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 A. 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 

 .-/. siihtristis Ckll. This, according to Mr. Viereck, is a synonym 

 of A. nigra Prov., and the specimens in the National Museum 

 labeled nigra are this species. There is, howev^er, 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 pcrtristis Ckll.), wings 

 smoky reddish (like prrtristis rather than snbtristis), 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 A. miistelicolor 

 Vier., but it is easily separated by the thoracic hair. 



Andrena opaeiventris 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 fovea? grayish-brown, about half as 

 wide as distance between antenna and eye, difficult to see on account 

 of the long overlapping hair; antennae black, third joint 368 microns 

 long, the next two together 384 microns; mesothorax and scutellum 



