NORTH AMERICAN COLEOPTERA. 51 



on the lower edge for the tihiaj, the trochanters of the anterior legs small, of the 

 middle longer, of the posterior nearly as long as the femur ; tibise slender, the 

 spurs distinct ; tarsi not elongate, rather flat, the first joint of the posterior pair 

 as long as the next three, the fourth excavate-emarginate, claws ]K;ctinate in 

 their basal half; body alate. 



The two species in our fauna may be distinguished in the following 

 manner : 



Antennte pectinate 2 



Autennffi serrate 3 



2. — The pectination beginning on the third joint ]>uI»$atOi* % 



The pectination beginning on the fourth joint coiivoxicolle % 



3. — Third joint of antennse a little longer than the fourth i>ul!>»ator 9 



Third joint as long as the next two coiivexicolle f 



In addition it will be observed that the claws are thicker at base 

 in j)idmt(rr, and the pectinations numerous, while in convexlcolle the 

 claws are slender and pectinations not more than two or three. 



C pulsator Hald. — Oblong, moderately convex, black, feebly shining, 

 sparsely clothed with short cinereous pubescence; antennse piceous, a little 

 shorter than half the body ; head densely punctate, rugose ; clypeus narrower at 

 ))ase, obtusely elevated along its middle ; thorax very much broader than long, 

 sides strongly arcuate in front, slightly convergent posteriorly, the hind angles 

 slightly everted, disc convex, coarsely and densely punctured ; elytra wider at 

 base than the thorax, the humeri distinct but obtuse, sides parallel, arcuately 

 narrowing at apical third, disc moderately convex, deeply striate, the striae 

 coarsely and closely punctate, intervals flat, densely punctate and slightly rugose ; 

 body beneath densely and rather finely punctate, finely pubescent, metasternum 

 more coarsely punctate ; legs piceous, tarsi ferruginous. Length .28 -.34 inch; 

 7-8.5 mm. 



Male. — First joint of antennse stout, second small, triangular, joints three to 

 ten subequal, each with a clavate branch arising from the ba.se in front, that from 

 the third a little shorter than the others, eleventh joint clavate, a little longer 

 than the jireceding two. 



Female. — First joint stout, .second small, third longer than the fourth, joints 

 four to ten dentate within, the eleventh joint a little longer than the tenth. 



Occurs from Pennsylvania to Illinois and North Carolina ; very 

 rare. 



C OOiivexicolle Lee. — Oblong, moderately elongate, black, subopaque, very 

 sparsely cinereous pubescent ; antennse shorter than half the body, piceous ; head 

 coarsely, densely punctate ; clypeus narrow at base, obtusely carinate along the 

 middle ; thorax much broader than long, sides in front arcuate, posteriorly 

 slightly convergent, the hind angles slightly i^romiuent, disc convex, coarsely, 

 densely and subrugosely punctured ; elytra wider at base than the thorax, the 

 humeri distinct but rounded, sides parallel, arcuately narrowing at apical third, 

 disc moderately convex, strise not dee]), coarsely and closely punctate, the inter- 

 vals flat, finely but not densely punctured, slightly wrinkled transversely ; body 

 beneath more shining, the punctuation rather fine but not dense, coarser on the 

 prosternum ; legs brownish. Length .26 -.28 inch; 6.5-7 mm. 



