ART. 19. iMEEICAN BEES OF THE GENUS HALICTUS — SANDHOUSE, 37 



third joints of equal length; flagellum testaceous beneath; lower half of 

 clypeus black. Thorax with quite dense, short hairs; mesothorax 

 shining, with faint microscopic lineolations, coarsely and deeply 

 punctured, the punctures about twice as far apait on the disk; 

 punctation of the scutellum similar to that of the mesothorax, two 

 large, sliining spots on the disk; disk of propodeum subcrescentic, 

 shining, with coarse, irregular rugae extending over the margin and 

 covering the sides of propodeum; mesopleurae with coarse, shallow 

 punctures; truncation sharply defined laterally; tegulae honey color, 

 impunctate. Abdomen ovate, shining, very sparsely pubescent; 

 segments 1-2 delicately punctured; apical margins of segments 

 polished, dark testaceous. Wings clear; anterior wing 4 mm. long; 

 stigma and nervures very pale testaceous; second submarginal cell 

 considerably higher than broad, receiving the first recurrent nervure 

 near the apex; third submarginal higher than broad, about twice as 

 long as the second on marginal, receiving the second recurrent ner- 

 vure near the apex. Legs shining, black, with moderately close hairs; 

 knees, tips of tibiae, and tarsi ye low. 



Habitat. — Colebrook, Connecticut, September 1-7 (W. M. Wheeler). 



Type.— C&t. No. 26439, U.S.N.M. 



Differs: From hortensis Lovell by the larger size; narrower face; 

 clear wings; more abundant pubescence; sculpturing of the disk of 

 propodeum. 



From nevadensis Crawford by the narrow face; paler flagellum and 

 tegulae; clear wings; sculpturing of the disk of propodeum; broader, 

 polished abdomen; knees red; tarsi clear yellow. 



HALICTUS (CHLORALICTUS) MACTUS, new species. 



Male. — About 5 mm. long; head and thorax dark blue-green; face, 

 mesothorax, scutellum, and mesopleurae with a brassy tinge; abdo- 

 men black; pubescence white. Facial quadrangle little longer than 

 broad; orbits converging slightly below; face shining, sparsely pu- 

 bescent; front closely punctured, the punctures more scattered and 

 shallow below; antennae dark, second and third joints of equal 

 length; flagellum testaceous beneath; lower half of clypeus shining 

 black, sparsely punctured. Thorax with short, rather dense pubes- 

 cence; mesothorax polished, with deep punctures a little more than 

 the diameter of a puncture apart; punctation of scutellum much like 

 that of the mesothorax, two smooth spots on the disk; metathorax 

 shining, punctured; disk of propodeum dark blue, long, inclosed pos- 

 teriorly by a low rim, with very irregular, discontinuous rugae; meso- 

 pleurae shining, coarsely punctured; truncation well defined laterally; 

 tegulae red-testaceous, impunctate. Abdomen narrowly ovate; seg- 

 ments except for a very narrow, polished apical margin, with delicate, 

 piliferous punctures and short hairs. Wings clear; anterior wing 



