NATURAL SCIENCES OF PHILADELPHIA. 305 



E. Posterior tarsi slender, "without marginal grooves, prosterniim not 

 margined at tip ; head very large, hind trochanters very long ; 

 prothorax quadrate, moderately narrowed behind, angles rect- 

 angular, base broadly foveate each side, not margined, outer 

 stria distinct, with a slight carina. 



Hind angles of prothorax more prominent, hind trochanters acute 

 at tip. 25. grandiceps Chaud. 



Hind angles of prothorax less prominent, hind trochanters rounded 

 at tip ; g7'andiceps Lee. 26. rostratus Newm. 



Division 2. One dorsal puncture on the third stria, behind the middle ; 

 scutellar stria vei^y short ; prosternvim not margined behind. 



A. Prothorax narrowed behind, hind angles subobtuse, basal strife two, 



the outer one shorter : 

 Outer basal stria distinct, with a feeble carina : last ventral segment % with 



a small tubercle near the tip. 27. mancus Lee. 



Outer basal stria punctiform, without carina : last ventral segment % with 



a broad apical impression. ' 28. diligendus Chaud. 



B. Prothorax narrowed behind and sinuate on the sides, basal angles 



rectangular prominent, impressions linear deep, punctulate ; elytra 

 more broadly oval ; fastiditus Dej., Stomis americana Lap. 



29. honestus Say. 



Division 3. Elytra with several dorsal punctures ; palpi Avith the last 

 joint cylindrical, truncate. 

 Episterna of metathorax short : 

 Prosternum not margined behind ; 

 Outer striae of elytra finer ; dorsal punctures 3 : 



Scutellar stria long. A. 



Scutellar stria short. B. 



Elytral striae equally deep : 

 Prothorax narrowed behind, basal foveae large : C. 



Prothorax wider behind, basal fovege double, narrow ; dorsal punc- 

 tures 3 ; Abacidus Lee. D. 

 Prosternum margined behind ; prothorax wider behind, basal foveae 

 double, dorsal punctures 3 ; Peristethus Lee. E. 

 Episterna of metathorax long : 

 Prosternum margined behind : 



Scutellar stria long, elytra sinuate at tip ; Poecilus. F. 



Prosternum not margined behind ; (scutellar stria long and elytral 

 strongly sinuate at tip) ; 

 Prothorax with basal fovete bistriate, and hind angles carinate ; 



dorsal punctures 3 ; Omaseus. G. 



Prothorax with linear basal fovese, hind angles not carinate : 



