PARASITES AFFECTING THE SKIN 45 
There are hundreds of species, of which may be men- 
tioned : 
The Autumnal Breeze-Fly.—18 to 20 millimetres long. 
Thorax grey, with four brown longitudinal bands ; 
abdomen with three rows of white spots ; legs yellowish- 
white. 
The Ox Breeze-Fly.—A very large fly, 27 millimetres 
long. Thorax covered with yellow hairs, with black 
longitudinal bands; abdomen brownish, striped with 
fawn. Each ring bears on the middle of its dorsal 
surface a white spot. 
Allied are the Hematopota, of which may be men- 
tioned the small rain breeze-fly (H@matopota pluvialis). 
2. Muscide (House-Flies.) 
These have a large number of genera and species. 
Two groups are parasitic during the larval stage: 
(x) Sarcophaga ; (2) Lucilia. 
The following are parasitic (blood-suckers) during 
adult life : 
I) Stomoxys. 
2) Glossina (tsé-tsé). 
) Hamatobia. 
(4) Muscidz. 
(5) Cstride. 
(6) Hippoboscide. 
Stomoxys Calcitrans much resembles an ordinary house- 
fly, but its head bears an elongated proboscis, extending 
far in front. 
It attaches itself usually to the legs or neck of a horse, 
and can only with difficulty be knocked off. It causes 
great irritation, and in fine-skinned horses the attack 
gives rise to a papule. 
Glossina Morsitans (Tsé-tsé Fly)—Similar in appear- 
ance to a house-fly. Proboscis very long and slender ; 
