18 AMERICAX COLEOPTERA. 



which remain unrecognized in this country. The orignal descrip- 

 tions will be found in the appendix, as the works in which they 

 were published are not readily accessible to a majority of our stu- 

 dents. The species known to me as occurring in our fauna are 

 quite numerous, but many are not capable of easy definition. The 

 following table is the best I have been able to devise after a long 

 study of a large amount of material : 



Antennae slender; frontal grooves short, not extending anteriorly on to the epis 

 toma ; middle tibiie bideutate on the inner side in the males 2 



Antennie thickened ; frontal grooves long, extending anteriorly on the epistoma 

 middle tibije feebly bisinuate on the inner side in the males 9 



2. Thorax narrower at base than apex 3 



Thorax as wide at base as apex 5 



Thorax wider at base than apex 8 



3. Thorax very distinctly narrower at base than apex; middle and hind tarsi 



with the three basal. joints deeply grooved ou the outer side. 



Black; sides of prosternuni coarsely punctured ; thorax with tlie sides sinu- 

 ate immediately in front of the hind angles; males with the teeth of 

 the middle tibise smaller and much nearer the apex than usual. 

 Length .57-.62 inch 1. pteroslicliina n. sp. 



Rufous or rufo-piceous; sides of prosternuni obsoletely punctured ; sides of 

 thorax sinuate some distance in front of the hind angles; middle tibia; 

 normally dentate in the males. Length .45-. 54 inch. 



2. tlioracica n. sp. 

 Thorax slightly narrower at base than apex. 



Posterior tarsi not grooved on the outer side 4. 



Posterior tarsi with the two basal joints grooved on the outer side; middle 

 and hind femora with two or three setigerous punctures along the 

 inner margin; thorax about one-half wider than long. Length .42- 

 50 inch 3. blancliardi n. sp. 



4. Middle and hind femora with four or five setigerous punctures along the 



inner margin ; legs rufous or rufo-piceous. 

 Slender; thorax nearly twice as wide as long, basal impressions bifoveate, 

 the fovese .subconfluent. Length .45-. 50 inch. . . .4. jac'obiiia Leo. 

 More robust; basal impressions of thorax with the inner fovea' obsolete, the 



outer distinct. Length .48-. 50 inch 5. isliipicla Lee. 



Middle and hind femora with two setigerous punctures along the inner margin; 

 thorax with the basal impressions bifoveate, the inner fovea punc- 

 tate, the outer usually impunctate or more sparsely punctured ; legs 

 dark piceous or black. Length .48-55 inch ... .6. l»ow<lilc*lii n. sp. 



5. Hind angles of thorax acutely carinate 6. 



Hind angles of thorax obtusely carinate 7. 



6. Hind tarsi not grooved on the outer side. 



Thorax with the sides strongly rounded nearly to base, suddenly and 

 strongly sinuate in front of the hind angles, which are acute, base 

 strongly einarginate; form more convex. Length ,45 ..')4 inch. 



7. aditlric-ta Putz. 



