538 Mr. T. D. A. Cockerell — Descriptions and 



01(1 World species, it shows a general resemblance to 

 JS. Siiccincta, Panz. 



Hah. Boulder, Colorado, on the campii? of the University 

 of Colorado, at flowers of Taraxacum taraxacum^ in company 

 with N. cuneata, Rob., Osniia, &c., April 10, 1907. 

 Collected by Miss Edna Baker. 



Osmia gaudiosa^ sp. n. 



^ . — Length 6 mm. or slightly over. 



Brilliant golden green, including legs ; the vertex, front, 

 and thorax above with a strong suffusion of coppery-red or 

 almost crimson ; abdomen with strong reddish-golden tints ; 

 hair of head and thorax long and white ; antennte normal, 

 slender, not moniliform, black with a slight brown tint ; 

 tegulffi bright green, shining golden ; wings clear. Abdomen 

 strongly punctured, its hair white ; first ventral segment 

 feebly subemarginate ; second ventral peacock-green ; sixth 

 dorsal with a very feeble median depression, hardly emar- 

 gination ; seventh segment bidentate. 



Hah. Boulder, Colorado, on the campus of the University 

 of Colorado, at flowers of Taraxacum taraxacum, April 10, 

 1907 [Edna Baker). 



A most lovely little species, very distinct from all others 

 in North America. 



Osmia universitatis, sp. n. 



(J . — Length about 9 mm. ; anterior wing about 7. 



Head and thorax olive-green, some brassy colour on middle 

 of front, metathorax bluish green ; abdomen dark green, 

 approaching bluish green, the hind margins of the segments 

 narrowly purplish black ; legs black, with no metallic tints. 

 Head and thorax very densely punctured as usual, their hair 

 long and abundant, dullish, with a yellowish tinge, but over 

 clypeus forming a dense shining white beard ; no black or 

 dark hairs intermixed anywhere ; antennae long and slender, 

 black, the flagellum obscure ferruginous beneath, not monili- 

 form ; tegulee black. Wings hyaline, very clear; b. n. 

 falling just short of t.-m. ; hair of legs mostly pale, but 

 black or dark fuscous on basitarsi (redder within), and the 

 hind tibiae have long black hairs on outer side, while the 

 hind femora show short black hair, easily overlooked because 

 of the longer pale hair. Hair of abdomen partly black on 

 fourth and following segments ; sixth segment entire ; 

 seventh bidentate, the points quite wide apart ; first ventral 

 entire, third deeply emarginate. Eyes slate-colour. Second 

 and third joints of middle tarsi broadened and thickened. 



