Horn.] dl-J [June 20, 



Aiiteniial cavities at the sides of the prostenium. An- 



tennie inserted under the frontal margin Sapkinus. 



Antennal cavities on the under side of protliorax in front 

 of the coxae. Antennae frontah 

 •Eyes finely granulated, not pi'ominent. 

 Thorax M^ithout deep lateral groove. 



Tibiae toothed. Pygidium regularly convex Teretritjs. 



Tibiffi spinulose, Pygidium double Teketriosoma. 



Thorax with deep lateral groove. Prostei'num deeply 



bisulcate, body oblong. Tibiae not toothed Plegaderus. 



Eyes coarsely granulated and very convex. 



Hind tarsi five-jointed. Scutellum invisible Bacanius. 



Hind tarsi four-jointed. 



Scutellum distinct Acritus. 



Scutellum invisible Aeletes. 



Bacanius has been removed from the preceding sub-tribe and placed 

 near Acritus with which it appears to have many points of resemblance. 

 The eyes of the last three genera are rounder and more convex than is 

 usual in the entire family and very coarsely granulated. The scape of 

 the anteunpe is lodged in a deej) groove immediately in front of the eyes, 

 which are not bordered by a narrow corneous band in front. The deep 

 groove adds still further to the ajjparent convexity of the eyes. 

 Saprinus, Leach. 

 The arrangement of the species of this genus in groups, adopted by 

 Dr. Leconte (Proc. Acad. VI., p. 40), appears to afford the most natural 

 method of their subdivision and is, at the same time founded on charac- 

 ters which ai'C much the least variable of any that can be nrade use of. 

 With some slight modification to avoid the use of the epipleural stri;e, 

 the following system is identical, and the groups here retained are 

 equivalent to those already established. 

 Front not margined. 



Hind tibiie more slender than the middle tibial and at apex 

 narrower than at middle, outer edge and apex not spinu- 



lose Group, I. 



Hind tibiai as broad or broader than the middle, at apex 

 always broader, outer edge spinulose. 

 Prosternum fiat, strife horizontal and united in front. . . . Group, ii. 

 Prosternum at least moderately convex. 



Prosternum without stria3 Group, iii. 



Prostei'num distinctly striate. 



Striie parallel, horizontal, abbreviated in front Group, iv. 



Striae divergent and ascending. 

 Prosternum moderately convex. 



Prosternum anteriorly not foveate Group, V. 



Prosternum foveate Group, vi. 



Pi-osternum compresso-carinate Group, vir. 



