Halictus robustus n. sp- 



Black, shiny, especially the abdoinen. very robust; facial qnadningle 

 broader than long, face above antennae <dosely ratlior finely pnuctured, 

 below more coarsely obliquely so; dypeus smooth, shiny, sparsely 

 punctured; a-nteunae dark; pubescence of head and thorax abundant, 

 distinctly oehraceous; thorax (dosely ami rather finely punctured, shiny, 

 not lineolated; median and parapsidal jjrooves well impressed; trunca- 

 tion of metathorax not surrounded by a salient rim; surface of 

 truncation finely liueolate an 1 with scattered pun^ctures; meta^pleurae 

 finely lineolate and with a few pninctures. at the upper posterior angiles 

 finely roughened; ])a.se of metathorax narrow, finely longitudinally 

 wrinkled to apex, not enclosed but set off from the pleurae by an 

 angle; mesopleurae ru.gos.>punctafce; teg.iilae black with a red center; 

 wings slightly yellowish and slightly dusky at apex, nervures anrl 

 stigma almost honey color; second snbmarginal cell almost as long as 

 third, the latter narrowed about onethird to marginal; legs black, 

 pubesceni'e oehraceous, hin<l inner spur with about 6 broad, blunt 

 saw.like teeth; abdon'<>n finely closeiiy punctured, including the first 

 segment; apical margins of segments narrowk^ testaceous, base^s of 

 segments 2-4 with bands of ap])resised slightly oehraceous pubescence; 

 base of segment 1, apical nargins of 2-3 and 4 and 5 entirely thinlv 

 covered with oehraceous pubescence Length 9i.j mm. 

 Olaremont Calif. (Baker.) 



Tn general appearance like the arcnatus group, but tlie closely 

 punctured first abdominal segment separates it from all of them. This 

 is an Eri/laevfi. 



4 689 Halictus nigrescens n. sp. 



Black, head and thorax closely and finely punctured, finely lineolate. 

 dull; thinly covered with whitish pubescence sjightly oehrac-eous on 

 dorsum of mesothornx; f acini quadrangle biroader than long; punctures 

 above antennae crowded; antennae dull reddish beneath toward apex; 

 median groove deeply impressed, parapsidal grooves distinct; truncation 

 of metathorax surrounded by i\ cordate rim reaching beyond upper 

 lateral angles but very faint above medially; disc of metathorax shiny, 

 slightly irregularly wrinkled, wrinkles reaching apex, the surface 

 somewhat roughened; wings slightly dusky, nervures and stigma ho- 

 ney-color; second submarginal fully as long as third, the latter narrowed 

 about one-third to maginal; tegulae large, dark, with a light center and 

 a broad hyaline border; lega dark, apical joints of tarsi reddish, hind 

 inner spur with about four rather short teeth; abdomen shiny, 

 transversely lineolate, depres.sed apical margins of segments broadly 

 testaceous; segment 1 sparsely finely puuct'ared. base-s of. other se.gmeiit 



