$Gnaphosa conspersa.$--Half an inch long and rusty black in color. In alcohol the legs and cephalothorax are dark reddish brown and the abdomen gray. The whole body is covered with fine black hairs. The cephalothorax and abdomen are about the same size and a little flattened. The legs are stout and all nearly the same length. The upper row of eyes is nearly straight and the lateral eyes much farther from the middle pair than these are from each other (fig. 3). The middle eyes are oval and oblique, diverging toward the front. The maxillæ are large, and rounded on the outer corners. The mandibles are large and strong, with a wide, flat, serrated tooth (fig. 5) under the claw. The cocoon is white and flat, with a diameter as great as the length of the spider. The female, as far as I have observed, makes no nest, but partly lines with silk a shallow hole, in which she nurses her cocoon. It lives under stones and leaves as far north as the White Mountains and west to the Rocky Mountains in British Columbia, and on the Pacific coast in Oregon. A smaller and similar species, _Gnaphosa brumalis_, lives on the top of Mount Washington and as far north as Labrador. $Pythonissa imbecilla.$--About quarter of an inch long, bright orange brown on the cephalothorax and legs and blue black on the abdomen, with a few white hairs around the muscular spots. The legs are covered with fine long hairs a little darker in color than the skin. The cephalothorax is wide behind and more narrowed in front than in Gnaphosa. The eyes (fig. 6) are close together, and the lateral eyes of both rows are larger than the middle pairs and a little farther back on the head. The maxillæ (fig. 8) are short and wide, and bent toward each other so that they nearly meet in front of the labium. The front edges are nearly straight and the outer corners only slightly rounded. The sternum is wide and almost circular. The tarsus of the female palpi tapers from the base to the tip. [Illustration: FIGS. 6, 7, 8. Pythonissa imbecilla.--7, female enlarged four times. 6, the eyes seen from in front. 8, the maxillæ, labium, and ends of mandibles from below.] [Illustration: FIGS. 9, 10, 11. Pœcilochroa variegata.--11, female enlarged four times. 9, eyes from in front. 10, maxillæ, labium, and ends of mandibles from below.]