Robertson — North American Bees. 347 



OsMiA Panz. 



OSMIA ATRIVENTRIS CreSS. 



Osmia atriventris Cresson, Proc. Ent. Soc. Phil. Ill, 29, 9) 1864. 

 Osmia proxima Cresson, Proc. Eat. Soc. Phil. Ill, 32, (J", 1864. 

 Brit. Am., U. S. (Cress.). 



Osmia conjuncta Cress. 



Osmia conjtmcta Cresson, Proc. Ent. Soc. Phil. Ill, 31, 9, 1864. 

 Osmia 4-dentata Cresson, Trans, Am. Ent. Soc. VII, 107, ^J*, 1878. 

 Osmia cressonii Dalla Torre, Cat. Hym. X, 392, J^, 1896. 

 Carlinville, Illinois; two ^, forty-one § specimens; Ct., 

 N.Y. (Cress.). 



Osmia illinoensis ^. 



Entirely bright green, of the shade of Augochlora viridula, 

 including the tegulae and legs, except apical joints of tarsi ; 

 with a bluish or purplish reflection ; closely and rather finely 

 punctured, most coarsely on the head, most finely and sparsely 

 on abdomen, which is shining; pubescence long and thin, 

 white below, especially on clypeus where it is also dense, 

 above slightly tinged with ochraceous, on the abdomen short 

 and appearing subfuscous; wings hyaline, nervures fuscous, 

 second submarginal cell longer than first, narrowing nearly 

 one-half towards marginal, receiving first recurrent nervure 

 nearly one-third from base, the second near the tip ; sixth 

 segment slightly sulcate on the disc longitudinally, the apical 

 margin produced, slightly sinuate on the sides, entire medi- 

 ally, with only the slightest indication of a notch, apical 

 segment strongly bifid. Length 8 mm. 



Carlinville, Illinois; one $ specimen. 



Heriades Spin. 

 Heriades bucconis Say. 



Osmia bucconis Say, Boat. Journ. I, 400, 9cJ*, 1837, Lee. Edit. II. 777, 



1869. 

 Osmia bucconis Cresson, Proc. Ent. Soc. Phil. Ill, 9(j^, 1864. 

 Megachile osmoides Cresson, Trans. Am. Ent. Soc. IV, 269, 9^^, 1872. 

 Heriades ? denticulatum Cresson, Trans. Am. Ent. Soc. VII, 108, ^, 1878. 

 ? Osmia bucconis Provancher, Nat. Can. XIII, 208, 9(5^, 1882. 

 ? Osmia bucconis Provancher, Faun. Ent. Can. Hym., 708, 9 J^, 1883. 



