392 ARACHNIDA—ARANEAE CHAP. 
is not represented in this country, but one species, / testacea, has 
an extremely wide distribution in the Old World, while /. capitata 
extends throughout the American continent. 
The calamistrum of the female is short, only occupying a 
portion of the metatarsus of the fourth leg. The cribellum is 
divided, These spiders weave a web of close texture, of an 
irregular tubular form. 
Fam. 5. Oecobiidae (Urocteidae)—Two very remarkable 
genera constitute this family, Oecobius and Uroctea. 
The species of Oecobius, about fifteen in number, are small 
spiders, inhabiting subtropical countries—and especially desert 
regions—and spinning a slight web under stones, or in holes in 
Fic, 204.—A, Oecobius maculatus, much enlarged ; B, Uroctea durandi, 
slightly enlarged. (After Simon. ) 
walls. The female possesses a small transverse cribellum, the two 
halves of which are widely separated. The calamistrum is but 
feebly developed. No example has occurred in this country, but 
nine species have been described in the Mediterranean region. 
The three species of Uroctea are rather large spiders, two being 
native to Africa, while the third inhabits China and Japan. They 
are ecribellate. These two genera very closely resemble each 
other, not only superficially, but in certain structural details— 
notably the remarkably developed and two-jointed anal tubercle— 
and their close affinity supples the strongest argument against 
separating the spiders which possess cribellum and calamistrum 
into a group by themselves. In both genera the cephalothorax 
is very broad and rounded at the sides. The eight eyes are 
compactly arranged. The sternum is broad and_ heart-shaped. 
