﻿March 1895. 1 BaNKS. NoTES ON PsKlfDOSCORPIONIDA. 11 



Cephalothorax about as broad as long threveneti. 



C'ephalothorax distinctly longer than bioad rufulum. 



Ideobisium threveneti Si//io/i. 



Ohisinin ilircvi')u-ti SiM(iN, Ann. Soc. Ent. Fr., 1878. 



Common on the' Pacific Coast States. In moss and rotten 

 wood, Portland and Astoria, Oreg., (Hubbard); Portland, Oregon, 

 (Schwarz); Temino, Wash., (Hubbard); Olymjiia, Wash., (Kincaid); 

 Simon had it from California. 



Ideobisium rufulum Bks. 



Olpiitiu rii/ithii/i Hanks, ('an. ]-"nloni., .\'ig., iSoi. 



Washington, D. C; Fredricksburg, Va., (Richardson). 



Ideoroncus Balza/i. 



Differs from the preceding genus in having but two eyes. 

 The males which I have seen lack the stylet to the mandibles, 

 a strange exception. 



Ideoroncus obscurus Bks. — Can. Entom., March, 1893. 



The specimens from which I described the species were not 

 quite adult; adult 9's are often 4 mm. long and usually darker 

 than described. It is common in the e.xtreme West. Olympia, 

 Wash., (Kincaid); Nafl. Park, (Hubbard); Bear Paw Mts., Mont., 

 (Hubbard); Assiniboine, Mont., (Hubbard); one specimen. Lake 

 Tahoe, Calif., (Hubbard). 



Tribe Orisini. 

 Obisium ///. 



Our species of this genus may be separated as follows : 



^ No eyes, cave form cavicola. 



' Four eyes, not cave - 



[ Tibia of palpus with the inner side first convex, then nearly straight, 

 2 -j fingers longer than hand 3 



( Tibia of palpus with inner side evenly convex 4 



3 Hand about twice as long as broad, large species carolinensis. 



^ ( Hand one and one-half times as long as broad, small species, .brunneum. 



\ Fingers very much longer than hand macilentum. 



( !• ingers a little shorter than hand parvulum. 



Obisium cavicola Pack.— Am. Nat., I'eb , 1884. 



Unknown to me. Somewhat peculiar in the shape of the 

 cephalothorax and in the form of the tibia of the palpus. New 

 Market Cave, Va. 



