346 Trans. Acad. Sci. of St. Louis. 



Inverness, Florida; Carlinville, Illinois; 43 §, 26 $ speci- 

 mens; U. S. (Cress.). 



I have taken the sexes in copula. 



COELIOXTS SAYI. 



Coelioxys 8-dentata Say, Long's 2nd Expedit. II, 353, <$ Var. a, 1824, Lee. 

 Edit. I, 239. 



Coelioxys 8-dentata Say. Bost. Journ. I, 400, $, 1837, Lee. Edit. II, 777. 



Coelioxys 8-dentata Cresson, Proc. Ent. Soc. Phil. II, 401, J 1 ?, 1864. 



Carlinville, Illinois: Inverness, Florida; 11 §, 27 ^ speci- 

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



The female is most readily distinguished by its clypeus 

 being subbilobate. The male may be distinguished from that 

 of the preceding by the interrupted fascia on mesonotum 

 being less evident, darker legs, abdomen more shining, more 

 sparsely punctured, segments less indented transversely, 

 fasciae less evident and whiter. 



Coelioxys modesta Sm. 



Coelioxys modesta Smith, Brit. Mus. Cat. Hym. II, 271, $, 1854. 



Coelioxys modesta Cresson, Proc. Ent. Soc. Phil. II, 404, 9> 1864. 



g. — Easily matched with female by the first segment of 

 abdomen being carinate at the edge of the wide concavity and 

 being fasciate on basal and apical margins, last segment nar- 

 row, the fossa quite longitudinal, the teeth being unusually 

 approximated, the interval with black or fuscous hairs; man- 

 dibles black, or rufous in middle, legs ferruginous, varying 

 to more or less black, especiall}' apical joints of hind tarsi. 

 Length 9-11 mm., $ 10-12 mm. 



Carlinville, Illinois, 85, 12 $ specimens; Pa.,N. Y., Mex., 

 (Cress.). 



Coelioxys totonaca Cress. 



Coelioxys totonaca Cresson, Trans. Am. Ent. Soc. VII, 102, ^9, 1878. 



Coelioxys germana Cresson, Trans. Am. Ent. Soc. VII, 102, $, 1878. 



Carlinville, Illinois; 4 5, 4^, specimens ; 111., Mex. (Cress.). 



The form of the trochanters, and the color of pubescence, 

 is variable. All of my specimens have the base of the abdo- 

 men red on the sides. <£, 9-11 mm ; 5, 10-12 mm. 



