
A CHAPTER ON FLIES. 595 
skin of the arm, legs and abdomen. It is still under dis- 
_ pute whether this human bot-fly is a true or accidental para- 
_ site, the more probable opinion being that its proper host 
is the monkey, or dog. In Cayenne, this revolting grub is 
called the Ver macaque (Pl. 12, fig. 11); in Para, Ura; in 
Costa Rica, Torcel; and in New Grenada, Gusano peludo, or 
= Nuche. The Dermatobia notialis, supposed to be the Ver 
moyocuil of the inhabitants of Mexico and New Grenada, 
lives beneath the skin of the dog. 
The Bot-fly of the horse, G‘astrophilus equi (Pl. 12, fig. 
12; from Tenney’s Zodlogy; a, larva), is pale yellowish, 
spotted with red, with short, grayish, yellow hairs, and the 
wings are banded with reddish. She lays her eggs upon the 
knees of the horse. They are conveyed into the stomach, 
where the larva lives from May until October, and when 
full grown are found hanging by their mouth-hooks on the 
edges of the rectum of the horse, whence they are carried 
out in the excrement. The pupa state lasts for thirty or 
forty days, and the perfect fly appears the next season, from 
June until October. 
The Bot-fly of the ox, Hypoderma bovis (Pl. 12, fig. 13; 
fig. 14, larva), is black and densely hairy, and the thorax is 
banded with yellow and white..»The larva. is found during 
the month of May, and also in summer, living in tumors on 
: the back of cattle. When fully. grown, which is generally in 
_ duly, they make their way out and fall to the ground, and 
live in the puparium from twenty-six to thirty days, the fly 
appearing from May until September. It is found all over 
the world, The Gstrus ovis, the sheep Bot-fly, is of a dirty 
8h color. The’ abdomen is marbled with y ellowish and 
White flecks, and is hairy at the end. The larva lives, durmg 
April, May and June, in the frontal sinus of the sheep, and 
also in the: nasal cavity, whence they fall to the ground when 
full grown. In twenty-four hours they change to pup®, and 
‘the fly appears during the summers: = © © 
We also figure the Cuterebra buccata (PI. 12, fig. 155 a, 

