296 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 38. 



Denton and Wichita Falls, Texas. The Wichita Falls (female) 

 specimen is from flowers of Helianihus, June Hi, 1906 (J. D. Mitchell, 

 collector). The Denton (both sexes) specimens are from flowers of 

 Rudbeckia amplexicaulis, June 29 (F. C. Bishopp, collector). 



The produced hind trochanters of the male occur also in all members 

 of the neradensis «;roup. 



GROUP OF NOMIA NORTONI. (PARANOMIA.) 



Hind margins of abdominal segments iridescent green or blue; 

 tongue slender; apex of male antennae neither flattened nor dilated. 



(A) Male antennae long, with the last joint elongated and sharply 

 pointed. 



Nomia nortoni Cresson. Kansas, Texas, and New Mexico. X. 

 cressoni West wood, from Mexico, is the same. I have a Mexican 

 specimen. This species is much the lafgesl of the group; anterior 

 wing about 13 mm. 



N. melanderi Cockerell. Known only by a single female from 

 Washington State. It is not certain, in the absence of the male, that 

 this belongs in the subgroup with pointed antenna', but I believe it 

 is correctly so referred. 



NOMIA CALIFORNICA, new species. 



Nomia californica Ashmead MS. (No description.) 



Female. Size and form of A', melanderi, from which it differs as 

 follows: Abdominal bands lighl yellowish-green, with a variable 

 amount of orange suffusion; first segmenl with an entire narrow 

 apical band; stigma redder. Thus, while t he differences are technic- 

 ally very slight, the insect looks quite distinct. There is a good 

 deal of short black hair on the thorax above, and the tegulse are red- 

 dish black. 



Habitat Southern California, "No. 331, through C. V. Riley;" 

 Los Angeles County, California (D. W. Coquillett, collector). 



Type-specimen.— Cut. No. 12986, U.S.N.M. 



NOMIA ACUS, new species. 



Male. Anterior wing a fraction over- «.» mm. Male flagellum long, 

 pale yellowish-fulvous beneath, the last joint long and pointed as in 

 N.nortoni; thorax above very strongly punctured, and with grayish- 

 white hair, scutellum slightly bigibbous; abdomen narrow basally, the 

 first two segments very coarsely punctured, the others finely; first 

 segment with hind margin wholly dark; segments 2 to 5 with broad 

 light bluish-green bands; structure of legs as in A', nortoni, i\w hind 

 femora greatlj swollen, and the hind tibia- with a very large quad- 

 rangular pale honey-colored lobe; tarsi fuscous; fourth ventral 

 abdominal segment divided into two plates as in A', nortoni This 



