658 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.39. 



red, with the first five joints black above, and the others with blackish 

 stains; thorax black, coarsely punctured, with the upper border of 

 prothorax more or less, the tubercles and the scutellum red; a small 

 red mark on pleura anteriorly; femora, tibiae, and tarsi clear red, the 

 femora black at base beneath; tegulse red, punctured; second s. m. 

 very broad, not narrowed above, receiving first r.n. beyond middle; 

 abdomen clear light ferrugijious red, with the spots light lemon yellow; 

 base of first segment black right across; yellow markings consisting 

 of two small marks on first segment, a very broad band, rather 

 broadly interrupted in middle, on second, a broad band, broadly inter- 

 rupted in middle, on third, and two small transverse marks on fourth; 

 yellow on venter confined to a large spot on apical segment; apical 

 plate strongly notched. 



Hahitat.— West Cliff, Colorado (T. D. A. Cockerell). From Ash- 

 mead's collection. Some of the assigned characters are doubtless 

 variable, but the light abdomen is likely to be distinctive. The first 

 abdominal segment is very much broader than in N. perjjilexans Cock- 

 erell, which also differs in other ways. 



Type.— Cat. No. 13437, U.S.N.M. 



NOMADA FORMULA Viereck. 



Los Angeles County, California (Coquillett), one male. The apical 

 plate of the abdomen is deeply notched. 



NOMADA SEMISUAVIS Cockerell. 



California, with number 324, one male; Coronado, California, June 

 18, 1890 (Coquillett), one female. New to California, and the female 

 is new. The female resembles the male, and is distinguished from N. 

 suavis by the very densely punctured mesothorax. The legs are 

 yellow and black, with only a little red, and the metathorax has two 

 very large yellow patches. The anterior coxse are strongly spined. 



