288 INSECTA. 
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 Céstri, but of a different species. 
CE. ovis, L.; Clarck, Lin. Trans., III, 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 larva inhabits the frontal sinus of the Sheep. That of 
the species called frompe, Fab., is found in the same parts in 
the Rein-Deer. 
CE. 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 larve inhabit their stomach. 
CE. 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 
larve live in their stomach. 
CE. 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 Conopsaria€, 
is the only one of that family in which the proboscis is either 
always salient and siphoniform, cylindrical or conical, or seta- 
ceous. The reticulation 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 
