverse vein parted by more than its 

 length from the prabrachial transverse. Abdomen clothed with testa- 

 ceous hairs towards the base, with short black hairs in the middle, and 

 with orange hairs towards the tip. Legs testaceous ; femora with piceous 

 stripes. Yar. . Abdomen tawny towards the base. 



