NATURAL SCIENCES OF PHILADEEPHIA. 
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I. Elytra glabrous, hardly or not at all margined. E. obscura, 
deletaj^arata, dispersa, sulcipennis, acuta. 
II. Elytra glabrous, strongly margined. E. suturalis,tfexana. 
III. {B.) Humeral angles slightly prolonged under the thorax ; thorax and 
elytra usually pubescent, the latter more or less muricate. Body 
broad. Pediniform. 
E. pedinoides, asperata, robusta, tricostata. 
B. Elytra convex or subdepressed, oval, not margined, more or less sulcate, 
or at least punctured in rows, with alternate rows composed of very distant 
punctures. Prosternum never mucronate, humeral angles distinct and mar- 
gined : anterior tarsi simple ; spurs of anterior tibiae alike in both sexes. 
IV. Thorax narrowed behind, anterior femora toothed. Anterior angles of 
thorax subacuminate. 
E. sulcata, nupta, gracilis, sponsa, convexa. 
V. Thorax slightly narrowed behind, anterior angles not acuminate, femora 
mutic. 
a. Elytra caudate. E. caudifera. 
/?. Elytra hardly acuminate. E. obsoleta. 
C. Elytra convex, not margined on the sides, more or less punctured in rows : 
(punctures not muricate, except in X.) 
VI. Elytra without humeral angles. E. grandicolis. 
Humeral angles distinct : thorax narrowed behind : anterior angles 
not acuminate. VII. — XIV. 
Prosternum horizontally mucronate at tip. VII. — X. 
VIT. Humeral angles produced. E. fusiformis. 
VIII. Base of elytra truncate. 
a. Elytra punctured in rows. E. subnitens, seriata, debilis. 
/?. Elytra confusedly punctured. E. cognata, extricata. 
IX. Base of elytra slightly emarginate, prosternum horizontally mucronate 
at tip. E. carbonaria, soror, immunis, striolata. 
X. Base of elytra truncate, punctures muricate, prosternum abruptly trun- 
cate at tip. nigrina. 
Prosternum obliquely mucronate at tip, base of elytra truncate. 
XL— xn. 
XI. Body ovate, anterior femora strongly toothed. E. ventricosa. 
XII. Body elongate, femora not toothed. E, gigantea, longicollis. 
XIII. Base of elytra truncate, prosternum not mucronate, femora not toothed. 
(Body subcylindrical in the males, ovate in the females, elytra con- 
fusedly punctured). E. quadricollis, vicina. 
XIV. Humeral angles distinct, strongly margined, base of elytra truncate ; 
thorax much rounded on the sides, elytra ovate, not convex, confusedly 
finely punctured, femora and prosternum mutic. (Mexican species.) 
XV. Humeral angles distinct, thorax with the anterior angles more or less 
acuminate : prosternum horizontally mucronate. 
a. Femora all acutely toothed. E. a r m a t a . 
/?. Femora all obtusely toothed. E. femorata. 
XVI. Humeral angles distinct ; thorax with the angles strongly acuminate ; 
anterior femora strongly toothed. 
E. dentipes, laticollis, acuticauda. 
D. Elytra usually convex, sometimes flattened, not margined, irregularly very 
densely punctured, at the sides and tip muricate and setose. Femora 
mutic. (The anterior in XIX. very slightly toothed.) 
1858.] 
