[Illustration: FIGS. 213, 214. Dolomedes tenebrosus.--213, female enlarged twice. 214, front of head.] [Illustration: FIGS. 215, 216. Ocyale undata.--215, female enlarged twice. 216, front of head.] [Illustration: FIG. 217. Nest of the young of Ocyale undata in a wild-rose bush. One-third the real size.] $Dolomedes tenebrosus.$--This is one of our largest spiders, spreading its legs over four inches. The color is light and dark gray. The legs are indistinctly marked with light and dark rings and have long dark spines (fig. 213). The thorax is dark in the middle and lighter toward the eyes. On each side are light bands that extend around under the eyes and meet in front. The abdomen has three pairs of transverse dark stripes, each with a light border on the hinder edge. The cephalothorax is four-tenths of an inch long and three-tenths wide, half as wide in front, and nearly straight on the front edge. It is rounded in the middle, but not very high, and just behind the eyes is nearly flat. The under side of the thorax and legs is light colored, without markings, the abdomen a little darker. The abdomen is as long as the thorax, widest across the middle, and a little pointed behind. The male has longer legs and is more slender and strongly marked; under the fourth femora near the end is a bunch of stiff hairs. The male palpi are long, with large tarsi and palpal organs and a long hook on the outer side of the tarsus. They live near water, on the ground or low bushes. The female carries her cocoon in her mandibles and makes a large bunch of silk in the bushes, in which the young live for some time after hatching. $Ocyale undata.$--When full grown over half an inch long, the thorax quarter of an inch, and the first and fourth legs an inch long. The thorax is almost as wide as long, and the head not much more than half as wide (fig. 215). The abdomen is long and narrower than the thorax and a little pointed behind. The color is a light brownish yellow, with a wide darker and browner band on the middle of both thorax and abdomen. This band is bordered by a white line a little curved in and out toward the tail. In younger spiders the color is lighter and yellower; the middle stripe has the edges more undulating, and in very young ones it is serrated or even broken up into spots. The legs, which are plain in adults, are sometimes marked with rings in the young. The front end of the stripe is sometimes divided into two. These spiders live on bushes, without any web, until they have young. In the latter part of summer the females carry their flat cocoons under them, holding on with the mandibles. When the young are about to hatch the female builds a mass of web (fig. 217) three or four inches through, in which she leaves the cocoon, and the young come out and live for a time together in the web. [Illustration: FIGS. 218, 219. Oxyopes salticus.--218, female enlarged six times. 219, front of head.]