292 Wisconsin Academy of Sciences^ Arts, and Letters. 



sal eyes. Our specimens are rubbed, but what hairs are left 

 on the sides are white and there is a square patch of white hairs 

 between the dorsal eyes. Over the eye of the second row is the 

 same long stiff tuft that appears in the male. The falces are 

 dark reddish-brown without iridescence. The abdomen is dark 

 gray with a white band around the anterior end, and white bars 

 on the sides. On the anterior part are four obliquely directed 

 w^hite spots, and on the posterior, two pairs of transverse bars, 

 which are sometimes continuous at their outer ends, forming the 

 parenthesis-like mark, which is also seen in P. ohscurus. The 

 legs are barred with light and dark brown and the palpi with 

 brown and white. 



The male of this species is distinct from all others by the 

 fringe on the first leg. The female, although smaller, has some 

 resemblance to P. ohscurus, which comes from the same locality, 

 but the cephalothorax is of a different shaj^e, being slender, with 

 the sides nearly straight, while in ohscurus it is widely rounded. 

 It differs also in having the first legs only slightly stouter than 

 the others ; in having the color grey instead of yellowish-brown ; 

 and in having the white spots on the abdomen joined to form a 

 stripe instead of standing separate. 



We have one male and three females, sent to us by Mr. Bol- 

 ter, from Las Vegas, Xew Mexico. 



« 



Pliidippus incertus, sp. nov. 



PI. XXIV, figs. 1-la. 



This is a gray species with white spots. 



?. Length 9-11 mm. Legs 4132. 



The cephalothorax and abdomen are black, covered with gray 

 hairs. There are three white spots on the cephalothorax just 

 in front of the third row of eyes, and on each side of the 

 head are two tufts of black hairs. The abdomen has a white 

 band around the front end, and behind this, two pairs of white 

 spots, the second pair being the larger. From above, the pos- 

 terior part of the abdomen appears to be marked with two pairs 

 of white bars. These extend downward on each side and join, 

 forming a curved band. The palpi are brown covered with 



