171 



FF. Trilobed outline not as *. 

 G. Frons closely and rugu- 

 losely sculptured ; protho- 

 rax considerably nar- 

 rowed in front. 

 H. Size moderate (3^ 1. or 

 more). 



I. Elytral punctures 



sparse (10 from su- 

 ture reach middle) ... 



II. Elytral punctures 

 much more numerous 



HH. Size very small (2£ 1. 



or less) 



GG. Frons smoothly, coarsely 

 and not closely punc- 

 tured ; base and front of 

 prothorax scarcely differ- 

 ent in width 



DD. Middle lobe of trilobed outline 

 quite sharply angular 



A. Flabellnm of antenna? dark (black or 

 nearly so). 



B. Dorsal surface subopaque, punctures 



very lightly impressed, elytra with 



conspicuous obtuse costa 3 



BB. Not as B. 



C. Lateral margin of pronotum 

 widely expanded close to the 



front angles 



CC. Lateral margin of pronotum even 



sparsus, Blackb. 

 cliens, Blackb. 

 lividus, Blackb. 



diversiceps, Blackb. 

 acutifrons, Blackb. 



potens. Blackb. 



incultus, Blackb. 

 aphodioides, Blanch 



II. Darwini, Blackb. In the description of this species 

 (Proc. Linn. Soc, N.S.W., 1889, p. 435) I called the tooth- 

 like projection of the inner apex of the hind femora "strong 

 but not sharp." This would be better expressed "strong but 

 not very sharp/' the projection being, as a fact, quite evi- 

 dently sharper than in almost any other Heteronyx known to 

 me ; it is usually feeble and blunt. 



H. sequens, Blackb. This species is somewhat close to H . 

 sollicitus, Blackb., but is a smaller insect, of lighter colour, 

 with elytra less closely punctulate, and having the frons more 

 convex so as to appear more distinct from the clypeus, with 

 the clypeal suture more conspicuous. I have seen about a 

 dozen specimens of sequens and about half that number of 

 sollicitus. 



B. pellucidus, Burm. The characters assigned to this 

 species appear scarcely reconcilable with its being a true 

 Heteronyx, especially the front claws of the male "strongly 

 unequal," and the front tibiae with two strong external teeth 

 near the apex and a very small tooth close to the knee. There 

 are Heteronyces (especially in Group VIII.) having a sexual 

 difference in the front claws, but I have not observed any 



