THE SPIDEitS, 
116 
The male spider is usually mucli smaller than the fe- 
male; the latter lay their eggs in silken cocoons. The 
tarantula {Lycosa) usually lives in holes in the ground, and 
sometimes conceals the opening by covering it with a few 
dead leaves. The common garden spider is Epeira vulga- 
Fia. 139 — Mygale, Trap-door Spider. 
vis. It lives about houses and in gardens; its geometrical 
web is very regular. The large trap-door spider {Mygale) 
has four lung-sacs instead of two, as in the other spiders, 
and only two pairs of spinnerets. Mygale Hentzii (Fig. 
139) inhabits the Western plains and Utah; the gigantic 
