1913.] NATURAL SCIENCES OF PHILADELPHIA. 181 



apart, and closer to the smaller P. S. E. Abdomen pale; very- 

 hairy, with a few dark bands on the apical part; much as in some 

 Cicurinas. 

 Tegenaria emertoni Simon. Figs. 39, 41. 



Many pale marks on basal part of abdomen, but dark at the tip. 

 Male and female. 

 Tegenaria nana Simon. Fig. 47. 



A small pale species, with markings similar to those of Cicurina 

 arcuata on the abdomen. Two females. 



Amaurobius pictus Simon. Fig. 24. 



As we have identified it, with many marks on the abdomen. 



Amaurobius severus Simon. Fig. 27." 



The abdomen above has only four pale basal spots. 

 Amaurobius nevadensis Simon. Fig. 20. 



As large as A. severus, but the abdomen of the female has no pale 

 marks on the base, but in male there is one each side. 

 Plectrurys tristis Simon. Fig. 29. 



The male palpus is figured. 



Physocyclus dugesi Simon. Fig. 25. 



One male, the palpus is very complicated. 



Megamyrmecion californicum Simon. Fig. 13. 



One immature female, but the same as I have identified from 

 California. 

 Sergiolus cyaneiventris Simon. Fig. 8. 



One female. Cephalothorax and legs all reddish, abdomen 

 blackish, a narrow white band across middle, and just behind it are 

 the two dark impressed lines; all femora with very stout bristles; 

 no dorsal groove. 

 Castianeira bicalcarata Simon. Figs. 21, 26. 



One male. Cephalothorax yellowish -brown; abdomen small, pale; 

 legs slender, yellowish. Mandibles large and stout; sternum as 

 Inroad as long. 

 Maypacius floridanus Simon. Fig. 30. 



A slender species like a Tibellus, the abdomen spotted beneath, 

 spots on the mandibles, and femora and tibia I dark beneath, spotted 

 in front. Not mature. 



Titiotus californicus Simon. Fig. 23. 



The head resembles an Amaurobius; a very large species, legs 



