482 Wisconsin Academy of Sciences , Arts and Letters. 
white and rufus hairs which give a uniform gray tint, while the 
lower sides are black. In the female the hairs just above the 
front eyes are bright red, while those below, and on the clypeus, 
are white, but in the male the eye-brows are white and the cly¬ 
peus is covered with bright chestnut-colored hairs. The abdo¬ 
men has a wide angular gray band, bordered with black, down 
the middle, the sides being covered with gray and dark tawny 
hairs. The palpi are light reddish-brown covered with long 
white hairs, and the legs dark brown with short gray hairs. 
In the male, long white hairs hang down between the f alces, and 
partly cover their front faces. 
This species is common through the eastern, southern and 
middle states, and is found as far west as Salt Lake, Utah. It 
is also found in Mexico. In the far west its place is taken by 
californica. We consider rupicola H., from Florida, Alabama 
and Hew York, a variety of undata. It has more red inter¬ 
mixed with the gray, on the top of the cephalothorax and on the 
sides of the abdomen, and in the male the first legs are relatively 
longer. 
MARPISSA CALIFORNICA P. 1888. 
Plate XXXIX, figs. 2—2a. Plate XL, fig. 2. 
1888. Makptusa californica P. g $, Trans. Wis. Acad. Sciences, Arts 
and Letters, VII, N. A. Att., p. 81. 
1901. Marpissa minor g $, and melanura 5 , F. O. P. C., Biol. Cent. Am., 
Arach., Aran., II, pp. 250, 251. 
♦ _ _ 
Length, 8 9.2 mm., 9 9 mm. Legs, 8 1432, 9 4123. first 
pair a little the stoutest. 
This is a smaller, slighter species than undata. The gray 
and rufus hairs on the top of the cephalothorax are limited to 
form a distinct light band, which narrows and becomes wedge- 
shaped on the thoracic part. The upper sides are very dark 
brown with thin rufus hairs, and the lower sides have a band of 
white hairs. In both sexes the clypeus has long white hairs, the 
hairs over the front eyes being reddish. The abdomen has an 
