28 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.65. 



emarginate posteriorly, with irregularly anastomosing rugae; trunca- 

 tion distinct laterally; tegulae dark, impunctate. Abdomen ovate, 

 shining piceous, sparsely pubescent; the bases of the segments punc- 

 tate; the apical margins testaceous with microscopic, transverse line- 

 olations. Wings hyaline; anterior wing 4.5 mm. long; stigma and 

 nervures dark testaceous; second submarginal cell higher than broad, 

 receiving the first recurrent nervure one-third of the distance from 

 the apex; third submarginal broad, sharply contracted above, about 

 one and one-half times as long as the second on marginal. Legs black ; 

 sparsely pubescent; tarsi yellow. 



Habitat. — Ward, Colorado, August 10 (Cockerell). 



Ty2)e.— Cat. No. 2G425, U.S.N.M. 



HALICTUS (CHLORALICTUS) PIKEI, new species. 



Male. — About 7 mm. long; head and thorax brilliant dark blue; 

 abdomen black; pubescence white. Facial quadrangle considerably 

 longer than broad; orbits converging slightly below; antennae dark 

 testaceous, the third joint longer than the second; flagellum yellow- 

 testaceous beneath; face shining, sparsely pubescent; front above the 

 antennae closely punctured, the punctures becoming more sparse 

 below; lower half of clypeus pale yellow; mandibles dark, reddish at 

 the apex. Thorax with short hairs; mesothorax shining, the disk 

 rather coarsely punctured, the punctures about the diameter of a 

 puncture apart; outside the disk, the punctures are more delicate; 

 scutellum greenish blue, shining, delicately punctured; disk of pro- 

 podeum long, without a distinct inclosing rim, with very irregular 

 rugae extending to the apex; mesopleurae shining, with shallow 

 punctures; truncation distinct laterally; tegulae dark, impunctate. 

 Abdomen ovate, shining, sparsely pubescent; the only punctures 

 piliferous; the bases of the segments 4-5 with a bluish reflection; 

 apical margins of segments brownish. Wings clear hyaline; anterior 

 wing 4.75 mm. long; stigma and nervures dark testaceous; basal 

 nervure strongly bent; second submarginal cell higher than broad, 

 receiving the first recurrent nervure very near the apex; third sub- 

 marginal about t\vice as long as the second on the marginal. Legs 

 black, with dull white hairs; knees red; tarsi yellow. 



Hahitat. —Ynnting OfTice, Pikes Peak, Colorado, September 17 

 (Cockerell). 



Type.— Cut. No. 26426, U.S.N.M. 



HALICTUS (CHLORALICTUS) OBNUBILUS, new species. 



Male. — About 4 mm. long; head and thorax dark blue-green; 

 abdomen black; pubescence white, sparse. Facial quadrangle longer 

 than broad; orbits converging sharply below; antennae dark, second 

 and third joints of equal length; flagellum dark brown, hardly paler 



