io8 MEMOIRS ON THE COLEOPTERA. 



pointed and notably longer than the two preceding; prothorax rather trans- 

 verse, truncate anteriorly, rounded basally, parallel, the sides nearly straight, 

 rounding apically, the basal angles obtuse but not blunt, much wider than 

 the head and about as wide as the elytral base, unimpressed; elytra rather 

 short, strongly transverse, not sinuate at apex, the suture only very slightly 

 longer than the prothorax; abdomen narrower than the elytra, gradually 

 and very evidently narrowed apically, the sixth tergite (cf) with four short 

 apical teeth, the two medial continued obliquely forward in strong carinae, 

 which include a flat depressed asperulate surface that is truncate at apex 

 nearly at the apices of the teeth, the surface obliquely sloping laterally from 

 the carinae and separated at apex from the larger lateral teeth at each side 

 by a deep sinuosity, which is about as wide as the median interval. Length 

 1.8 mm.; width 0.45 mm. Mississippi (Vicksburg). 



The coloration and remarkable sternal and sexual characters will 

 distinguish this species at once. It is unfortunately represented 

 at present by a single specimen. 



Canastota n. subgen. 



The coloration throughout this group of species is also pallid. 

 The coxae are moderately separated, the mesosternal process passing 

 behind their middle, prolonged, becoming parallel, with its rather 

 wide and truncate apex separated from the rounded apex of the 

 pronounced metasternal projection, by an extremely short interval. 

 The hind tarsi are long, the first three joints decreasing slowly in 

 length and the claws are very slender, only feebly arcuate. The 

 type is the following: 



Sableta (Canastota) canadensis n. sp. Rather stout, pale testaceous, the 

 head and fourth tergite black or nearly so, the elytra more flavate, very in- 

 definitely infumate postero-externally; surface slightly shining, the fine 

 punctures rather close-set and asperulate throughout and conspicuously 

 close and strong on the abdomen; head rather transverse, truncate at base, 

 the eyes strongly convex, at about three-fourths of their length from the base, 

 the tempora much less prominent and rapidly arcuato-converging, the carinse 

 entire and unusually elevated; antennae very pale, rather short, rapidly and 

 strongly incrassate, the second joint a little longer but thinner than the first 

 and evidently longer than the third, the outer joints very strongly transverse, 

 the last not longer than the two preceding; prothorax convex, much wider 

 than the head and not quite as wide as the elytra, rather transverse, the 

 parallel sides feebly arcuate but rounding anteriorly before the middle; 

 elytra moderately transverse, the apices deeply sinuate externally, the suture 

 nearly a third longer than the prothorax; abdomen narrower than the elytra, 

 the straight sides gradually and feebly converging from base to apex, the 

 fifth tergite (cf) with a minute but strong median tubercle near the apex, 

 the sixth with a rather large flat triangular tooth at each side of the apex, 



