Agalenidm and Dysderidce. 171 



Epigynum, like that of crocata, but with the holes larger and 

 nearer together, fig. ^a. 



The palpal organs and male palpi resemble those of crocata, but 

 are a little larger. 



Three specimens, of different ages, from Medford, Mass., under 

 leaves with C. bivittata. Three adult females from Topsfield, Mass., 

 Sept. 3d, under log in woods. Males and females in N. Pike's Long- 

 Island collection. 



Geotrecha crocata. 



Agroeca crocata Keys., specimens iu Miis. Comp. Zool , Cambridge, Mass. 

 S Herpyllus descriptus Hentz. 

 S Herpyllus crocatus Hentz. 



Plate III, figures 3Z;, 3c, 3d. 



Length of female, 8 to 10'""^ ; cephalothorax, 4™'". The cephalo- 

 thorax is nearly twice as long as wide and widest across the dorsal 

 groove. It is not narrowed behind as much as in G. bivittata. The 

 abdomen is usually longer than the cephalothorax and a little wider 

 at the widest part. 



The cephalothorax is very dark brown or black, and the femora 

 and coxa? of all the legs are the same color. The abdomen is black 

 with a bright red spot of variable shape and size at the posterior end. 

 The spot turns yellow in alcohol. In some specimens it is wanting. 

 In the males the red spot is usually larger, sometimes extending the 

 whole length of the abdomen. The hind legs are black or brown 

 their whole length, a little lighter at the ends ; the other legs are 

 yellow, except the femora. The under side of the body is all black. 



The epigynum has two small round openings, wide apart, a little 

 in front of the transverse fold. Plate iii, fig. 3d. 



The male palpi are much like those of C. bivittata, but the tarsus 

 and palpal organ are only about half as large and the patella and 

 tibia are nearly equal in length. The tibia has a short process on 

 the under side. Figs. 3b, 3c. 



This spider lives among stones in dry, open places. It is easily 

 alarmed and moves very rapidly. The flat, parchment-like cocoons 

 common on stones in pastures are probably made by this species, 



Massachusetts and Connecticut, and in N. Pike's Long Island col- 

 lection. 



