2o8 ENTOMOLOGICAL NEWS [May, '13 



Halictus tenuis sp. nov. 

 9. — Length, 5 mm. A small slender species, metallic blue through- 

 out. Facial quadrangle a little broader than long, clypeus short but 

 distinctly produced, face finely and very closely punctured, opaque ex- 

 cept on the almost impunctate f rons and on the clypeus ; flagellum 

 tinged with yellow below. Pleurae rather coarsely but not sharply 

 roughened, metapleurae with five or six, very weak plicae near the up- 

 per end ; mesonotum almost opaque with fine scattered punctures and 

 very sharp, rather coarse lineolations ; median groove deep, parapsidal 

 grooves not developed. Basal area of the metathorax, almost as broad 

 as the scutellum, the margin rounded, a little elevated near the middle; 

 the surface sharply lineolated. a few very weak, irregular, reticulate 

 rugae near the base, the middle one straight, and somewhat stronger. 

 Tegulae brown in the middle, almost hyaline at the edge. Wings light 

 brownish hyaline, third submargmal cell almost twice as wide as the 

 first; stigma dusky honey color, nervures darker, costal nervure dark 

 brown. Legs black, tarsi dark testaceous. Abdomen shiny, with very 

 fine scattered punctures and very fine lineolations, margins of the 

 segments testaceous. Pubescence scant except around the anal rima 

 and on the legs ; pale gray below, faintly buffy above. 



Hab. Sugar Loaf Mountain, Colorado, altitude 8,500 ft. one 

 (= type) 5 mm. long, May 18, 1907 (S. A. Rohwer). 



This species is much like H. zrc/anus CkW., from which it 

 differs in being blue, not green, and in having no distinct rim 

 around the basal area of the metathorax ; it also resembles 

 //. pruinosiforwis Cvawi. from which the well-separated, finer 

 punctures, and the sharper, more distinct lineolations of the 

 mesonotum. and the very weak rugae of the basal area of the 

 metathorax, distinguish it. 



Halictus umbripennis sp. nov. 

 9 .^Length, 7 mm. Head and thorax metallic, olive green, abdomen 

 quite as metallic, but more brown. Facial quadrangle as broad as lone, 

 somewhat shiny, although finely and closely punctured; clypeus only a 

 very little produced, its apical two-fifths purplish black; flagellum not 

 conspicuously colored below; cheeks shiny, the punctures fine and 

 scattered. Mesothorax shiny throughout; median groove of the meso- 

 notum deep in front, but scarcely evident behind the tegulae. parapsidal 

 grooves distinct but not deep; disc with very fine scattered punctures 

 (not quite so smooth as H. sethyrus Sm.). and with microscopic line- 

 olations; scutellum almost impunctate; postscutellum closeiy punctured. 

 Metathorax without a salient rim, broadly rounded from above down- 



