44 Proceedings of the Biological Society of Washington. 



Geophihis alaskanus Cook, described from Sitka, Alaska, is a somewhat 

 similar species. It differs in its deeper, Linotaenia-like coloration, in hav- 

 ing the last ventral plate trapeziform and nearly as wide as long, in the 

 fewer coxopleural pores, more numerous legs, smaller first legs, and in having 

 the anal legs of male not truly crassate with claws of nearly normal size. 



9. Gosibius arizonensis Chamberlin. 

 One adult female taken at Flagstaff, Arizona, 7 October, 1916, D. A. 

 Gilchrist. 



10. Ezembius stejnegeri (Bollman). 



One specimen apparently this species, taken in the Iditarod region, 

 Alaska, 27 July, 1917, A. H. Twitchell. 



11. Neolithobius mordax (Koch). 

 A male taken at Bay City, Texas, 1 January, 1918, by A. Wetmore. 



12. Neolithobius, sp. 

 Two specimens were taken from the crop of an eared grebe, Colymbus 

 nigricollis calif ortticus (Brehm), collected at St. Xavier, Montana, 31 

 May, 1917. They are in too poor a condition for certain identification. 



