Robertson — North American Bees. 323 



long, strongly retracted, sharply truncate, the truncation sub- 

 cordate; disc with irregular raised lines reaching the apex; 

 wings hyaline, nervures, stigma, and tegulae exteriorly pale 

 testaceous; legs black or dull ferruginous, pubescence pale; 

 hind spurs with about three long teeth ; abdomen black, with 

 slight metallic reflection, shining, segments one and two 

 minutely punctured basally, a triangular patch on each side 

 of base of second, and third and fourth segments clothed 

 with rather close pale pubescence; margins of segments not 

 testaceous. Length 7 mm. 

 Illinois; two 5 specimens. 



Halictus testaceus $. 



Head and thorax greenish; apex of clypeus, labrum, man- 

 dibles, except base, fiagelluin beneath, nervures, stigma, 

 tegulae, knees, tibiae, except blotches on middle, tarsi and 

 abdomen entirely pale testaceous ; face finely and densely 

 punctured, clypeus purplish, more sparsely and coarsely punc- 

 tured ; mesonotum shining, minutely roughened, with minute 

 sparse punctures; metathorax shining, strongly retracted, 

 sharply truncate, posterior face subcordate, disc finely longi- 

 tudinally roughened; hind spurs with about three long teeth ; 

 abdomen shining, with shining margins of segments, impunc- 

 tate, clothed with thin, pale pubescence, which is more abun- 

 dant towards apex. Length 5 mm. 



Illinois; two £ specimens. 



AUGOCHLORA Sill. 



Augochlora pura Say. 



Halictus purus Say, Bost. Journ. I, 395, ?^, 1837, Lee. Edit. II. 773. 



Augochlora pura Smith, Brit. Mus. Cat. Hym. I, 82, 1853. 



Augochlora pura Provancher, Nat. Can. XIII, 206, 9, 1882. 



Atigochlora pura Provaucher, Faun. Ent. Can. Hym., 706, 9i 1883. 



Augochlora labrosa Robertson, Trans. Am. Ent. Soc. XX, 146, 9d\ 1893. 



Augochlora robertsoni Cockerell, Can. Ent. XXIX, 69, 1897. 



g. — Green, reflecting bluish or purplish ; abdomen shining, 

 more evidently tinged with brassy or cupreous ; head densely 

 and finely punctured, clypeus coarsely and more sparsely 

 punctured, anterior margin black; eyes deeply and rather 

 acutely emarginate; process of labrum subquadrate; middle 



