BY THE REV. T. BLACKBURN. 427 



D. Trilobecl outline of head well 

 defined ; middle lobe narrow ; 

 club of antennfe black potens, Blackb. 



DD. Trilobed outline of head scarcely 

 apparent ; middle lobe very 

 wide ; club of antennte pale aridus, Blackb. 



BB. Ui)permost tooth on external margin 

 of front tibi83 reduced to a mere 

 ' nick on the outline bidenfatus, B'lackb. 



AA. Hind cox?e decidedly shorter than 

 lateral suture of metasternum 



B. Club of antennae black or nearly so.. .. 



C, Puncturation of prothorax sparse and 

 lightly impressed 



D. Middle lobe of trilobed outline of 

 head from all points of view 

 projecting beyond the lateral 

 lobes which are scarcely defined cqyJiodioides, Blanch. 



DD. Middle lobe of trilobed outline 

 of head not appearing to pro- 

 ject beyond the lateral lobes 

 which are well defined incultus, Blackb. 



CC. Puncturation of prothorax strong 



and close asjpericoUis, Blackb. 



BB. Club of antennse pale in colour 



C. Relation of labrum to clypeus such 

 that the outline of the head is dis- 

 tinctly trilobed from a certain 

 point of view 



D. Middle lobe of trilobed outline 

 appearing rounded 



