8 GEO. H. HORN, M. D. 



The following table gives the subdivisions called groups, which I 

 had hoped to name from some characteristic species in place of letter, 

 but this proved to be inadmissible : 



Apex of hind tibije fimbriate with short equal spinules. 

 Head more or less tiiberciilate. 



Thorax with distinct basal marginal line. 



Clypeus quadriangulate or cfuadridenticulate Group A. 



Clypeus emarginate, sometimes feebly biangulate. 



Mesosternum not carinate between the coxiB Group B, 



Mesosternum distinctly carinate Group C 



Thorax without trace of basal marginal line Group D. 



Head not at all tuberculate. 



Mesosternum not carinate ; thorax not narrowed at base. 

 Head coarsely roughly punctured ; clypeus dentate each side of emargina- 



tion and more externally angulate Group E. 



Head evenly convex and punctate ; clypeus feebly emarginate. ...Group F. 

 Mesosternum carinate between the coxae ; thorax narrower at base. 



Group G. 

 Apex of hind tibise fimbriate with unequal spinules. 



Elytra opaque, usually black, often strigose or granulate Group H. 



Elytra more or less shining. 



Thorax not narrower at base than apex. 

 Elytra not pubescent. 

 Head tuberculate or not, never very roughly punctured, and without 



transverse clypeal ridge Group I. 



Head very roughly punctate, without frontal tubercles, clypeus with a 



transverse ridge Group K. 



Elytra more or less pubescent Group Tj. 



Thorax narrower at base than apex ; humeri of elytra dentiform. 



Group M. 



Group A. 



Scutellum small. Posterior tibire fimbriate with equal spinules at 

 tip. Anterior tibise tridentate, serrulate or crenulate above, the an- 

 terior face smooth. First joint of anterior tarsi shorter than the 

 second. First joint of hind tarsi variable. Head more or less tu- 

 berculate, the clypeus quadridentate in front. Mesosternum not 

 carinate. Thorax with entire basal marginal line. 



Two species enter this group and are thus distinguished : 



Entire margin fimbriate, the posterior tibise fimbriate internally with long hairs. 

 Anterior tibise coarsely serrate in the upper half. First joint of hind tarsus 

 not longer than the next two. Color uniformly piceous (lenticulatiis. 



Margin not fimbriate, posterior tibiae not fimbriate. Anterior tibite feebly ser- 

 rulate above. First joint of hind tarsus as long as the next three. Color 

 black, elytra often maculate with pale round spots on intervals 3-5-7. 



coiispersus. 



