9^ ENTOMOLOGICAL NEWS [Mar., '14 



Pleurae opaque and punctured but without coarse sculpture. Meta- 

 pleura with very weak cross plicae throughout its length. Mesonotum 

 finely lineolate, the fine sharp punctures scattered in the middle but 

 very close and crowded on either side and in front of the distinct 

 parapsidal groove and along the posterior margins. Scutellum with a 

 sharp, closely punctured median groove. Truncation of the meta- 

 thorax with a salient rim, the surface with numerous weak striae 

 radiating upward and outward from the center of the base; basal 

 area without a rim, the edge lineolate, rounded and elevated in the 

 middle, central plica a little stronger than those immediately on either 

 side of it and appearing as a stem from which the others branch off 

 at right angles, plicae at the sides strong and continued over the 

 sides of the segment. Tegulae shiny, reddish brown, paler in front. 



Wings a little brownish; stigma and nervures light brown, costal 

 nervure darker. 



Legs entirely black, with rich golden brown pubescence. 



Abdomen broad ; finely punctured throughout ; apical margin of the 

 segments broad, finely lineolate, not paler than the rest of the segments, 

 discs of the third to fifth segments and sides of the first and second 

 segments with scant yellowish pubescence. 



Pubescence rather scant throughout, ochraceous above, paler be- 

 neath. 



Habitat. Boulder, Colorado, i (type) at flowers of Pulsa- 

 tilla hirsutissima (Pursh) Britton, April 13, 1913 (M. D. 

 Ellis.) 



This species is closely related to H. versatus Robertson and 

 H. euryceps, as is shown by the type of the metathorax and 

 the crowding of the punctures of the mesonotum about the 

 parapsidal grooves. It is distinguished from both of these 

 species by the produced clypeus and the longer face, by the 

 metallic reflections on the abdomen and by the wholly black 

 legs. 



Halictus euryceps sp. nov. 



9 Length 7 mm. Head and thorax dark blue green or greenish 

 blue, abdomen dark brown to nearly black. 



Head broad, face round, a little broader than long, with strong 

 close punctures and sharp lineolation ; clypeus not produced. An- 

 tennae entirely blackish brown. 



Mesonotum opaque, with fine scattered punctures, becoming crowded 

 in the area just to either side of the parapsidal grooves and along the 

 posterior margin, finely and sharply lineolate. Disc of the metathorax 

 with a low, sharp rim on either side below; basal area entirely without 

 a rim, with relatively few, simple plicae usually reaching the margin 



