NORTH OF MEXICO. 



321 



E. contmnm, Leo., .Touxn, Acad., Ser. 2, 4, p. 40; Smitlison. Cent. 18",!); Col., Kans. and New Mcx. 15, 

 pi. 1, flg, 8. 



This species may be known by the broader thorax (proper), with narrower, less re- 

 Hexed margins. The margin is, however, thin, as in the preceding, and formed by the 



sudden attenuation of the sides of the thorax. The sides of the margin are rounded from 

 apex and not broader at base. The basal angles are broadly rounded. The base of 

 thorax lias the hind angles more prominent than tin; middle of tin; base, the middle very 

 squarely truncate. The elytra, are elongate oval, and I he humeral angles (without margin) 

 distinct, though obtuse, the margin is acute, slightly rofiexed, and always attaining the 

 apex of the elytra. The males are always provided with an apical prolongation of the 

 elytra, rather abrupt and with tin; tips slightly separated. The epipleurse are always 

 poorly defined except near the apex. The sculpture above is similar to the preceding 

 species; specimens from Arizona are more opaque. 



Occurs from Kansas to Arizona. 



Length .50-. 78 inch. 



E. elongatu m . This is the most elongate of our species, the elytra being fully twice longer than broad. The 

 thorax Is less margined than the precediug, and the diso moderately convex above, evidently narrower behind. The 

 thorax is emarginate in front, less deeply than the preceding. The middle of the ha.se is slightly prolonged, and the 

 angles formed by the margin very obtusely rounded. The elytra are elongate, feebly rounded on the sides, gradually 

 narrowing to apex and attenuate, margin acute, not foliaceous, extending to apex. Humeral angles distinct. Kpi- 

 pleurse indistinctly denned except at apex. The logs are long and slender, the hind femur longer than the first four 

 abdominal segments. The head is sparsely muricately punctured, the thorax is sparsely punctured on the disc, granu- 

 lar on the margins, the elytra are sculptured as in the preceding species. 



Occurs in western Nevada,. For the only specimen in my cabinet I am indebted to Mr. Win. M. Gabb, of the 

 Geological Survey of California. 



Length .00, width .20 inch. 



E. planum. Thorax one-half broader than long, feebly convex above and slightly narrower behind, anteriorly 

 not deeply emarginate, posteriorly with the middle of base truncate, not prolonged, margin acute, not foliaceous nor 

 suddenly formed. Margin gradually rounded, slightly broader behind, hind angles obtuse, rounded and slightly pro- 

 jecting beyond flic middle of the base. Elytra elongate oval, sides rounded, gradually narrowing to apex and acute 

 behind, not caudate. Margin acute, feebly reflexed, not attaining the apex. Disc flattened, never concave, angles 

 distinct, rounded, middle of base prolonged. Epipleural limits distinctly defined. The sculpture is similar in all re- 

 spects to eontuBwm, 



In this species the thorax is broader than one elytron and nearly equals tin 1 breadth 

 of one-and-a-half. It may be readily distinguished from contusum by the width of the 

 disc of the thorax, by tin; males being never caudate or having suddenly acute elytra, by 

 the greater distinctness of the epipleural limits and by tin; margin of th.; elytra never at- 

 taining the apex. 



Occurs in Kansas and Colorado. 



Length .2(>-.7() inch. 



AMERI. PH1LOSO. SOC. — VOL. XIV. — 81 



