ART. 19. AMERICAN BEES OF THE GENUS HALICTUS SANDHOUSE. 39 



Thorax with rather dense pubescence; mesothorax polished, closely 

 punctured, the punctures about the diameter of a puncture apart 

 except on the disk where they are about twice as far apart; punc- 

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

 propodeum dark green, subcrescentic, shining, with coarse plicae 

 reaching the apex, inclosed by a low, irregular rim; truncation 

 distinct laterally; tegulae very pale testaceous, impunctate. Abdo- 

 men ovate, shining; apical margins of segments polished; bases of 

 segments with delicate piliferous punctures, clothed with short hairs. 

 Wings clear, faintly yellowish; anterior wing 4.5 mm. long; stigma 

 and nervures pale testaceous; second submarginal cell higher than 

 broad; first recurrent nervure joining the second transverso-cubital ; 

 third submarginal broader than high, contracted above, one and one- 

 half times as long as second on marginal. Legs black; knees, tips 

 of tibiae, and tarsi yellowish. 



Habitat. — Boulder, Colorado, August 1, 1908 (S. A. Rohwer); Uni- 

 versity Campus (Cockerell) (type). 



Type.— Cat. No. 26442, U.S.N.M. 



Differs: From lioriensis Lovell by the larger, more robust size; 

 narrower face; face and mesothorax golden green; flagellum rufo- 

 testaceous beneath; sculpturing of the disk of propodeum; paler 

 wings. 



From nevadensis Crawford by the narrower face; flagellum pale 

 beneath; mandible yellowish; paler tegulae; sculpturing of the disk 

 of propodeum; mesothorax more delicately punctured; knees and 

 tarsi yellowish. 



From disparilis Crawford by the more sharply converging or- 

 bits; face more closely punctured; more delicately punctured meso- 

 thorax; less brassy face and mesothorax; sculpturing of the disk of 

 propodeum. 



HAUCTUS (CHLORALICTUS) MOLLIS, new species, 



Male. — About 5.5 mm. long; head and thorax blue-green; abdomen 

 black; pubescence white. Facial quadrangle longer than broad; orbits 

 converging slightly below; face sparsely pubescent; front closely 

 punctured; the punctures more sparse below; clypeus brassy, the 

 lower one-third black; antennae dark, second and third joints of 

 equal length; flagellum dark, hardly paler beneath; mandibles dark; 

 red at the apex. Thorax with quite dense, long hairs; mesothorax 

 polished; punctures on the mesothorax about the diameter of a 

 puncture apart, more sparse on the disk; scutellum closely punctured . 

 two polished spots on the disk; disk of propodeum long, with irregu- 

 larly anastomosing rugae reaching the apex, which is polished; meso 

 pleurae and sides of propodeum coarsely punctured, brassy; trunca, 

 tion not sharply defined laterally; tegulae very pale; impunctate. 



