$Synemosyna formica.$--A small spider so much like an ant as to be often mistaken for one (fig. 163). It is about quarter of an inch long and very slender. The cephalothorax is narrowed behind and the abdomen in front, and each has a deep depression in the middle. The stem of the abdomen is flat, and widened behind so that it is nearly as wide as the ends of the thorax and abdomen, which it connects. The front middle eyes are large and cover two-thirds of the width of the front of the head, and the rest of the eyes are small. The legs are all slender, the hind pair longest. The general color is black, with yellowish or orange-white markings. There is a triangular white spot in front of the dorsal groove, and one on each side widening downward under the posterior eyes. On the abdomen there is a white stripe extending downward from the dorsal depression on each side and uniting in a large white patch underneath (fig. 164). In pale individuals the whole front half of the abdomen is light yellow or orange brown. The second legs are entirely white, the others partly black. The male has the head higher and is darker colored and more slender. This spider not only resembles an ant in form and color but moves like an ant. It does not jump like most Attidæ, though it can do so, but walks and runs irregularly about and lifts its first legs high like the antennæ of ants. [Illustration: FIG. 165. Lyssomanes viridis, enlarged six times.] $Lyssomanes viridis.$--A bright green spider common in the southern states. The arrangement of the eyes differs from that usual in the Attidæ by the front lateral eyes being higher and closer together, so that they are over and behind the front middle pair (fig. 165). The cephalothorax is narrow in front,--not much more than half as wide as it is across the middle. The abdomen is narrower than the thorax and more than twice as long as wide. The female is a third of an inch in length, and the male quarter of an inch. The legs are long and slender, the first pair longest and thickest, in the male half an inch in length and in the female a little shorter. In the female the mandibles are vertical and about as long as the height of the head. In the male they are as long as the cephalothorax, curved apart, and extended almost horizontally in front of the head. The color is light transparent green, sometimes without any markings. Usually there are four pairs of small black spots on the abdomen, and there are black spots around the eyes, except around the front pair, where there is a little orange color. They live on low bushes and mature early in the summer. THE LYCOSIDÆ