1892.] NA.TURAL SCIENCES OF PHILADELPHIA. 17 



red-brown with black hairs ; spinnerets red-brown. E^^es as in T. 

 perplexa; venter with a large median quadrangular sunken space, 

 $ palpi as figured. 

 Two specimens in field below University. 



Thargalia bivittata Em. 



Frequent in Six Mile Creek often among ants which it resembles, 

 Sept. 

 Thargalia crocata Hentz. 



Rare, one specimen, in field near the University barn. 



Prosthesima rufula, nov. sp. Plate I, fig. bb and 55a. 



Total length 9 5-9mm. 



Length of cephalothorax 2-45mtu. breadth rTmm. 



Length of abdomen 3"5 mm. breadth 2* mm. 



A larger 9 total length 7* mm. length of cephalo. 2'5mm. 



Cephalothorax nearly uniform reddish, the marginal seam 

 blackish ; mandibles similar, sternum more yellow in center and 

 red-brown on sides ; lip red ; maxillse yellowish ; legs red-brownish 

 yellow ; epigynum red ; under spinnerets light, upper ones nearly 

 black, abdomen above and below blue-black or blackish ; venter 

 with two narrow converging white lines. Upper row of eyes 

 scarcely longer than lower and a little procurved ; the upper M. E. 

 large and oblique ; a little black around the lower M. E. Head 

 much narrowed ; body and legs covered with black hairs ; lower 

 spinnerets the longest. 



The cocoon of this species is attached to the under side of stones; 

 it consists of two circular sheets of silk between which are placed 

 the eggs. The outer sheet is often covered with dirt or mud so as 

 to resemble the stone. 



Frequent. Sept., Oct., Fall Creek, South Hill, Heustis St. 



Prosthesima frigida, nov. sp. Plate I, fig. 56, 56a. 



Total length 9 4-Gmm. 



Length of cephalothorax l'9mm. breadth r8mm. 



Length of abdomen 2-7mra. breadth l-5mm. 



Male about the same size. Cephalothorax brownish-yellow ; 

 seam black ; mandibles similar ; a little black around eyes ; a small 

 V-shaped blackish mark just in front of dorsal groove ; basal joints 

 of legs and palpi very light, nearly white ; distal joints redder ; 

 sternum yellowish, darker on sides; epigynum reddish, surrounded 

 by black ; lower spinnerets lighter than upper ; abdomen above and 



