1912] Emerton — Four Burrounng Lycosa 31 



cially abundant in the sandy hills of Cape Cod, Mass., and in the 

 dunes from Cape Ann north to Plum Island. The spiders de- 

 scribed by Marx were from Long Island, New York, where it is 

 abundant. 



Lycosa n id if ex Marx 



PI. 4, Figs. 2, 2a, 2b, 2c. 

 American Naturalist, 1881. 



This species has for the most part been confounded with L. 

 fikei. In 1870 I described in the American Naturalist the holes 

 of this spider with their large turrets at the mouth covered with 

 grass and leaves, but found at that time only immature spiders 

 which I did not distinguish from L. pikei, which I afterward found 

 at the seashore. In my own writings and in those of McCook, 

 Montgomery and Chamberlin, Lycosa arenicola or nidifex has 

 included both species. Marx left no type specimens, but in his 

 collection now at the U. S. National Museum are spiders of this 

 species taken in the neighborhood of Washington and no doubt 

 the ones used by Marx at the time he described Lycosa nidifex. 



The color of the female is dark gray modified by lighter hairs, 

 with very little difference between the front and hind legs and 

 anterior and posterior parts of the body. The cephalothorax 

 has a lighter middle stripe and the abdomen has a dark middle 

 stripe following at the front end the shape of the dorsal vessel, at 

 the sides of which the abdomen is lightened by paler or yellowish 

 hairs. On the under side the legs I and II have the four terminal 

 joints black, the femora and the other legs gray with light hairs. 

 The coxae, sternum and maxillae are also gray, a little darker than 

 the legs. The under side of the abdomen is pale with a dark mid- 

 dle band and dark sides and spinnerets, the width of the dark band 

 is variable and in some individuals appears to cover the whole 

 abdomen with dark color. 



The male is light gray, when freshly molted varying from bluish 

 gray to flesh color. The middle stripe of the cephalothorax is 

 bordered with black, broken into radiating dark lines extending 

 forward beyond the upper eyes. On the abdomen there is a dis- 

 tinct dark mark over the dorsal vessel and a less distinct and wider 

 stripe extending back to the spinnerets. The mandibles have 

 more orange hairs than in the female and in some individuals the 



