Tuibe SENOCTJLINA. 
Family — DY SDERIDJ3. 
The Dysderidce occur in countries separated by wide intervals of sea, especially in 
longitude. Their falces are articulated either on an inclined plane or vertically; two 
branchial and two tracheal opercula occupy the usual situations on the inferior surface of the 
abdomen, which has three pairs of spinners at its extremity; and the tarsi are terminated 
by two claws and a scopula in some species, and in others, destitute of scopulae, by three 
claw's. 
Cells and tubes of silk constructed on the under side of stones, among lichens growing 
on trees, and in crevices in rocks and walls, constitute the retreats of the spiders of this 
family, which commonly take their prey by surprise. 
Genus —DYSDERA, Latr. 
Eyes closely grouped on the anterior part of the cephalo-thorax in the form of a small 
oval, open in front. 
Maxillae long, straight, and enlarged where the palpi are inserted. 
Lip of an elongated oval figure, somewhat hollowed, rounded, or truncated at the 
extremity. 
Legs moderately long, the anterior or the posterior pair being the longest, and the third 
pair the shortest. 
