DIPTERA. 359 
Q:. bovis, De Geer; Clarck., Lin. Trans., III, xiii, 1, 6. 
From six to seven lines in length, and densely pilose ; thorax 
yellow, with a black band; ahdomen white at base, with a ful- 
vous extremity ; wings somewhat obscure. 
The female deposits her eggs under the hide of healthy Oxen 
and Cows, of not more than two or three years of age. The 
consequence of this operation are tumours or lumps, on the in- 
ternal pus of which the larve feed. Horses also are subject to 
them. . 
The Rein-Deer, Antelope, Hare, &c., also nourish various 
larve of CEstri, but of a different species. 
d. ovis, L.; Clarck, Lin. Trans., 11], xxxii, 16,17. Five 
lines in length, and but slightly pilose; head greyish; thorax 
cinereous, with elevated black points; abdomen yellowish, finely 
spotted with brown or black; legs pale-brown; wings transpa- 
rent. 
The larvz inhabits the frontal sinus of the Sheep. That of 
the species called trompe, Fab., is found in the same parts in 
the Rein-Deer. 
C&. equi, Lat.; Clarck, Ibid., xxxiii, 8,9. But slightly pilose, 
and of a fulvous-brown; abdomen paler ; two points and a band 
on the wings, black. 
The female deposits her ova on the legs and shoulders of 
Horses; the larvee inhabit their stomach. 
G. hemorrhoidalis, L.; Clarck, Ibid., 12, 13. Densely pi- 
lose; thorax black, with a pale yellow scutellum; abdomen 
white at base, black in the middle, and fulvous at the end; wings 
immaculate. 
The female deposits her eggs on the lips of Horses, and the 
larvee live in their stomach. 
Gf. veterinus, Clarck, Ibid., 18, 19. Completely covered 
with russet hairs; those on the sides of the thorax and base of 
the abdomen, white ; wings immaculate. 
The larva inhabits the stomach and intestines of the same 
animal. It is possible that the female may deposit her ova on 
the margin of the anus. 
The third tribe of the Athericera, that of the Conopsari™, is the 
only one of that family in which the proboscis is either always salient 
and siphoniform, cylindrical or conical, or setaceous. The reticula- 
tion of the wings is the same as in our first division of the Muscides. 
Most of these Insects are found on plants. They form the genus 
Conops, Lin. 
In some the body is narrow and elongated, the abdomen clavate, 
curved underneath, and with the male organs of generation salient. 
The second joint of the antenne is at least almost as long as the 
