Anyphæna saltabunda.—A pale short spider, with long and slender legs [(fig. 46)]. The body is an eighth to a sixth of an inch long. The abdomen is oval, two-thirds as wide as long, and nearly as high as it is wide. The cephalothorax is three-fourths as wide as long, widest across the dorsal groove and narrowing gradually to half as wide in front. The eyes of the upper row are twice as large as those of the front row. The first legs are longest in both sexes, measuring in the female over twice the length of the body and in the males three times. The spines are very long on the legs and palpi but only a little darker in color. The general color is pale yellow or white, with two broken gray stripes on the cephalothorax and two middle and several lateral rows of light gray spots on the abdomen. The spinnerets are slender and two-jointed. The opening of the air-tubes is halfway between the spinnerets and the epigynum. The palpi of the male [(fig. 47)] are long and slender, and the tibia is slightly curved and has a large thin process on the outer side.

THE GENUS CLUBIONA

These spiders are all pale and most of them without markings. The eyes are close to the front edge of the head and cover more than half its width (figs. [50], [54], [56]). The upper row is longer and the eyes larger and the middle pair farthest apart. The distance between this pair varies according to the species. In crassipalpis and canadensis it is little more than that between the middle and lateral eyes, while in rubra it is nearly twice as great. The mandibles of the females are swelled at the base in front, and this swelling is greatest in canadensis [(fig. 55)]. The mandibles of the males are longer and are shaped in a variety of ways according to the species. The shape of the epigynum is indistinct and variable, and females of different species are difficult to distinguish. The females of ornata and excepta are known by their markings and those of rubra by their size and resemblance to the male. The females of crassipalpis and tibialis are doubtful. The palpal organs and male palpi are of great variety and distinguish the males of all species without much difficulty.

The Clubionas live in flat tubes of silk on leaves of low plants in summer and under bark and stones at all seasons.

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.