Pomona College, Claremont, California 47 
segment depressed about a fourth; hair at apex reddish-black; ven- 
tral segments with long fringes of stiff black hairs. 
Habitat: Claremont, California (Baker; Pomona coll. 199). 
This may be compared with 4. nigerrima Casad, from which it is 
readily known by the non-punctate abdomen and other characters. 
A related but much larger species of the Los Angeles region is 
A. subtristis Ckll. This, according to Mr. Viereck, is a synonym 
of dA. nigra Proy., and the specimens in the National Museum 
labeled nigra are this species. There is, however, some confusion, 
since Provancher’s description indicates a smaller species (length 
.42 inch), with a smooth line in middle of clypeus (wholly wanting 
in subtristis, but present in the much larger pertristis Ckll.), wings 
smoky reddish (like pertristis rather than subtristis), and abdomen 
oval and brilliantly polished. This indicates a species unknown to 
me. 
Andrena auricoma Smith 
Claremont (Baker; Pomona coll. 197). Smaller than an Ore- 
gon specimen. A. candida Sm. was also taken by Baker at Clare- 
mont (Pomona coll. 198). 
Andrena plana Viereck 
Claremont (Baker; Pomona coll. 212). This is a little larger 
than Viereck’s type, but is presumably his plana, having the very 
remarkable brownish velvet-like hair on thorax above, and the dull 
impunctate clypeus. The second abdominal segment has no apical 
depression. Superficially the species resembles 4. mustelicolor 
Vier., but it is easily separated by the thoracic hair. 
Andrena opaciventris sp. n. 
@ Length about 10 mm.; black, with fulvous hair, bright fox- 
red on thorax above; face and front with much fulvous hair, so that 
the dull granular surface of the clypeus is difficult to see; mandibles 
black, with a red spot at extreme base; process of labrum narrow at 
end, minutely notched; facial fovee grayish-brown, about half as 
wide as distance between antenna and eye, difficult to see on account 
of the long overlapping hair; antenne black, third joint 368 microns 
long, the next two together 384 microns; mesothorax and scutellum 
