no. 2064. BEES OF GENUS ANDRENA—VIERECK AND COCKERELL. 3 



falls in the table in a couplet with a species (still undescribed) which 

 differs from it by the dullish, almost impunctate clypeus. 



Type.— Cat. No. 18120, U.S.N.M. 



(The type of Andrena coloradina, variety A, described below, has 

 only two submarginal cells on one side.) 



o 1 . Species with three submarginal cells. 



a*. Species of the subgenus Trachandrena. 



a*. Large species with the aspect of Andrena carlini; modified part of second abdomi- 

 nal segment extending almost to base of segment in middle ; hair of thorax above 

 creamy white. 



ANDRENA SWENKI, new species. 



Moscow, Idaho, No. 121. 



Female. — Length, 13 mm. Robust species, superficially resem- 

 bling A. vicina. Black, with reddish-black hair, but that on meso- 

 thorax, scutellum, post-scutellum, tegulae and borders of tubercles 

 creamy white; on underside of anterior femora pallid. Facial 

 quadrangle considerably broader than long. Process of labrum 

 truncate. Clypeus very coarsely and extremely densly punctured, 

 with a median smooth line. Facial foveae seen from above pale 

 grayish brown, occupying a little more than half the space between 

 eye and antenna, below narrowed, and ending about level with top 

 of clypeus or a little lower. Flagellum obscurely reddish beneath. 

 Third antennal joint about as long as the next two combined. Meso- 

 thorax and scutellum very coarsely punctured, but the surface 

 largely hidden by hair. Area of metathorax with very strong, 

 rather regular, longitudinal ridges. Tegulae rufo-piceous. Wings 

 dusky hyaline, stigma and nervures dark rufo-fuscous, basal rervure 

 meeting transverse median, second submarginal receiving first re- 

 current nervure beyond middle. Spurs red. Abdomen shining, 

 the depressed portions of the segments extremely large, that on 

 second in middle occupying at least three-fourths of segment. These 

 depressed parts shining and very sparsely and feebly punctured; 

 the other parts, which broaden laterally, strongly puctured, but 

 first segment slightly punctured all over. No distinct hair bands. 

 In the table it is separated from several allies (A. striatifrons, A. 

 semipunctata, A. spireana) by the distinctly punctured depressed 

 part of second abdominal segment. 



Type. — Entomological collection of the University of Nebraska. 



6 4 . Large species (male), with red hair. 



ANDRENA JOCKORUM, new species. 



Peck, Idaho, April 8, 1900. 



Male. — Length, 12 mm. Black with tarsi reddish apicalry, 

 pubescence throughout warm reddish ochreous, long and brightly 

 colored on face and thorax above. Malar space very short; process 

 of labrum broad, truncate, shallowly emarginate; clypeus and side9 



