Tertiary Spiders and Opilioiiids. 



26; 



its spines have a more regular arrangement. Mention must be 

 made of the presence of hair in the area behind what Scudder 

 described as the abdomen in specimen Xo. 13522. The hair cov- 

 ered area extends all the way to the end of the hind legs. If this 

 area represents the actual end of the abdomen, as is very likely, 

 then the abdomen is much longer than it is represented in Scud- 

 der's description. In every other respect his description is correct. 



Tethneus twenhofeli n. sp. (Textfignre ^i). 



One male in the collection of W. H. Twenhofel of the Univer- 

 sity of Kansas. 



Figure 31. — Tethneus tivcnh.ofcli n. sp. x 3.33. 



The specimen is fairly well preserved and presents the dorsal 

 surface with coxae and chelicerse impressed on the carapace. 

 Pedipalpi and legs are complete except for those of the fourth 

 pair one of which is broken off across the tibia and the other 

 across the metatarsus. The spider has a close resemblance to 

 some recent Epeira, but I placed it under Tethneus on account 



