562 Coleopterological Notices, V. 



Grroup IV. 

 External subhumeral stria contiguous to the marginal ; elytral punctures 

 abruptly coarse posteriorly, not distinct near the base (type pectoralis). 

 Larger, black, without aeneous lustre ; mesosternum coarsely, densely punc- 

 tate obsidianus 



Smaller, more narrowly oval ; lustre evidently aeneous ; mesosternum finely 



and sparsely punctate SllliaeratllS 



External subhumeral distinct and diverging from the marginal ; elytral punc- 

 tures not abruptly coarse posteriorly and visible over the entire disk 

 (type obscurus). 

 Dorsal striae long, almost extending to apical fourth ; body oblong-oval, 



larger laramiensis 



Dorsal striae shorter, extending but slightly behind the middle ; body 

 shorter, oval ailflax 



Group V. 

 Form, coloration and sculpture very nearly similar to pennftylvanicus ; pygidium 

 tumid and carinate toward apex, broadly impressed toward the sides except 

 near the base profusus 



Group VI. 



Elytra without distinct punctuation except in about apical half socius 



Elytra punctate throughout, but generally feebly and finely so toward base, 



the punctures sometimes rather abruptly coarser and denser behind. 



Pronotum evidently more coarsely and densely punctate near the sides. 



lentus 

 Pronotum not more strongly and generally scarcely more densely punctate 

 toward the sides, distinctly and evenly punctate throughout the disk. 

 Sutural stria entire ; lustre dull ; punctures strong and dense throughout. 



opacellus 

 Sutural stria abbreviated at basal fourth ; punctures strong and dense 



throughout, more or less confluent posteriorly cribruill 



Sutur.al stria abbreviated or obsolescent in basal third ; punctures sparse 

 throughout ; lustre polished. 

 Larger, broadly oval ; sutural stria wholly obsolete toward apex. 



cletractiis 

 Small, narrowly oval ; sutural stria attaining the apex... contractus 



Group VII. 

 Prothorax fimbriate at the sides ; body black, opaque, punctured throughout. 



iiitritiis 



Group VIII. 

 Elytra with a distinct sutural stria which is abbreviated or interrupted behind. 



Elytra without trace of punctuation at any part illipillictellUS 



Elytra punctured nearly as \x\fraternus; pronotal sculpture narrowly effaced 

 along the lateral margins laxatlis 



