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



scopa entirely pale yellow or (var. a) dark fuscous, sLining 

 yellowish in certain lights ; head broad ; hair of head and 

 thorax white, nowhere mixed with black or fuscous, but 

 that on vertex distinctly brownish, that on face slightly 

 brownish, and that on lower edge of clypeus shining pale 

 golden; antennse black; tegulte purple, punctured near 

 margin ; femora^ tibiae, and hind basitarsus in part purple 

 or green. Wings very dusky ; first r. n. joining second 

 s.m. far from base ; abdomen short and broad, densely 

 punctured. 



^ . — Length about 6 mm. 



Brilliant peacock-green ; pubescence all white ; flagellum 

 very obscure brownish beneath ; sixth abdominal segment 

 feebly notched, seventh bidentate ; first ventral entire ; 

 hind basitarsus with a small tooth about 270 ix from end. 



Hab. Type female from mountains near Claremont, 

 California [Baker) ; others ( (^ ? ) from same locality, and 

 female var. a from Claremont {Baker). 



Compared with the female ascribed to O. ednce, the present 

 species differs at once by its minutely granular (finely 

 punctured) abdomen, which is accordingly duller, though 

 very brilliantly coloured. The male is a l)luer green tiian 

 that of 0. kincaidii, being covered like the klncaidii female. 

 The abdomen of the male is brilliantly shining. 



Chelynia suhceerulea (Cresson). 



Cresson 'described this from a single male collected in 

 California. In his catalogue published in 1887 he recorded 

 it, possibly by mistake, as from Colorado and Nevada. A 

 female from Ormsby County, Nevada {Baker), is quite as 

 this sex of subccErulea might be expected to be, except for its 

 small size, length about 6^ mm. The size of bees of this 

 group is very variable, and no doubt this Nevada female is 

 merely an unusually small specimen. The pubescence of 

 the head and thorax is mixed black and pale, the black or 

 dark fuscous preponderating. The ivory-coloured abdominal 

 bands are reduced to a pair of widely separated short stripes 

 on the second and third segments, and larger markings, 

 clavate laterad, on the first ; the fourth segment is wdthout 

 light markings. The strong punctures on the disc of meso- 

 thorax are more widely separated than in C. elegans. 

 Cresson states that C. subc(srulea is larger than C. elegans, 

 but 1 believe both vary in size, with probably little or no 

 difterence. C. elegans has the thorax more densely punc- 

 tured, and is perhaps confined to the Kocky Mountains, 

 although Cresson in 1878 incidentally refers to its occurrence 

 iu California. 



