North-American Bees. 443 
rather shallow punctures ; metathorax roughened, the trian- 
gular enclosure very ill-defined ; hair of thorax white, black 
on scutellum (except sides) and hind part of mesothorax, 
also black on pleura (except in front) and middle portion of 
metathorax ; hair on legs black, but anterior femora behind, 
hind femora beneath, and hind tibie beneath, each with a 
large amount of shining silvery-white hair ; a little of the 
same hair springs from the keeled lower edge of the middle 
femur; spurs dark brown; tegule shining black. Wings 
faintly dusky; nervures and stigma very dark brown, the 
latter unusually narrow; second submarginal cell nearly 
square, receiving the first recurrent nervure a little beyond 
the middle. Abdomen strongly and distinctly punctured, not 
in the least banded (except to some extent on ventral surface) ; 
white hair long and conspicuous on first segment ; apical 
margin of each dorsal segment covered with erect black 
hair, only noticed on viewing the abdomen laterally ; caudal 
fimbria black ; sides of abdomen with shining white hairs. 
$ —Length about 103 millim. 
Very much more slender ; face black, the clypeus tinged 
with bluish green ; hair of face black, long, a little paler 
below antenne ; antenne wholly black, crenulated ; second 
submarginal cell higher than long; hind femora decidedly 
bluish ; sides of metathorax with black hair. 
Hab. Placita, N. M. (near Las Vegas Hot Springs), 
May 2, 1903, two of each sex (W. P. Cockerell). 
The females were at flowers of Salix, the males at flowers 
of Ribes longiflorum, variety. This splendid species is 
exactly like an Osmia in superficial appearance, and when 
the specimens were caught I had no idea that the females 
did not belong to that genus. Similar species of Osmia are 
common in the same region. ‘The only similar species in 
New Mexico is A. cerasifoliz, but A. mimetica is quite distinct 
from that and from all described species. 
Andrena pluvialis, Ckll. 
g .—Like that of A. carlini, but more robust; first joint 
of flagellum somewhat longer; abdomen with a good deal 
of black hair, especially beneath; hair on inner side of 
tibiz and tarsi sooty with a sort of purplish tint; second 
submarginal cell much larger. 
Hab. Placita, N. M., April 25, 1903, both sexes at flowers 
of wild plum (W. P. & T. D. A. Cockerell). 
New to New Mexico. Also found at Placita on the same 
day were Andrena erythrogaster (Ashmead), common at 
