io8 MEMOIRS ON THE COLEOPTERA 



2 Pronotum similar in the sexes, except in the Cheiroplatids, never 

 having elongate corniform processes in the male 3 



Pronotum dissimilar in the sexes, having more or less developed corniform 

 processes in the male as a rule, either on the prothorax alone or on 

 both the head and pronotum 5 



3 Post-coxal process of the prosternum obsolete as in Agaocephalini; 

 slender filiform hind tarsi and slender mandibles nearly as in Cyclo- 

 cephalini, the elytra similarly variegated in color but with thicker 

 integument; clypeus as in Pentodontini; pronotum with an asexual 

 indentation; middle and hind tibiae densely and asperately sculp- 

 tured; antennal club long, especially in the male. . *ORYCTOMORPHINI 



Post-coxal process distinct as usual, though sometimes nearly concealed 

 in a thick brush of hair; tibiae never sculptured as in the preceding 

 tribe 4 



4 Pronotum never impressed or foveate; tarsi slender and Melolonthid 

 in form, the anterior usually strongly modified in the male; mandibles 

 usually slender, broader in the Dyscinetids; integuments not very 

 dense as a rule, sometimes very thin and frequently variegated in 

 color; stridulating structures always wanting. .. CYCLOCEPHALINI 



Pronotum with or without an anterior impression, which is always 

 asexual except in the Cheiroplatids; tarsi shorter and more tapering, 

 with triangular and externally produced basal joint as in Oryctini; 

 anterior tarsi unmodified in the male, except in Ligyrodes, Hetero- 

 nychus and Corynoscelis; integuments thick, never variegated in 

 color; body generally stout in form, with or without stridulating 

 apparatus PENTODONTINI 



5 Tarsi shorter, more tapering, with triangular basal joint as in Pen- 

 todontini ORYCTINI 



Tarsi long, filiform though thick, the basal joint not or scarcely trian- 

 gular 6 



6 Post-coxal process of the prosternum large and evident; body very 

 large in size, smooth, never metallic.. DYNASTINI 



Post-coxal process obsolete; body smaller, the corniform processes less 

 developed; coloration frequently metallic a very exceptional 

 character in the subfamily *AGAOCEPHALINI 



7 Body generally more or less oblong and flattened above, usually deep 

 black in color and with thick, dense and strongly sculptured integu- 

 ments; crests and tubercles of the head and pronotum similar in the 

 sexes as a rule; tarsi nearly as in Oryctini PHILEURINI 



The tribes Oryctomorphini and Agaocephalini are almost purely 

 South American and need not be dwelt upon more fully at this time; 

 the former, as represented by Oryctomorpha, is in fact confined to 

 Chile; it is so composite and isolated in structure, that to place it 

 near the Pentodontini in the table would destroy the desirable 

 continuity brought about by placing Ligyrodes next after Dyscinetus 

 and the Oryctini immediately after Bothynus and Anastrategus 

 of the Pentodontini; so I have eliminated it from the general series 



