10 



PROCEEDINGS OF THE NATIONAL MUSEUM 



Legs short; first femora much broader than long, the anterior ex- 

 pansion of the same being quadrangular. Pseudosegmentations of 

 tibiae faint for first pair but conspicuous for the others. 



Length of female, 2.90 mm.; width, 1.05 mm. 



Tyye host. — A swift, Cyfseloides niger borealis. 



Type (holotype) .—Csit. No. 42762, U.S.N.M. 



Described from a single female taken from the type host, Seattle^ 

 Wash., August 2, 1924, by W. L. McAtee. 



FiGDKB 4. — Dbnntus (Ctbnodbnnyos) spiniger, new species. 

 Dorsal view op head and prothorax, X60. (Drawn by 

 Dr. E. A. Chapin) 



Genus EUKEUM Nitzsch 



In addition to the characters given in the key others of minor 

 generic importance should be added : Instead of there being only sis 

 posterior marginal setae on the pronotum there are twelve. The 

 mesothorax is greatly reduced, so much so that but little of it is seen 

 above; however, it is separated from the metathorax by a distinct 

 suture. The last abdominal tergite is deeplj^^ and roundly emarginate 

 on the median line. 



Type species. — E. cimicoides Nitzsch. 



The type species of the genus has as its type host the European 

 swift, Micropus apus. What appears to be the same species comes 

 from our American swift. 



EUREUM CIMICOIDES Nitzsch 



Head fully twice as broad as long, the forehead being broadly and 

 evenly rounded throughout; eyes revealing their double nature in 



