34 Myron Harmon Swenk 



propodeum (only a faint median band in calif orniae), a dusky- 

 suffusion on tergites 3-5 and more black on hind femora (only a 

 faint stripe behind in calif orniae). Of the red species with the 

 abdomen not spotted which lack the black bristles on the scape, 

 it is closest to N. corvallisensis Ckll., dift'ering in the wholly red 

 scape, largely red propodeum, slightly shorter third joint of 

 antennae, etc. The third antennal joint is shorter than in A^. 

 atrofrontata Ckll., and A^. excellens Ckll., but is distinctly longer 

 than in A^. astori Ckll., N. ultima Ckll., or N. rohertsonella Ckll. 

 The calif orniae-latifrons-nigrociliata group differs from N.clarkii 

 Ckll., in smaller size, broader head, basal nervure interstitial with 

 or but slightly basad of transverso-medial, etc., from A^. rubrica 

 Provancher, in smaller size, black hind cheeks, black hairs on 

 scape, etc., from A^". kincaidiana Ckll., by more black on the head 

 and thorax, from N. rhodosoma Ckll., by the median mesoscutal 

 stripe and largely black propodeum.. etc. 



Nomada (Nomada) ochrohirta n. sp. 



?. Length 7.5 mm. Related to A'', nigrociliata, just described, and agree- 

 ing with the description of that species except in the following particu- 

 lars : Hair of scape, face, labrum, cheeks, occiput, pleura, mesonotum 

 and sides of propodeum copious though short, and of a bright ochreous 

 color, the legs with the bristles mostly all pale, a very few inconspicuous 

 dark bristles on the sides of the face and more on the sides of abdom- 

 inal tergites 2-(>', punctures of clypeus stronger and rather coarser; apex 

 of hind tibiae with four short straight black setae; nervures black; first 

 abdominal tergite microscopically tesselate; color darker red, the clypeal- 

 supraclypeal suture not black, the black ocellar spot isolated, the mesoscu- 

 tum trilineate with the lateral lines rather obscure, the metanotum red 

 with the edges and sides black, the trochanters all red, only a short and 

 feeble median line at the base of the abdomen and the apical margins of 

 the tergites scarcely at all infuscated. 



Type. — Sioux county, Nebraska, INIay (L. Bruner), $. 



This is apparently another member of the californiac-nigro- 

 ciliata-latifrons group, and is closest to N. latifrons, closer than 

 is A'', nigrociliata even, but is distinguished by the bright ochreous 

 hair of vertex, mesonotum, sides of propodeum, etc., and the 

 fewer black bristles on the face and lack of them on the scape, 

 sides of vertex and hind tibiae. From A'', calif orniae, as from 



34 



