$Prosthesima ecclesiastica.$--Black, with white markings along the middle of the back. One-third of an inch long, a little larger than _P. atra_ and smaller than _Gnaphosa conspersa_. The cephalothorax is proportionally longer and narrower and the sternum narrower and less round than in _P. atra_ (fig. 18). The cephalothorax is dull black at the sides, with a whitish stripe in the middle. The legs are also dull black and, like the cephalothorax, turn brown in alcohol. The abdomen is black, with a bright white stripe in the middle that extends from the front end about two-thirds its length; and at the hinder end, just over the spinnerets, is another white mark (fig. 17). The under side of the abdomen is dark at the sides and light in the middle. The eyes and maxillæ are as in _P. atra_, the maxillæ a little less rounded at the ends. [Illustration: FIG. 19. Drassus saccatus.--Female enlarged three times. For eyes and mouth parts see figs. 1 and 2 in Introduction.] $Drassus saccatus.$--Four-fifths of an inch long, and pale, without markings. The head is shorter and wider than in _Gnaphosa conspersa_ and _Prosthesima atra_, and the eyes cover a larger part of the head. Both rows of eyes (figs. 2, 19) are curved, with the middle highest. The middle upper pair are oval and turned apart toward the front. The lateral eyes are twice their diameter from the middle pair. The maxillæ (fig. 1) are widened at the ends on both sides. The labium is as wide as it is long, narrowed toward the end but truncated at the tip. The color is light gray, with short fine hairs all over the body. The front of the head, the feet, and the mandibles and maxillæ are darker and browner. The abdomen is marked only with the usual four muscular spots and sometimes a few transverse dark markings toward the hinder end. The legs are long and tapering in both sexes. The male is smaller and more slender than the female, and the male palpi are long, with the end very little enlarged. They live under stones, and make a large transparent bag of silk in which the female makes her cocoon of eggs, and stays with it until the young come out. Early in the summer a male and female often live together in the nest, even before the female is mature. [Illustration: FIGS. 20, 21, 22. Geotrecha crocata.--22, female enlarged four times. 20, eyes seen from in front. 21, maxillæ, labium, and ends of mandibles from below.]