294 Wisconsin Academy of Sciences, Arts, and Letters. 



iridescent. The palpi are dark brown with white hairs, and the 

 legs dark brown with light brown hairs. 



We have a single female from Chihuahua, [Mexico, where it 

 was found by Mr. Townsend at a height of 7,000 feet above the 

 sea. 



Pliidippus ohscurus, P. 

 PI. XXIY, figs. 2-2e. 



A very handsome species of a gray or brown color, orna- 

 mented with snow-white bands and spots, which are edged with 

 black. 



^ . Length 10 mm. Length of cephalothorax, 4.8 mm. ; 



width, 4 mm. Legs 1423 ; those of the first pair as long as the 

 body. 



?. Length 10-13 mm. Legs 4132. 



The cephalothorax is reddish-brown, covered with snowy 

 white hairs. In the female there are long, stiff, black hairs 

 around the eyes of the second row and on the middle of the 

 cephalic part, while the male has a ridge of stout rusty-brown 

 hairs beginning at each of the dorsal eyes and passing within 

 the eye of the second row to just above the lateral eye, while a 

 row of shorter hairs of the same color, above the first row of 

 eyes, connects the ends of these two ridges. The male has also, 

 low down on each side of the cephalothorax, between the dorsal 

 and lateral eyes, a long tuft of the same rusty-brown hairs, and 

 these are connected by a fringe of shorter hairs of the same 

 color, which crosses below the first row of eyes, edging the cly- 

 peus, and hanging down over the falces. The falces are iri- 

 descent in both sexes, but while in the female there is a band of 

 white hairs across the upper part, in the male they are almost 

 covered with white rice-like scales passing into a stiff fringe 

 of long white hairs, which look as if they had been cut squarely 

 off. In our male specimen fne abdomen has been rubbed, and 

 shows only a dark brown integument with a thin covering of 

 white hairs ; it was probably like that of the female, which is of 

 a delicate gray color. The pattern is essentially the same in 

 both, and is made up of white bands and spots outlined in black. 



