NORTH OF MEXICO. 



311 



species is unnecessary, while from the following it may be distinguished by having very 

 much more prominent femoral spurs and by the form of the elytra already mentioned. 



Occurs abundantly on the Colorado Desert (Leconte); those in my cabinet are from 

 central Arizona, where it exceeds all other insects in abundance except K Mspilabria, 

 Say, (sulcata, Lee.) Length .58-1.30 inch. The greater number are over one inch in length. 



E. fern or at a, Leo., Ann. Lye. 5, 134. 

 The teeth of the femora are all very obtuse. 

 Occurs at San Diego, California. 

 Length .68-1.00 inch. 



The species of the section hereafter noted differ from the three preceding, in having 

 only the anterior femur (if any) toothed. 



In accordance with the form of thorax the species may be again sub-divided, those 

 with a sub-quadrate thorax with very feebly rounded sides, and with the base rarely nar- 

 rower will be mentioned first. 



E, longioollis, Loo., Ann. Lye. 5, 134. Haydenii, Lee, Proo. Acad. L858, i>. L86. 



Frequently elongated fusiform in shape, thorax generally longer than broad, sides 

 feebly rounded, base always broader than apex. Femora mutic in both sexes. The elytra 

 are smooth or feebly punctured, never striate. 



Occurs abundantly in New Mexico and Arizona, and occasionally in Kansas and 

 Colorado. 



Length .90-1.25 inch. 



E gen tills, Lee., Proo. Aoad. 1858, p. 187. 



The femora, are mutic as in longicollia, from which it differs in its smaller size, more 

 quadrate thorax with more rounded sides and rather more prominent anterior angles. 

 Occurs at San Diego, Cal. 

 Length .75 inch. 



E. ventrieosa, Lee., Proo. Acad. 1858, p. 1(18. 



With this species commences a series with the anterior femora of the i (and fre- 

 quently ?) armed with, an acute tooth or sinuate. The elytra, are also feebly sulcate and 

 rows of rather coarse punctures. In this the elytra are strongly ventricose in both sexes, 

 and also caudate in the male. The anterior femora, of the nude are armed with a robust 

 tooth, strongly curved. The thorax is broader than long, with sides and base moderately 

 rounded, anteriorly feebly emarginate, angles distinct, not dentiform. 



Occurs in Texas, near the Ilio Grande. 



Length 1.05-1.40 inch. 



