March, '02] entomological news. 79 



Some New or Little Known Bees. 

 By Charles Robertson, Carlinville, Illinois. 



Osmia cobaltina Cr. 



Ostnia cobaltina Cresson, Trans. Am. Ent. Sor. vii. 104, $, 1878. 

 Osmta Illinoensis Robertson, Trans. Acad. Sci. St. Louis vii, 347, 

 c?, 1897. 



Osmia atriventris Cr. 



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

 Osmia proxima, Cresson, ibid. 32, ^J. 



Osmia major sp nov. 



9. — Closely resembles the female of the preceding, but is much larger : 

 the mandibles at apex relatively broader, the middle tooth much nearer 

 the outer than inner tooth, while in O. atriventris the middle toolh is 

 about half way between the two ; segment 6 of abdomen more pubescent, 

 more finely punctured. Length 11 mm. 



(^. — Also closely resembles the male of O. atriventris, but is larger, 

 the second ventral segment more finely punctured, its apical margin 

 rather densely pubescent. Length 10 mm. 



Carlinville, Illinois ; 2 9 , i ^ specimen. 



Osmia cordata sp. nov. 



c^. — Resembles the male of O. major in size, general form, color and 

 pubescence ; antennae long, black, joint 3 hardly longer than 2, much 

 shorter than 4 ; wings hyaline, basal nervure interstitial with median ; 

 notch on segment 6 of abdomen very wide and shallow ; 7 strongly bi- 

 dentate, as usual ; ventral segment i coarsely punctured, emarginate so 

 that it appears cordate. Length lo-ii mm. 



Carlinville, Illinois ; 2 S specimens. This may be the male 

 of O. brevis. 



Osmia pamila Cr. 



Osviia pumila Cresson, Proc. Ent. Soc. Phil, iii, 35, 9, 1864. 

 Osmia vicina Cresson, ibid. 38, cJ*. 



Illinois specimens of the 9 were identified by Mr. Cresson 

 as O. albiventris, and I have suspected that the sexes described 

 under that name did not belong together. Through the kind- 

 ness of Mr, Cresson I have had an opportunity to examine the 

 type. It is hard to distinguish the females of the two species. 

 The female of O. pumila is usually smaller, the last joint of 

 antennae about as long as 4-6 together, enclosure of metathorax 

 more metallic, less triangular, above with a transverse rugose 



