422 ZOOLOGY 
spin webs under leaves, in which whole colonies of the mites 
dwell. 
The Ixoprmpak or ticks are blood-sucking mites which live 
on undergrowth in forests; the females crawl upon man, 
! Fic. 243.—The same (Jzodes aegyptius) ; under side. 
a. Chelicerae. e, f. Maxillae and labium soldered 
6, Pedipalpi. together. 
c. Genital aperture. g. Sternum. 
d, Anal aperture. 1-7, Joints of leg. 
cattle, or even snakes, and attach themselves by their strong 
rostrum. They suck blood to such an extent that their bodies 
sometimes swell to the size of a small walnut. 
The TYROGLYPHIDAE include Tyroglyphus siro, the cheese 
or flour mite, and several other species which feed on vegetable 
substances. 
