104 MR. HALDEMAN'S DESCRIPTIONS OF COLEOPTERA. 



The specimen named A. pensvallensis Mels. Pr. Acad. ii. 135, is doubtless European, 

 as it is stuck with a European pin, although caught at a time when these were 

 rarely to be had in this country. 



A. DENTicuLATUs Httld. Shining black, beneath fuscous ; clavus of the antennae 

 fulvous; clypeus with two denticulations on each side of the anterior emargination. 3 1. 

 long, 1 \ wide. Eastern side of the Rocky Mountains. Head coarsely punctured, auricu- 

 late, a transverse raised line posteriorly; clypeus distinctly emarginate in front, followed 

 by a secondary emargination, separated and followed by a projecting tooth ; lateral 

 margin recurved, and exhibiting a tendency to form two additional denticulations : 

 pronotiim with numerous fine punctures and dilated impressed ones, which are more 

 dense laterally ; anterior angles scarcely advanced, posterior ones obtusely rounded ; 

 lateral and posterior margins slightly recurved ; anterior margin with a narrow line of 

 fulvous hair : scutel densely punctured at base : elytral striae (10) crenate-punctate, 

 intervals flat : epipleura and beneath distinctly punctate, and clothed with fulvous 

 hairs. 



A. LUTiJLENTUs Eald. Proceed. Acad. i. 304. Mels. id. ii. 135. A. corvinus]^. 

 Black, somewhat glossy, minutely punctate, elytra with the striae fine and indistinct ; 

 male with an indistinct frontal tubercle. 21 — 3 1. long. Pennsylvania, Carolina ; 

 October. Head transverse, regularly hemi-hexagonal, auriculate, widely sub-emargi- 

 nate; anterior angles acute and projecting in the form of teeth ; margin reflexed, sides 

 converging rectili nearly ; disk M'ith dilated sub-confluent punctures ; front with an 

 obsolete tubercle : pronotum subquadrate, densely punctured like the head ; anterior 

 margin with fulvous hair ; anterior angles sub-reflexed laterally ; scutel sparsely 

 punctured : elytra finely chagrined or minutely scabrous, with narrow sub-crenulate 

 indistinct striae. Allied to A. sericatus of Europe. 



A. coRviNus Hald. Dull black, sub-opake, head and prothorax profoundly and 

 densely punctured ; elytra punctate striate ; interstices plane, convex towards the 

 apex. Long. 3 lin. Head convex and simple above, hemi-hexagonal, sub-emarginate, 

 auriculate, sides rectilinear, margins slightly reflexed ; palpi ferruginous : prothorax 

 advanced towards the scutel, uniformly and densely covered with deep dilated 

 punctures : elytra somewhat glossy, black, margins with a rufous tinge ; striae distinct, 

 narrow, with oblong indistinct punctures above, and round distinct ones laterally, 

 these crenulating the interstices posteriorly ; pectus with distinct dilated punctures : 

 apex of the abdomen rufous : feet glossy rufous, femora finely punctured. 



A. ATERRIMDS Mels. Proceed. Acad. ii. 136. A. A-tuberculatus F. i. 75. Dej. 

 Lake Superior, Southern and Middle States. ^. rugulosiis\.De]. is probably the 

 female. 



