766 ^Ii'. T. D. A. Cockeiell — Descriptions and 



Related to O.fulyida, Cresson, which has a larger female, 

 and in the male has the broad seventh segment evidently 

 pointed. Also closely related to O. viridimicans, Ckll., 

 which is much larger ; they agree in having the lower part 

 of metathoracic area smooth and shining. In female viridi- 

 micans the pubescence is entirely black, in platyiira it is 

 various shades of fuscous, sometimes rather pale. These 

 insects are intermediate between Osmia and Monumetha. 



Osmia regulina, sp. n. 

 ? . — Length about 8 mm. 



Robust, with subglobose abdomen ; brilliant green, suffused 

 with blue and purple ; head large, face broad, with fine 

 white downy pubescence and longer slightly brownish hairs ; 

 hair of head and thorax white, the long dorsal hairs some- 

 Avhat fuscous or yellowish ; clypeus and adjacent sides of 

 face purple, the lower margin of clypeus black ; scape black, 

 flagcilum dark reddish beneath ; raesothorax densely con- 

 fluently punctured ; tegulse punctured, green, with a dull 

 fuscous spot ; area of metathorax granular. Wings very 

 dusky, b.n. meeting t.-m. ; first r. n. joining second s.m. far 

 from base, marginal cell comparatively short. Legs black, 

 with the femora largely green and the tibise purplish; hair 

 on inner side of hind tarsi black. Abdomen dorsally with 

 scanty pale hair, rather greyish on basal part of segments ; 

 apical segment fringed with dark greyish hair; ventral seo})a 

 black. 



fj . — About 7 mm. long. 



Blue-green, some greener, others bluer ; hair of face long, 

 entirely white ; flagellum variably redilish beneath; teguhe 

 and legs green ; sixth abdominal segment with a small 

 notch, seventh bidentate ; first ventral truncate, entire. 



Hab. Type ( ? ) from Claremont, California [Baker). 

 ]\Iales from Claremont and the adjacent mountains {Baker). 



Very close indeed to O. kincaidii, Ckll., but distinguished 

 in the female by the paler pubescence, the continently punc- 

 tured mesothorax, and the less metallic legs. The male is 

 bluer, with the hair above hardly ochreous. The male is 

 also close to O. edncB, Ckll., but tlie latter is rather larger, 

 of a brighter j'cllower green. In the greenest males of 

 O. regulina the hind margins of tiie segments are blue-green 

 and the surfaee-sculptuie of the segments is quite coarse. 



Osmia ednce, Cockerell. 

 .Males from Claremont and the adjacent mountains and 

 a female from Claremont [Baker) can duIv be referred here. 



