Robertson — North American Bees. 345 



Epeolus pectoralis 5. 



This species agrees in most respects with the preceding ; 

 the front legs and teguhie more ferruginous, though sometimes 

 quite dark; base of abdomen more pubescent; pleura with 

 the pubescent patch quite thin and irregular, below smooth, 

 shining, coarsely and sparsely punctured ; mesothorax above 

 densely and finely punctured. Length 9-10 mm. 



Carlinville, Illinois ; seven 5 specimens. 



This is a very ordinary looking species, but the pleura is 

 punctured as in U. lectus and E. bifascialus. 



CoELioxYS Latr. 



COELIOXYS RUFITARSIS Sm. 



Coelioxys rufiitarsus Smith, Brit. Mus. Cat, Hym. II, 271, (^, 1854. 

 Coelioxys dubitata Smith, Brit. Mus. Cat. Hym. II, 272, $, 1854. 

 Coelioxys rufltarsus Cres8on,Proc. Ent. Soc. Phil. II. 400, (^, 1864. 

 Coelioxys dubitata Cresson Proc Ent. Soc. Phil. II, 40O, 9, 1864. 

 Coelioxys nifitarsus Provancher, Faun. Ent. Can. Hym., 725, J^ 9» 1883. 

 Coelioxys dubitata Dalla Torre, Cat. Hym. X, 485, 1896. 

 Coelioxys rufitarsis Dalla Torre, Cat. Hym. X, 493, 1896. 



Can., U. S. (Cress.). 



My efforts in matching the sexes of the local species con- 

 vince me that Smith and Cresson were correct in supposing 

 that C duhiiata is the female of C. rufitarsis, 



Coelioxys 8-dentata Say. 



Coelioxys 8-dentata Say, Long's 2nd Expedit. II, 353, J^, (ex, var. a),. 

 1824, Lee. Edit. I, 289. 



Coelioxys brevis Cresson, Proc. Ent. Soc. Phil. II, 402, ^9> 1^64 (nee 

 Eversm.). 



Coelioxys altilis Cresson, Trans. Am. Soc. VII, 219, 1879. 



Coelioxys cressonii Dalla Torre, Cat. Hym. X, 485, 1896. 



The characters indicated by Say for his typical form (i. e., 

 excluding var. a) — thorax with a dentated band before, 

 interrupted in the middle, feet rufous, segments of abdomen 

 each with a transverse indented line, the fasciae more distinct, 

 tinged with yellow, and the abdomen opaque in the male — are 

 exactly the characters in which the male of this species is to 

 be distinguished from the following. The abdomen of male 

 appears more opaque from being more strongly punctured. 

 But Say was comparing with a female to which it did not 

 belong. 



