26 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.65. 



very sharply defined; tegulae pale testaceous, impunctate. Abdomen 

 ovate, shining, sparsely pubescent, with delicate pihferous punctures 

 on the bases of segments; apical margins of segments narrowly tes- 

 taceous. Wings hyaline, faintly dusky; anterior wing 4 mm. long; 

 stigma and nervures testaceous; subcostal nervure dark; second sub- 

 marginal cell higher than broad, contracted above; first recurrent 

 nervure joining the second transverso-cubital; third submarginal nar- 

 row — that is, higher than broad — about twice as long as the second 

 on the marginal. Legs black with knees, tips of tibiae and tarsi 

 rufo-testaceous; pubescence pure white. 



Habitat. — Boulder, Colorado, July 28, and September 12, 1908 

 (S. A. Rohwer). Two specimens. 



Type.— Cat. No. 26422, U.S.N.M. 



Quite similar to disparilis Cra^^^ord, from which it differs by the 

 more sharply converging orbits; yellow clypeus; shape and sculp- 

 turing of the disk of the propodeum, 



HALICTUS (CHLORALICTUS) PEREXIGUUS, new species. 



Male.— Ahont 5 mm. long; head and thorax greenish blue; abdo- 

 men brown; pubescence white. Facial quadrangle longer than 

 broad; orbits converging sharply below; eyes bulging, giving the 

 face a circular appearance; antennae rufo-testaceous; second and 

 third joints of antennae of equal length; flagellum yellow-testaceous 

 beneath; front covered with appressed white hairs, above the 

 antennae very closely punctured, below the punctures become more 

 sparse; lower half of clypeus and mandibles yellow; clypeus pro- 

 duced little below the lower margin of the eyes. Thorax with 

 moderately dense pubescence; meso thorax shining, with delicate, 

 moderately close punctures; median and parapsidal grooves distinct, 

 but not deeply impressed; scutellum and metathorax shining, deli- 

 cately punctured; disk of propodeum long, shining, with irregular 

 rugae not reaching the apex, which is polished; mesopleurae shining, 

 dehcately punctured; truncation not sharply defined, but distinct 

 laterally; tegulae very pale, impunctate. Abdomen slender, the 

 only punctures piliferous; bases of segments clothed with rather 

 sparse hairs; apical margins very pale testaceous. Wings clear; 

 anterior wing 4 mm. long; stigma and nervures testaceous; second 

 submarginal cell higher than broad, receiving the first recurrent 

 nervure near the apex; third submarginal little broader than high, 

 contracted above, about equidistant with the second on the marginal. 

 Legs yellow- testaceous; the femora and tibiae somewhat darker; 

 pubescence dull white. 



Habitat. — Las Cruces, New Mexico, October 12 (Cockerell). 



Type.— Cat. No. 26423,U.S.N.M. 



