550 PROCEEDINGS OF THE ACADEMY OF [Nov., 



NEW SPECIES OF NORTH AMERICAN BEES OF THE GENUS ANDRENA FROM 



WEST OF THE 100TH MERIDIAN CONTAINED IN THE COLLECTIONS 



OF THE ACADEMY OF NATURAL SCIENCES OF PHILADELPHIA. 



BY HENRY L. VIERECK 



The following descriptions are contributions toward a monograph 

 of the Pan-American species of Andrena. 



The proportions are in terms of divisions of a disc micrometer, 

 with 100 divisions to 1 mm., used in a Spencer Lens Co. binocular 

 with 10 x ocular and 40 mm. objective, each division equals nearly 

 42/,. 



Andrena (Andrena) azygos new species. 



Type.— No. 4,010. The Academy of Natural Sciences of Phila- 

 delphia. 



Type Locality.— Cloudcroft, New Mexico, June 16, 1902 (H. L. 

 Viereck). 



Related to A. (A.) asmi Viereck. 



Male. — Length 8.5 mm.; body black, mostly covered with ochreous 

 hair; head with its facial line : transfacial line :: 45 : 64, axial 

 line : temporal line :: 32 : 22, temples produced, almost right 

 angular, the angle apparently opposite middle of eye, malar line : 

 joint 3 of antennae :: 3 : 7, elevated portion of malar space much 

 shorter than the depressed portion, head covered with ochreous 

 hairs except along the inner eye margin, upper eye margin, and 

 outer eye margin above the middle of temples and on the front where 

 the hairs are black, front indistinctly punctured, dullish, reticulated 

 and finely longitudinally striate, ocellocular line : ocelloccipital 

 line :: 14 : 5, face shining, distinctly punctured, its punctures from 

 one to three puncture widths apart, clypeus nearly planate, clypeus 

 apparently slightly concave near apex, more shining and more 

 distinctly punctured than the face, not elevated directly above the 

 apical margin, clypearea wanting, sculpture of the clypeus not 

 hidden by the moustache, labrarea with a broad rounded emargina- 

 tion, polished, its width at base : length down the middle :: 7 : 3, 

 width at base : greatest length :: 7 : 4, width at apex : length down 

 the middle :: 6 : 3, labrarea at base apparently half as wide as the 

 labrum, the latter with a fringe of ochreous hairs, joint 3 of antennae : 

 4 :: 7 : 8, joint 4 and following joints from a little more than one 



