170 



D. Trilobed outline divided, strong- 

 ly developed. 

 E. Hind angles of prothorax quite 



sharply rectangular 



EE. Hind angles of prothorax 

 (from all points of view) ob- 

 tuse or rounded off 



DD. Trilobed outline very feeble, 

 not divided. 

 E. Pronotum sparsely punctured 

 (not more than 14 punctures 

 in the length). 

 F. Sides of prothorax well 

 rounded (not less so than 

 in H. jubatus) 

 G. Labrum (viewed from in 

 front) with a well-defined 

 erect front face (resemb- 

 ling that of H. elongatus) 

 GG. Labrum not having a 

 distinct erect front face 

 FF. Sides of prothorax scarcely 

 rounded (greatest width 

 across base). ') 



G. External teeth of front 

 tibiae very feeble and 



blunt 



GG. External teeth of front 



tibia? strong and acute ... 



EE. Pronotum much more closely 



punctured (about 20 fine 



punctures in length) 



CC. Lateral margin of pronotum not 

 expanded in front. 

 D. Middle lobe of trilobed outline 

 rounded. 

 E. Punctures of pronotum nu- 

 merous (at least 20 in the 

 length). 

 F. Elvtral punctures moderate 

 (15 from suture passing 

 middle). 

 G. Prothorax but little nar- 

 rowed in front. 

 H. Sides of prothorax 



lightly arched 

 HH. Sides of prothorax 

 strongly rounded 

 GG. Prothorax very strongly 



narrowed in front 



FF. Elytral punctures extreme- 

 ly fine and close (15 from 

 suture not reaching middle) 

 EE. Punctures of pronotum not- 

 ably less numerous. 

 F. Tilobed outline strongly de- 

 veloped, strongly divided, 

 middle lobe less than half a 

 lateral lobe 



rectangulus, Blackb. 

 disjectus, Blackb. 



infuscatus, Macl. 

 rotundifrons, Blackb. 



lucidus, Blackb. 

 fictus, Blackb. 



cribriceps, Blackb. 



borealis, Blackb. 

 pauper, Blackb. 

 sordidus, Blackb. 



subfuscus, Macl. 



humilis, Blackb. 



