$Clubiona crassipalpis.$--A quarter of an inch long and pale, without markings. The head is sometimes a little darker than the rest of the body, and the mandibles and ends of the male palpi are always darker. The eyes of the upper row are almost equidistant, the middle pair only a little farther apart than they are from the lateral eyes. The mandibles of the male (figs. 49, 50) are elongated as usual, narrowed toward the end, and thickened in front just above the middle. On the outer side in front is a sharp ridge that extends from the base of the claw halfway up the mandible. The inner edges of the mandibles are thin and inclined backward toward the mouth, but there is no line or ridge between the thick and thin portions as in some other species. The palpi of the male (fig. 51) have the patella and tibia both short. The tibia is widened on the outer side and laps over the tarsus, extending in a blunt hook for half its length. [Illustration: FIGS. 49, 50, 51, 52. Clubiona crassipalpis.--49, head and mandibles of male from the left side. 50, head and mandibles of male from in front. 51, palpus of male. 52, maxillæ, labium, and ends of mandibles.] [Illustration: FIGS. 53, 54. Clubiona tibialis.--53, end of palpus of male, showing large tibia. 54, head and mandibles of male.] $Clubiona tibialis.$--Quarter of an inch long, the same size and color as _crassipalpis_, with no markings and no dark color except on the mandibles and male palpi. The middle eyes are a little farther apart than in _crassipalpis_. The male mandibles (fig. 54) are narrower than in _crassipalpis_ and without the sharp ridge on the outer side, but on the inside they are sharply hollowed out with a ridge between the thick outer and thin inner portions. The male palpi (fig. 53) have the patella about as long as wide, as it is in _crassipalpis_ and _canadensis_, but the tibia is very large, with a hook in the usual place on the outer side and a much larger process, which extends forward over the tarsus. The tarsus is long and thickened in the middle where it rests against the process of the tibia. [Illustration: FIGS. 55, 56, 57. Clubiona canadensis.--55, head of female, showing the swelled mandibles. 56, head and mandibles of male. 57, palpus of male.]