30 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.48. 



In the key this falls next to A. viburnella, which is considered a 

 subspecies of A. perplexa. 



Type.— Oat. No. 18165, U.S.N.M. 



6 31 . Tarsi dark. 



a 35 . Large species, anterior wing 10 mm. long; with, fulvous or ferruginous hair. 



(See A. jockorum, under Trachandrena, above.) 

 o 35 . Small, or if approaching size of A. jockorum, hair not red. None have flagellum 



brightly colored beneath. 

 a 36 . Sides of front with black hair. (If hair of face all black, see A. nigrihirta and 



A. micranthophila.) 

 a 37 . Hair of thorax above ferruginous. 

 a 38 . Larger; cheeks very broad, shining, angled behind; head very large. 



ANDRENA HEMILEUCA Viereck. 



East of Lake George, Colorado. June 18. (S. A. Rohwer.) 

 Male. — Length, about 10 J mm. Black, the tarsi reddish apically, 

 the hind tarsi entirely dark reddish. Pubescence pale fulvous, black 

 at sides of face and top of cheeks. Head large and broad; facial 

 quadrangle much broader than long. Process of labrum deeply 

 emarginate. Mandibles long, curved downward, red at end. 

 Clypeus brilliantly shining, sparsely punctured. Antennae black; 

 third joint little longer than fourth and about equal to fifth. Cheeks 

 very broad, smooth and shining, produced nearly to a right angle 

 behind. Mesothorax hardly punctured, dull in front, shining behind. 

 Scutellum shining. Area of metathorax dull and granular. Tegulae 

 rather light reddish. Wings hyaline, faintly dusky; stigma and 

 nervures ferruginous; stigma very bright; outer nervures becoming 

 fuscous. Basal nervure falling just short of transverse median. 

 Second submarginal cell very broad, receiving first recurrent nervure 

 very near its end. Abdomen shining, not punctured, with thin red- 

 dish hair forming very thin inconspicuous bands; second segment in 

 middle depressed hardly one-fourth. Apical plate narrow, not 

 emarginate. 



(This is determined as A. Tiemileuca by Viereck; the original Tiemi- 

 leuca came from Washington and Oregon, and was based on the 

 female, which is 10 mm. long. Female A. Tiemileuca is shown in the 

 key to have the following characters: Most dorsal abdominal seg- 

 ments impunctate or indistinctly punctured ; second dorsal segment 

 with more or less abundant erect or nearly erect hair; hair of scopa 

 pale; dorsal segments with dark hairs; posterior tibiae blackish; 

 pubescence of face concolorous, all black; clypeus coarsely punctured. 

 Male A. Tiemileuca is shown in the key to have the facial tegument all 

 dark; third antennal joint shorter than fourth; cheeks angled, the 

 angle opposite middle of eye. The male falls in a couplet with 

 A. integra.) 



o 38 . Smaller; cheeks dullish, not very broad. 



