ART. 19. AMERICAN BEES OF THE GENUS HALICTUS SANDHOUSE, 31 



ovate, shining, impunctate, almost without pubescence; apical margins 

 of segments dark testaceous. Wings quite clear; anterior wing 

 about 4.5 mm. long; stigma and nervures dark testaceous; basal 

 nervure very gently arched; second submarginal cell higher than 

 broad, receiving the first recurrent nervure near the apex; third sub- 

 marginal not contracted above, about twice as long as the second on 

 marginal. Legs black. 



Habitat.— Vesiceiul Valley, Colorado, 1919 (Cockerell). 



Type.— Cat. No. 26430, U.S.N.M. 



Differs: From ruidosensis Cockerell by the shining, more sparsely 

 punctured mesothorax and scutellum; sculpturing of the disk of 

 propodeum; polished abdomen. 



From viridatus Lovell by the shining blue head and thorax; more 

 sparsely and delicately punctured mesothorax; impunctate abdomen. 



HALICTUS (CHLORAUCTUS) ASTUTUS,new species. 



Male. — About 7 mm. long; head and thorax largely dark blue-green; 

 abdomen black; pubescence dull white. Facial quadrangle distinctly 

 longer than broad; orbits converging below; face clothed with rather 

 sparse, dull white hairs; front above the antennae without punctures, 

 but rough, giving it a dull appearance; below the antennae, it is sparsely 

 punctured; supraclypeal area and upper half of clypeus microscopically 

 tessellate, sparsely punctured; antennae dark, third joint scarcely 

 longer than the second; flagellum rufo- testaceous beneath. Thorax 

 with moderately dense, long hairs; mesothorax smooth, shining, sparsely 

 and coarsely punctured; scutellum duller, but with similar punc- 

 tation, two smooth spots on the disk; disk of propodeum crescentic, in- 

 closed by a rim posteriorly, with coarse rugae not quite reaching the 

 apex, which is microscopically tessellate, but the rugae extend over the 

 lateral margins of the disk; upper half of lateral sides and posterior 

 side of propodeum coarsely rugose: truncation clearly defined latter- 

 ally; tegulae dark, impunctate. Abdomen narrowly ovate, impunc- 

 tate; apical margins of segments polished and narrowly testaceous; 

 the bases of the segments covered with sparse pubescence. Wings 

 hyaline; anterior wing 5 mm. long; stigma and nervures dark; second 

 submarginal cell higher than broad, contracted above, receiving the 

 first recurrent nervure very near the apex; third submarginal higher 

 than broad, hardly contracted above, twice as long as the second on 

 marginal. Legs black, with yellowish white pubescence; tarsi some- 

 what reddened. 



Habitat. — Beulah, New Mexico, August 18 (W. Porter). 



Type.— Cat. No. 26431, U.S.N.M. 



Differs: From ruidosensis Cockerell by the shining, more sparsely 

 punctured mesothorax; shape and sculpturing of the disk of propo- 

 deum; impunc tate abdomen. 



