20 PROCEEDINGS OF TEE NATIONAL MUSEUM. vol.48. 



smooth median line; sides of front dull and depressed; vertex short; 

 cheeks short, shining; antennae short, looking like those of a female, 

 the flagellum bright ferruginous beneath except basally. Third an- 

 tennal joint very much longer than fourth; fifth very short, much 

 broader than long. Mesothorax moderately shining, with distinct 

 but small and not crowded punctures. Scutellum strongly shining. 

 Metathorax dull and granular, the triangular area merely defined by 

 a depressed line. Tegulae dusky testaceous. Wings clear hyaline, 

 nervures and stigma light reddish. Basal nervure going some distance 

 basad of transverse median, first recurrent nervure joining second 

 submarginal at middle; second transverse cubital wanting on one 

 side. Abdomen shining, but well though not densely punctured; 

 hind margins of segments rather broadly pallid; second segment in 

 middle depressed hardly one-half. Apical plate broadened at end 

 like an ax blade. End of sixth ventral segment turned up and 

 projecting at sides. 



Type.— Cat. No. 18136, U.S.N.M. 



In the key, this falls close to A. permitis, but has brownish tarsi, 

 those of permitis being stramineous. Its closest ally is a species still 

 undescribed. 



6 21 . Flagellum very long. 



ANDRENA CHEYENNORUM, new species. 



War Bonnet Canyon, Sioux County, Nebraska. June 4, 1902. On 

 Symplioricarpus. (M. Cary.) 



Male. — Length, 9J mm. Black, all the tarsi clear ferruginous. 

 The very long flagellum chesnut red beneath except the first joint. 

 Clypeus, except two triangular spots and lower edge, light yellow, but 

 no lateral marks. Head rather oblong, facial quadrangle longer than 

 broad. Malar space rather large. Mandibles not elongate, process 

 of labrum emarginate. Clypeus, which is high, smooth, and sparsely 

 punctured, with no median line. Cheeks ordinary. Third antennal 

 joint longer than fourth, but fourth longer than broad. Hair of head 

 and thorax very pale ochreous. Mesothorax rather shining, very 

 feebly punctured. Area of metathorax dull and granular. Tegulae 

 dark reddish. Wings reddish hyaline, faintly dusky at apex; stigma 

 and nervures bright amber; basal nervure meeting transverse median; 

 first recurrent nervure joining second submarginal before middle; 

 third submarginal cell very long. Abdomen shining, hardly punc- 

 tured, hind margins of segments brownish; second and following 

 segments with rather distinct white hair bands, failing in middle on 

 second and third. Apical plate very broad at end, truncate and 

 ciliate. 



Female. — (With same data as male.) Length, 11 mm. Pubes- 

 cence more brightly colored, pale orange on hinder part of thorax above, 



