TRACHEAT A 
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Gastrophilus equi, the horse-bot, lays its eggs on the hairs 
of the hips and legs, the horse licks these off, and the larvae 
hatch out in its stomach; the larvae are found from May to 
October hanging in clusters on the wall of the rectum. Hypo- 
derma bovis, the ox-bot, deposits its egg beneath the skin of 
cattle ; the larvae hatch out, and cause large hollow cysts to 
form around them; they he in these cysts with their stigmatic 
plate directed to the opening. estrus ovis, the sheep-bot, is 
said to be viviparous; the female deposits larvae alive in the 
nostril of the sheep, whence they make their way to the frontal 
sinuses. 
Family Muscipar.—This family, which is very extensive, 
includes the common house-fly and blue-bottle fly, etc. The 
antennae are three-jointed, and end in a bristle. The proboscis 
terminates in a fleshy bilobed process. The 
wings have four simple longitudinal veins. 
The abdomen has only five segments visible 
externally, but others are invaginated. The 
larvae are white, cylindrical, apodal maggots, 
with a posterior pair of spiracles, and some- 
times a prothoracic pair as well. 
Musca domestica and MM. vomitoria are the 
house and blue-bottle flies. The tsetse fly, 
which is so poisonous to cattle in South Fic. 211.—Glossinia 
Africa, is Glossinia morsitans. The Tachin- eo Chen Tee 
idae lay their eggs in caterpillars, within 
whose body their larvae are parasitic. Several species are 
stated to be viviparous. 
Orpver 8 HYMENOPTERA. 
CHARACTERISTICS.—Insects with biting and licking mouth ap- 
pendages. The prothorax is fused with the mesothorax. 
The four wings are membranous, with few nervures, the 
hind wing on each side bears a row of hooks, by means of 
which it is hooked to the anterior wing, and the two move 
together. The metamorphosis is complete. 
The Hymenoptera include the ants, bees, and wasps, 
insects which, with regard to their social habits and instincts, 
