2QO ENTOMOLOGICAL NEWS [Dec., '19 



Halictus glaucovirens n. sp. 



2. Like //. pruinosiformis Crawf.. but head elongated as in H. 

 pniiiwsus Rob., from which it differs by the darker flagellum, and 

 more strongly and less densely punctured mesothorax, with a shining 

 sparsely punctured area on each side of the middle. The insect is 

 glaucous green, with pure white pubescence ; wings hyaline, stigma 

 pale yellowish, subcostal nervure black. The thorax is not so robust 

 as in pruinosus. 



Longs Peak trail, above timber line, July 20, 1919 (Cock- 

 er ell.} 



Halictus hudsbniellus n. sp. 



9. Length about 5 mm.; slender, with unusually pointed abdomen; 

 head and thorax olive-green, the scutellum and mesopleura more glau- 

 cous green: labrum and apical half of mandibles red; flagellum strongly- 

 reddened except at base' pubescence pure white; legs black, with the 

 knees, tibiae at apex and the tarsi reddened ; tegulae yellowish testa- 

 ceous ; wings hyaline, stigma and nervures testaceous, subcostal ner- 

 vnre black; arHomen apricot-color, shining, the third and following 

 segments pruinose with white hair. Head subcircular; front shining; 

 mesothorax dullish, finely punctured; scutellum shining; area of meta- 

 thorax appearing minutely granular, but under compound microscope 

 showing irregular vermiform anastomosing raised lines; the meso- 

 thorax posteriorly is more or less (microscopically) transversely sul- 

 catulate: hind spur with four large spines. 



Longs Peak trail, Hudsonian Zone, July 22 (Cockerell}. 

 The altitude of the locality is probably about 10,500 feet. 



Related to H. scrophulariae Ckll., but smaller, and easily 

 separated by the red labrum, much redder antennae, abdomen 

 more hairy on apical parts with the surface of fourth and 

 fifth segments darkened under the hair. From H. clemati- 

 sellns Ckll. it is known by the much more hairy abdomen. 

 The head is not nearly so broad as in H. clarissimus Ellis. 



Halictus sp. L. P. T., 1 $, at Scnccio (IV. P. C.}. An un- 

 described male which I cannot clearly associate with any known fe- 

 male ; it is perhaps a new species. It is a small Chloralictus with olive- 

 green mesothorax, black abdomen, and pale testaceous stigma. 



Halictus viridatulus n. sp. 



9 . Like H. riridatits Lovell, with the same highly characteristic 

 radiating plicae on area of metathorax, though these are not quite so 

 strong. It differs from //. riridatus by the dusky stigma and entirely 



