Records of Bees. .IG.") 



just like 0. ahiveiitn'sy but is easily separated by the lar;,'e 

 amount of black hair on lieaiL 0. albolateralis, Ckll., is 

 much h\rf2;cr ami has not the fine apprcs.sed white hairs scmmi 

 on abcloHjinal scfrnicnts 4 and 5 '\\\ phacelue. It is an Osmtd 

 s. str. in the sense ot liobertson. 



/lab. AVard, Colorado, July 1905, at flowers of Phncelia 

 ( IF. /'. & T. J). A. Ckll.) ; also one from Boulder, Colorado, 

 June 17, 1905 (IF. P. Cockerelt). 



Osmia Ilendersoni, sp. n. 



? . — Length 10 mm. ; width of abdomen 4|. 



Ivobnst ; head and thorax densely punctured, black, with 

 strong blue and green tints at sides of face, and the pleura, 

 scutellum, and metathorax greenish ; abdomen very short and 

 broad, very shiny, with sparse punctures, the segments olive- 

 green, with the hind margins broadly purple, their extreme 

 edge more or less reddisli. Head rather largo, with broad 

 cheeks, but not otherwise remarkable ; clypous noi'inal, the 

 anterior edge gently concave; mandibles with three large 

 but short teeth ; antenna black; hair of face entirely black; 

 the black hair goes as far back as the ocelli, and behind this 

 the hair of the to]) of the head is all dull white, except at the 

 extreme sides ; cheeks nude ; hair of thorax above entirely 

 yellowish white, of pleura black ; tegulge rufo-piceous. 

 Wrings hyaline with yellow stains; first r. n. joining second 

 s.m. about twice as far from base as second from apex. Legs 

 black, with black hair; anterior tarsi with long pale hair; 

 first abdominal segment with long white hair, the others with 

 rather long black hair; sixth a[)ically with a little reddish 

 appressed hair ; scopa black. 



A beautiful species, separated from 0. nujrijrons by the 

 shining abdomen, the second segment with black hair, <te. 

 The 3-dentate mandibles and long hair of pleura readily 

 sej)arate it from 0. breviliirta. 



Ilab. Arapahoe Peak, Colorado, Sept. 1, 190G {S. A. 

 Rohu-er). 



Named after Judge J. Henderson, who was present when 

 it was caught, in recognition of his work on the Arapahoe 

 Glacier and other contributions to the natural history of 

 Colorado. The locality is high alpine. 



Osmia brevihirta, sp. n. 



?. — Length about 11 mm.; width of abdomen barely 

 over 4. 



Dark blue, with green tints ; tho abdomen brilliant, more 



