AET. 19. AMEEICAN BEES OF THE GENUS HALICTUS — SANDHOUSE. 21 



submarginal sharply contracted above and little longer than second 

 on the marginal. Legs black, with quite abundant yellowish hairs; 

 hind spur pectinate with three moderately long teeth. 



Habitat. — Colorado Springs, Colorado, April 20, at flowers of willow 

 {W. P. Cockerell). 



Type.— Cat. No. 26414, U.S.N.M. 



Distinguished from other CMoralictus by the broad head; and from 

 unicus by the reddish tegulae, olive-green mesothorax, hind spur with 

 three teeth, darker stigma and nervures. 



HALICTUS (CHLOKALICTUS) UNICUS. new species. 



Female. — About 6,5 mm, long; head and thorax dark blue-green; 

 abdomen black; pubescence largely dull white. Facial quadrangle 

 about as broad as long; orbits converging below; face covered with 

 moderately dense pubescence; front with close shallow punctures; 

 sides of face and supraclypeal area microscopically lineolate, with deep 

 scattered punctures; clypeus largely shining black, with few very 

 coarse punctures, fringed with yellowish hairs; antennae dark, flagel- 

 lum reddened beneath, especially apically. Thorax clothed with 

 abundant white pubescence; mesothorax broad, microscopically line- 

 olate, with coarse scattered punctures; scutellum sculptured similarly 

 to the mesothorax, two large polished spots on the disk; disk of pro- 

 podeum crescentic, without an inclosing rim, with few coarse plicae, 

 plicae somewhat wrinkled, especially on the median portion; trun- 

 cation distinct laterally; tegulae pale testaceous, impunctate. Ab- 

 domen broadly obovate, impunctate; first abdominal segment as broad 

 as second; segments 1-2 shining, almost without pubescence; seg- 

 ments 3-5 clothed with dense subappressed yellowish white hairs. 

 Anterior wing 5 mm. long; wings clear; stigma and nervures honey 

 color; second submarginal cell higher than broad, scarcely contracted 

 above, receiving the first recurrent nervure very near the apex; third 

 submarginal very gently contracted above, about twice as long as 

 second on marginal. Legs black, with dense dull white hans; hind 

 spur pectinate with four moderately long teeth. 



Habitat. — Seven miles east of Vinton, Iowa, June 29, 1922 (Sand- 

 house), 



TVpe,— Cat. No. 26415, U,S,N,M, 



Easily distinguished from other CMoralictus by the broad head, and 

 from latus by the paler tegulae and nervures; blue-green mesothorax; 

 hind spur with four teeth. 



HALICTUS (CHLORALICTUS) ABSIMILIS, new species. 



Female. — About 6 mm, long; head and thorax blue- green; abdomen 

 black; pubescence white. Facial quadrangle longer than broad; 

 inner orbits converging below; front above the antennae with close 



