24 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.65. 



of a puncture apart; median and parapsidal grooves indistinct; punc- 

 tation of scutellum similar to that of the mesothorax; disk of pro- 

 podeum crescentic, dull, finely roughened, rugose at the base only; 

 mesopleurae punctate; truncation distinct laterally; tegulae dark, 

 opaque, coarsely punctured. Abdomen ovate; without distinct hair 

 bands, but segments clothed with quite sparse dull white hairs; apical 

 margins of segments polished, dark testaceous. Wings yellowish; 

 anterior wing 2.75 mm. long; stigma and nervures pale testaceous; 

 second submarginal cell higher than broad, receiving the first recur- 

 rent nervure near the apex; third submarginal about one and one-half 

 times as long as the second on the marginal. Legs black, with 

 rather sparse pubescence ; tarsi reddish. 



Habitat. — Crook, Colorado, August 29, 1920 (Sandhouse). 



Type.— Cat. No. 2G419, U.S.N.M. 



HALICTUS ( CHLORALICTUS) EXALBIDUS. new species. 



Male.— About 5 mm. long; brilliant blue; pubescence pruinose, 

 abundant. Facial quadrangle about as broad as long; face with 

 long plumose hairs; orbits converging below; second and third 

 antennal joints of equal length, flagellum rufo-testaceous, paler 

 beneath; front with close, deep punctures above the antennae, more 

 sparse below; supraclypeal area and clypeus largely blue, more deli- 

 cately punctured; the line between the clypeus and supraclypeal area 

 very faint. Mesothorax shining, coarsely punctured; median and 

 parapsidal grooves distinct, but not deeply impressed; punctation of 

 scutellum similar to that of the mesothorax; metathorax shining, 

 punctate; disk of propodeum small, semicircular, with a polished 

 inclosing rim, sliining, with irregularly Avrinkled rugae; mesopleurae 

 coarsely punctured; sides of propodeum punctured, the punctures 

 extending up to the edge of the disk; truncation distinct laterally, 

 but not sharply defined; tegulae very clear, honey color, impunctate. 

 Abdomen narrowly ovate, segments punctured to the extreme apical 

 margins, which are testaceous. Wings clear; anterior wing 3.5 mm. 

 long; stigma and nervures honey color, except the subcosta and the 

 costa beyond the stigma, which are testaceous; second submarginal 

 cell higher than broad; first recurrent nervure joining second trans- 

 verso-cubital; third submarginal somewhat broader than high, gently 

 contracted above, about three times as long as second on the mar- 

 ginal. Legs dark, with knees reddened; tarsi testaceous. 



HaUtat.—SantG Fe, New Mexico, August, No. 4228 (Cockerell). 



Type.—Csit. No. 26420, U.S.N .m'. 



Differs from alboJiirtus Crawford'^b}^ the more closely punctm*ed 

 mesothorax; sculptm'ing of the disk][of propodeum; broader head. 



From pruinosiformis Crawford by the reddened flagellum; more 

 sparse pubescence; broader head. 



