CHALCOLEPIDIUS. 275 



d'". Prothorax and elytra without a marginal band of lighter scales ; 

 the elytral interstices equal. 

 g\ Prothorax dilated at the sides ; elytral striae distinctly punctured 



at the sides only inops. 



A 4 . Prothorax not dilated at the sides ; elytral striae distinctly punc- 

 tured throughout murinus. 



U. Propleurae not grooved in front ; antennae with the third joint as long 

 as the fourth; scales uniformly glaucous-green; sutural angles of 



the elytral sharply mucronate jansoni. 



b. Antennae pectinate, and the tibiae and tarsi simple, in the $ ; propleurae 



not grooved in front • antennae with the third joint very short . . . boucardi. 



2. Scutellum declivous from about the middle forwards, obcordate ; propleurae 



not grooved in front; antennae with the third joint shorter than the 

 fourth ; anterior and intermediate tibiae abruptly widened on the inner 

 side at the apex in the <? desmaresti. 



3. Scutellum tumid in the middle, declivous anteriorly, scarcely transverse . . mniszechi. 



4. Scutellum strongly transverse; antennae with the third joint very much 



shorter than the fourth ; propleurae not or shallowly grooved in front ; 

 anterior tibiae denticulate or simple in the $ *. 

 c'. Form oval or oblong oval. 



c". Prothorax and elytra with a marginal band of whitish scales (obsolete 



in the $ ) mexicanus. 



d". Prothorax and elytra without a marginal band of lighter scales. 



e"'. Sides of the prothorax strongly sinuate behind, the hind angles 

 abruptly divergent; elytral interstices equal. 



i 4 . Surface of the prothorax uneven lenzi. 



f. Surface of the prothorax even behrensi. 



/"'. Sides of the prothorax moderately or feebly sinuate behind, the hind 

 angles not abruptly divergent. 

 ¥. Elytral interstices subequal ; sutural angles blunt or rectangular. 

 f. Elytra narrowing from about the middle. 



i e . Size very large ; scales uniformly blue or green jekeli. 



f. Size moderate ; scales olivaceous-green, sometimes white along 



each of the striae rodriguezi. 



k B . Elytra narrowing from the base. 



k 6 . Interstices convex ; punctures of the striae fine attenuatus. 



l e . Interstices almost flat ; punctures of the striae rather coarse . cuneatus. 

 /*. Alternate elytral interstices broader and more convex; sutural 



angles sharp owydatus. 



d'. Form elongate, narrow, subparallel ; hind angles of the prothorax abruptly 

 divergent, 

 e". Elytra lightly punctate-striate, the interstices almost flat ; scales of the 

 upper surface rather coarse, those of the under surface white and 

 elongate ; propleurae not grooved in front dugesi. 



* In the species of which the males are known. 



2N2 



