NORTH OF SIEXK 0. ; !1 3 



I'., nigrina, Lee Pro A.i ad. 1858, p. 186. 



With this species commences a series in which the humeral angles of th elytra are 

 much more distinct than in the two preceding. The thorax is also much less convex. 

 From the species following, this one may be readily known by the femora being merely 

 feeblj sinuate in both sexes. The elytra arc feebly striate, with muricate punctures nol 

 verj densely but verj irregularly placed. The males are rather more slender than the 

 females. The elytra of both are sub-opaque, a character otherwise unknown in the group. 

 More decidedly Upiform than any other species. 



Occurs in Oregon, thence eastward to Dacota, and southward into Colorado and 

 western Kansas. 



Length .60-.86 inch. 



E. hispilabris, Say, Blaps Journ. A. ■:,,!. :;. 260; Am. Ent. pi. 16. Lee, Proc. A.cad. 6, 61 



Lee . Pacif. R. R. Repts., App. 1. p. 19; I , Proc. A.cad. 1858, p. 183. 



I have no hesitation in applying the name of S ty to one of our species, better known 

 under the pre-occupied designation sulcata, Lee. The description and figure of Say ap- 

 to me perfectly applicable to this and not to one of the larger species of Group I. 

 The prominent dentiform anterior thoracic angles, so well described and figured, are not 

 found in any species of the obsenra series. I am unable to find character- warranting the 

 division of the species into three others, tin- forms so completelj passing from on,- to the 

 other without a break in the series. The specie- may he readily distinguished from all 

 those having the same form of thorax, by the more or less deeply sidcate elytra, with con- 

 vex interstices. The stria- are punctured and the interstices -month. In the variety 

 nupia, the elytra are rather more convex and broader, and the sulci less deep, and the 

 interstices consequently much less convex. 



Occurs abundantly in Oregon and Arizona. Kansas, Colorado and 'Texas. Say's spe- 

 cimens came from "Missouri," a very badly defined geographical region in his day. 



Length .70-1.0.") inch. 



E. sponsa, Lee., Proc. \> "1. 1858, i>. 184. 



In general form this species resembles tin- preceding. The thorax is, however, less 

 rounded on the sides and more nearly quadrate. The anterior angles are acute and fre- 

 quently prominent. The elytra are elongate oval, slightly flattened, feebly sub-striate 

 and with the interstices rather coarsely muricately punctured. Tin' apex i- moderately 

 acute in the male, never prolonged or caudate. The anterior femora of the male- are fur- 

 nished With an acute tOOth, the lemale- with one more ohtu-e. 



Occurs in southern Colorado and eastern New Mexico. 

 Length .80-.96 inch. 



AMKEI. PHIL080. SOC. — Vol.. XIV. — ','.) 



