126 Mr. T. D. A. Oockerell — Descriptions and 



The stipites of 0. integrella are divided at the end into a 

 brush of bhack hairs and a divergent long, linear, corneous 

 process. 



Hah. Campus of University of Colorado, Boulder, Colorado, 

 at flowers of Taraxacum tara.vacian, May 8 [Edna Baker). 



Osmia Ramaleyi, sp. n. 



^ . — Length about 7^ mm. 



Head olive-green, the front almost golden ; thorax above 

 yellowish green, at sides bluish green ; the metathorax blue, 

 contrasting with the green scutellum and postscutellum. 

 Abdomen a sort of Prussian green or greenish blue. Legs 

 greenish blue, but the anterior legs black in front ; tegulai 

 green. Wings clear, with only a very faint duskiness, the 

 liind margin no darker than the rest. Hair of head and 

 thorax long and white (not oclireous above), very dense on 

 face ; no dark hairs anywhere ; hair of legs white, fulvous on 

 inner side of tarsi ; middle tarsi rather long, slender, the 

 joints normal. Antennae black, the flagellum not moniliform ; 

 third joint shorter than fourth. Abdomen rather coarsely 

 sculptured; hind margins of segments concolorous with the 

 rest ; sixth segment with a broad, very shallow emargination ; 

 seventh strongly bidentate ; first ventral truncate. Hair on 

 abdomen above white, without any black. 



In the table of Boulder County species this runs to 

 0. j)7'0xima, Cresson, which is, however, much smaller and 

 otherwise different. There is a good deal of resemblance to 

 O. ab'iventris, Cress., but the green teguke and the structure 

 of the sixth abdominal segment are distinctive. 0. Wheeleri 

 lias the legs much less metallic, the tegulai reddish in the 

 middle, and, especially, the teeth of the seventh abdominal 

 segment very much larger and triangular. 



Hah. Campus of University of Colorado, Boulder, Colorado, 

 at flowers of Tara.vacum taraxacum, May 10 {Edna Baker). 



Named after Professor Francis llamaley, of the University 

 of Colorado, in recognition of his work on the natural history 

 of Colorado. 



Since the above was written, on May 21, Mrs. C. Bennett 

 has taken at Boulder 2 ? and 1 (^ of 0. Ramahi/i, all at 

 flowers of Astragalus gomatus, Nuttall. The male is exactly 

 like the type, except that the first ventral segment is very 

 distinctly emarginate. This character is considered by 

 llobertson to be of generic value, but after minutely com- 

 i)aring every part of the two bees I am sure that they are of 

 the same species. The female has an orange scopa and is 



