2ti2 Mr. T. D. A. Gockerell— Descriptions and 



hair on head and thorax, much darker wings, differently 

 coloured abdominal bands, &c. The abdomen is flatfish. 

 Bab. Mexico (Deppe). Two females : Berlin Museum, 



2584, 2585. 



Andrena dallasiana, sp. n. 



<$ . — Length slightly over 7 mm. 



Black, without light markings on face; all the tarsi light 

 ferruginous; hind tibiae light ferruginous, with a median dark 

 cloud ; pubescence dull pale ochreous ; abdomen shining, very 

 minutely and inconspicuously punctured, without any definite 

 hair-bands except, rather indistinctly, at sides of segments ; 

 head broader than long; mandibles ferruginous at apex; clypeus 

 densely covered with hair ; cheeks ordinary ; vertex dull ; an- 

 tennae thick, moniliform, third joint conspicuously shorter than 

 fourth, flagellum obscure reddish beneath ; mesothorax dull 

 and granular, with sparse small punctures ; area of meta- 

 thorax with delicate but evident ridges; tegulse fulvous. 

 Wings reddish hyaline, nervures and stigma clear ferrugi- 

 nous ; stigma large ; third s.m. more than twice as broad as 

 second; second abdominal segment depressed a little less 

 than one-third. 



This is extremely close to an insect from Fort Collins, 

 Colorado, determined by Mr. Viereck as A. texatia, Cresson, 

 but not agreeing well with Cresson's description (Viereck 

 must have had access to Cresson's type, however). It differs 

 by the proportionately shorter third antennal joint, lighter 

 tegulse, redder wings, more delicate sculpture of metathorax, 

 and somewhat narrower face. In Viereck's table in Entom. 

 News, July 1907, it runs to A. dceckei, but differs by having 

 the second dorsal segment depressed less than one-third ; in 

 .Robertson's table of Illinois species it runs in Trackandrena 

 to claytonice, which it very greatly resembles, differing, how- 

 ever, in the much less coarsely sculptured area of metathorax. 

 If run in Andrena s. str. it goes to nasonii, but differs in the 

 antennal joints. 



Hab. Dallas, Texas {Boll) : Berlin Museum, 21288. 



Andrena tacitula, sp. n. 



J 1 . — Length 8 mm. 



Black, comparatively robust, looking like a female ; pubes- 

 cence long, dull whitish, with a yellowish tint on head and 

 thorax above ; head broad, facial quadrangle much broader 

 than long ; eyes dark plum-colour ; process of labrum trun- 

 cate, slightly inclined to be emarginate; clypeus shining, 



