THE GENUS PARDOSA

Pardosa consists of comparatively small spiders, all of them long legged and slender. The head is high in front, and the four upper eyes large and spread over the whole front of the head [(fig. 200)]. The front row of eyes is plainly shorter than the second row. The colors are generally dark, often black, and with white markings. The spines of the legs are long, even on the front pairs, and the whole body is often covered with long hairs. To show the comparative size of the different species of this genus, all the figures are made on the same scale, four times the real size.

Pardosa lapidicina.—Four-fifths of an inch long and with long legs, the fourth pair three-quarters of an inch long. The color is black, the whole body being covered with black hairs that obscure the few light markings [(fig. 186)]. When looked at closely, especially after being wet, the legs appear a little lighter colored toward the ends, and the femora faintly marked with light rings. In the middle of the cephalothorax there is a large light spot, widest just in front of the dorsal groove, and at the sides are rows of irregular light spots. On the abdomen are three or four pairs of light spots near together in the front half, and behind are two rows of spots meeting over the spinnerets. On the under side the color is a lighter gray than on the back. The color, as in all spiders, varies according to age, the young and freshly molted having a deeper black color, while older ones are gray. The epigynum is shown in the figure [(fig. 188)], and is quite constant in shape. It distinguishes this species from greenlandica [(fig. 189)], for which it is most likely to be mistaken. The male differs little from the female. This spider lives among gray stones in the hottest and driest places from Connecticut to Labrador.

Pardosa albomaculata or greenlandica.—This species resembles lapidicina [(fig. 186)], but is a little larger and not quite as long legged. It has longer hairs and is marked with bright white spots on a black ground. There are two rows of white spots on the abdomen, and others along the sides of the cephalothorax and on the legs [(fig. 189)]. Wet in alcohol it shows similar irregular markings on the abdomen as lapidicina, but the light spots on the thorax are smaller, the middle one extending forward only to the dorsal groove. The epigynum [(fig. 190)] is large and distinct. Its outline has been compared to that of a decanter, narrow in front and rounded out at the sides behind. There is a long narrow middle lobe, generally widened at the end, but varying much in shape. At the front end of the epigynum are two small depressions. It resembles the epigynum of glacialis [(fig. 192)], but is always longer and narrower and has the middle lobe straighter and more distinct. White Mountains, on bare stones. Rocky Mountains, Canada, and Greenland.

Pardosa glacialis or brunnea.—One-third of an inch long. Color dark brown with some light markings. In the middle of the cephalothorax is a light stripe, widening and fading out toward the eyes and divided by a dark middle line, widest in front and extending back as far as the dorsal groove [(fig. 191)]. On each side is a light stripe extending under the eyes to the front of the head. The abdomen has the middle pointed stripe light colored, and sometimes there are four or five pairs of small spots of white hairs on the hinder half. In alcohol there are obscure cross markings and black spots. The legs are marked with longitudinal dark and light lines. On the under side there is usually a light middle stripe on the front of the sternum, and the middle of the abdomen is lighter than the rest. The whole body is hairy; there are long black hairs on the front of the head, and the spines are long and colored like the legs. The epigynum [(fig. 192)] has a narrow middle lobe transparent at the end so that it is difficult to see, and dark brown pieces at the sides, with the outer ends turned forward. The shape can best be understood from the figure. The epigynum varies, but distinguishes this species plainly from greenlandica [(fig. 190)], with which it is likely to be associated. The male palpi are large and black at the ends, the tarsus oval and pointed, and the tibia short and as thick as long. This spider has been found all over Canada and as far north as Greenland. It is common in the White Mountains and has been found as far south as Connecticut.

Pardosa tachypoda or montana.—This is a Canadian and White Mountain spider found as far south as Massachusetts [(fig. 193)]. It is smaller than either greenlandica or glacialis and larger than nigropalpis and albopatella. The colors are more like the last two species, but the legs are darker and more distinctly ringed. The light markings of the cephalothorax and abdomen are less distinct and more broken and irregular. The epigynum [(fig. 195)] has a characteristic shape different from any of the allied species, the two anterior depressions being wide apart and the middle ridge narrow and rounded at the end. The male palpi [(fig. 196)] are rather slender, as in lapidicina, and uniformly colored, and all the differences between the sexes are less strongly marked than in nigropalpis and albopatella.

Pardosa pallida.—One-fifth of an inch long and brightly marked with black and brown on a light yellow ground (figs. [197, 199]). The cephalothorax is narrower than in most species. The cephalothorax has two wide gray stripes and a fine black line on the edge at each side. The abdomen has the middle pointed stripe light brown with a broken black edge. On each side is a black band, made up of spots closer toward the middle and more scattered toward the sides. The legs are light yellow, with a few black spots near the body. The spines of the legs are long but not dark colored. On the under side there are dark spots on the sternum near the base of each leg, and sometimes two rows of spots or two bands nearer the middle. On the under side of the abdomen are two black stripes, sometimes connected behind. In the males [(fig. 199)] the colors are darker and the dark markings larger. The ends of the palpi are large and covered with black hairs.

In one freshly molted young male there was hardly any trace of the spots on the sternum. The male palpi were dark gray with black hairs, except the tarsus, which was light colored, with a dark spot in the middle and a few black hairs. The markings of the abdomen were very indistinct, and the light color brownish, while the thorax and legs are slightly green. The first femora were black toward the end.

Pardosa nigropalpis.—About quarter of an inch long. Black and gray. The male with head and palpi black [(fig. 203)]. In the female the cephalothorax has a large light middle stripe, widest between the eyes and the dorsal groove, and a narrow light stripe on each side [(fig. 202)]. The abdomen is light in the middle for its whole length in an irregular stripe partly divided by faint cross lines of gray. The sides are darker and spotted with black. The legs are faintly marked with darker rings. In the male the contrast between the light and dark markings is greater, the markings of the cephalothorax are smaller and brighter, and the head and palpi are black and covered with black hairs.

Pardosa albopatella.—Smaller than P. nigropalpis, but resembling it in shape and color (figs. [205, 206]). The middle stripe of the cephalothorax is narrower. The middle stripe of the abdomen is narrower and brighter at the front end. The femora are distinctly marked with four rings, and the other joints less plainly. In the male the ends of the legs are pale, without rings, and the rings of the femora are broken into spots except on the front legs, where the femora are black. The palpi [(fig. 206)] have the femora black and the patella white. The tibia is dark, and the tarsus is dark at the base and white toward the tip.

Pirata piraticus.—A small and active spider living in short grass in summer and under leaves in winter. The colors and shape of the body are much like Lycosa pratensis [(fig. 168)], but the legs are proportionally larger and longer, and the colors brighter. The length is about a quarter of an inch. The front and second rows of eyes are of the same length, those of the second row large and their diameter apart [(fig. 209)]. The eyes of the upper row are nearly as large as those of the second, and twice as far apart. The color is pale yellow, with gray or black markings. The cephalothorax has a narrow light line in the middle and one on each side [(fig. 208)]. In the middle of the front of the abdomen is a light stripe with dark edges, which tapers into a line or row of spots behind the middle. At the sides of this are light stripes that unite behind, and outside of these are dark markings becoming smaller behind. The legs have conspicuous dark spines, especially the hinder pair, and are faintly marked with rings or sometimes are without markings.

Dolomedes and Ocyale differ in many respects from the other Lycosidæ. They are more flattened, have the head lower, and the eyes all more nearly of the same size. The front row of eyes are small and near together. The upper row is about twice as long and strongly curved, and the eyes are nearly equal in size and twice as large as those of the front row (figs. [214, 216]). In Dolomedes the lower eyes are about half as high as the top of the head. In Ocyale they are lower and farther apart, and the head resembles still more Tibellus of the Thomisidæ. Both Ocyale and Dolomedes resemble this family in their flattened body and wide thorax.

Dolomedes sexpunctatus.—Dark greenish gray or, in young spiders, yellow, with a silvery white line each side the whole length of the body, meeting in front under the eyes and reaching back to the spinnerets [(fig. 210)]. In the middle of the cephalothorax is a narrow light line. On the hinder half of the abdomen are four pairs of small white spots, and sometimes another pair near the front end. On the under side the general color is lighter, and there are six dark spots on the sternum [(fig. 211)]. The cephalothorax is three-quarters as wide as long, but looks narrower on account of the white stripes. The abdomen is proportionally longer than in tenebrosus [(fig. 213)]. The full-grown female is six-tenths of an inch long, with a spread of an inch and three-quarters. In winter and spring the half-grown young are very common everywhere. It lives near water and runs easily on it, each foot making a depression on the surface without becoming wet.

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.

Oxyopes salticus.—The eyes are in three rows, the front one of two small eyes, the second of four eyes, and the upper of two. The head is wide and less separated from the thorax than in Lycosa and very high in front. The cephalothorax is two-thirds as wide as long and rounded both in front and behind [(fig. 218)]. The abdomen of the male is smaller than the cephalothorax, but that of the female is wider and longer. It is widest in the middle, rounded in front, and pointed behind. The legs are slender, the first pair longest, but all nearly of the same length and with very long spines. The colors and markings are very variable. The legs are white or pale yellow, with black spines. The light parts of the body are the same color, with brown and black markings. There are usually four brown stripes on the cephalothorax from the eyes backward, and two black lines in front from the lower eyes down the front of the mandibles [(fig. 219)]. The most constant mark of the abdomen is a pointed middle spot extending as far as the middle of the back. This is generally surrounded by light color, and at the sides are narrow oblique brown marks. There are sometimes fine black lines on the under sides of the femora and a wide black middle stripe under the abdomen. The males are sometimes colored like the female, and vary from this to black abdomen and palpi, with the rest of the body pale. A very common species in the southern states in the early summer, running on low bushes. There is another Oxyopes about the same size that has been found a few times as far north as New England.

Oxyopes (Peucetia) viridans.—This is a common and conspicuous spider in the South. It is a bright transparent green, with red spots and black spines. It grows to a length of three-quarters of an inch, but is found in great numbers early in the summer, when it is only a quarter of this size [(fig. 220)]. The head is narrower than in O. salticus, and the lateral eyes so high that they appear to belong to the upper rather than the middle row. The abdomen is the same width as the back part of the cephalothorax and tapers a little toward the spinnerets. The first pair of legs is longest and the second next. The general color is green, with the space between the eyes red, red spots and black spines on the legs, and two rows of red spots on the abdomen, sometimes united into a stripe, with pairs of white spots surrounded by red.