No. 4.J Rep tints. 232 



ing paragraph from Professor Verrill's report would seem to indicate 

 an acquaintance with specimens collected in this country: — 



The Gastrophilus pecorum is densely covered with yellow hairs, with a band 

 of black hairs on the thorax behind the suture in the male. The female is yellow* 

 ish brown, the abdomen black, with yellowish hairs at its base, as well as on 

 t^-e thorax. The wings are grayish or light brownish, clouded with yellowish 

 brown. The larvae are similar to those of the more common G. equi, and have 

 ■similar habits. The flies appear at the same time. 



Ostan Sacken's List of American Diptera records it only from 

 Jamaica on the authority of Walker, 



4. HORSE BOT-FLY OR "CHIN FLY." 



(Gastrophilus nasalis, Linn.) ■ 



As already stated, this species has been more or less confused 

 with equi in scientific writings, and doubtless still more so in general 

 observation, 



It was described as Qlslrus nasalis by Linnaeus {Fauna Suec ) 

 and it was also given the name of veteriniis by Clark, It was included 

 by Fabricius with hasmorrhoidalis under Gistrus equi. The descrip- 

 tion in Systema Naturae (Turton's translation) is as follows : — 



Wings immaculate, body ferruginous, sides of the thorax and base of the 

 abdomen with white hairs. Deposits its eggs on horses and cattle, the larvae 

 probably pass through the stomach like the former one- 

 Less than OEstrtis equi Insertion of the wings and base of the abdomen 

 covered with whitish hairs ; second segment of the abdomen with two hairy 

 tubercles. Beneath and legs rusty brown. Female with sometimes a blackish 

 abdomen. 



Of this species Verriil writes .(Ext. and Int. Parasites, p, 28) : — 

 The Gastrophilus nasalis is a smaller species, dense'y hairy, with the 

 thorax \ellowish red or rust - coloured. The abdomen is cither whitish at base 

 with the middle black and the apex yellowish brown and hairy; or the base is 

 whitish and all the rest brown ; or the middle is black, r-jith the base ard apex 

 whitish, with grayish hairs.. The wings are unspotted. The larv^ are much 

 like those of the preceding (hsmorrhoidalis), except that they are smaller, and 

 also live in the stomach of horses. They change to pupae beneath the manure 

 and the flies appear from June to September. It also infests the ass and mule 

 and some authors say that it lives even in cattle. 



Zuru^ ascribes this parasite to horses, asses, mules and goats, and 

 says the eggs, i mm. long, are laid on the lips and margin of nostrils. 

 He describes the full-grown larva as 13 to 14 mm. long, deep yellow 



* Die tierischeu Parasiten, p, 100, 



