NORTH OF MEXICO. 



321 



I contusuni, Lee, -Tourn. Acad., Ser. ?. 1. p. I": Smithson. Cent. "1 New Mex. 15, 



pi. 1. . 



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

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

 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 the middle of the base, the middle very 

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

 distinct, though obtuse, the margin is acute, slightly reflexed, and ahoays attaining tin 

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

 elytra, rather abrupt and with the tips slightly separated. The epipleurae 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. elongatum. This is the most elongate of out species, tin- elytra being fully twice longer than In- 1. The 



thorax is less margined than the preceding, and the disc moderately convex above, evidently na lind. The 



thorax is emarginate in front, less deeply than the preceding. The middle of tin- base is slightly prolonged, and the 

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



iwing to apex and attenuate, margin acute, ii"t foliaceous, extending to apex. Humeral angles distinct. Epi- 

 pleurae indistinctly defined excepl ;it apex. The legs are long and slender, the hind femur longer than tin- firs) four 

 abdominal segments. The head is sparselj muricately punctured, tin' thorax is sparsely punctured on the- 'lis,-, 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. 



1 i -tli .60, width .'.'n inch. 



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

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



,■ nly formed. Margin gradually rounded, slightly broader behind, hind angles obtuse, rounded and slightlj pro. 

 jecting beyond the middle <>f the base. Elytra elongate oval, sides rounded, gradually narrowing to apex ami 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 



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

 of one-and-a-hali. It ma\ he readily distinguished from contusum by the width of the 

 disc of the thorax. bj the males being never caudate or having suddenly acute elytra, by 

 the greater distinctness of the epipleural limits and by the margin of the elytra never at- 

 taining tiie apex. 



( >CCUK in Kansas and ( lolorado. 



Length .26-.70 inch. 



AMERI. PHILOBO. SOC— VOL. XIV.— 81 



