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 

 fovese 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; tegulee 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. 



5 (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; antennae dark, 

 the flagellum only very obscurely reddish toward end; facial foveae 

 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 ruga?; femora olive-green; tibia? and tarsi black; hind tibia? 

 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; tegula? 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. 



$ More slender, with the usual sexual differences. Clypeus 

 and middle of face densely covered with long white hair, but some 



