8 Occasional Papers of the Museum of Zoology 



"They can hardly 1)e any other of the known western 

 Sl'lucria: S. dcntaiiiin is barely known. T. Prime states that 

 he has seen one adult and one young specimen and his descrip- 

 tion is insufficient for distinction in this difficult genus." 

 (Sterki). 



17. Pisidium hnachiicaniim P. & F. — Spring in Cortez 

 foot-hills. Plumboldt N'alley, Elko County, Nevada. 



