Pomona College, Claremont, California 49 
forming felt-like hair-bands on abdomen, weak on first segment, 
but broad and conspicuous on 2 to 4; hair at apex of abdomen very 
pale ochreous; mesothorax with thin felt-like pale ochreous hair, 
and a few long hairs intermixed; facial quadrangle broader than 
long; mandibles black; process of labrum deeply emarginate; facial 
fovee light, with a slight ochreous tint; more than half as wide as 
distance from antenna to eye; apical two-thirds of flagellum bright 
red beneath; mesothorax dullish, granular; area of metathorax 
delicately plicatulate; tegule rufopiceous; wings faintly dusky; stig- 
ma dusky ferruginous, small and narrow; legs with white hair, hind 
tibia with a broad loose scopa; tegument of legs black; abdomen 
looking like that of the group of Halictus including H. provancheri. 
Habitat: Claremont, California (Baker; Pomona coll. 216). 
A pretty little species, allied to the next, but easily known by the 
dullish fasciate abdomen. 
Diandrena cyanosoma sp. n. 
@ (Type.) Length about 8 mm.; head olive green, thorax and 
abdomen blue green, the abdomen almost blue; clypeus black, with 
the upper and lateral margins green, the junction of the black and 
green suffused with purple; mandibles black; pubescence dull whit- 
ish; slightly ochreous on head and thorax above, fuscous or black 
just behind ocelli and more or less on front, and long dark hairs 
on scape; process of labrum narrow, emarginate; antenne dark, 
the flagellum only very obscurely reddish toward end; facial fovee 
pale, quite broad; mesothorax dull and granular, with short hair, 
and some long ones intermixed; scutellum rugosopunctate, but 
glistening anteriorly; area of metathorax roughened with very 
delicate ruge ; femora olive-green; tibie and tarsi black; hind tibie 
with a long glistening pure white scopa beneath, but fuscous hair 
above (behind), and hind knee-tuft grayish fuscous; hind tro- 
chanters with a long white curled floccus; tegule piceous; wings 
dusky, stigma dark reddish, rather small; abdomen broad, without 
any distinct hair-band, though the fourth segment has a thin fringe; 
hair at apex soot-color. 
é More slender, with the usual sexual differences. Clypeus 
and middle of face densely covered with long white hair, but some 
