Coleopterological Notices, IV. 5*73 



some cases, the male appears to be entirely devoid of secondary 

 sexual characters. 



In fact within the limits of the genus as thus defined by mandi- 

 bular structure, many characters which are of generic importance 

 elsewhere, such as the degree of separation of the coxae, nature of 

 the prosternal impression and conformation of the prothoracic apex, 

 lose all significance of this kind and are merely useful in denning 

 groups. In all probability some of these sexual groups are worthy 

 of a separate designation, but with my present lack of sufficiently 

 exact knowledge concerning the numerous tropical forms, it would 

 be manifestly inappropriate to do more than simply indicate those 

 which exist within our own fauna ; this has been attempted in the 

 following table : — 



Male with an erect or oblique process of greater or less length before each 

 anterior coxa ; antennal scape not attaining the eye ; tarsal claws slender, 

 not excavated beneath. 

 Anterior coxae narrowly separated ; body robust. 



Beak thick, the antennae inserted beyond the middle, at least in the male ; 



prothorax strongly tubulate at apex I 



Beak very slender, the antennae inserted far behind the middle in both 

 sexes, with the scape very short, coming far from attaining the eyes ; 



much smaller species II 



Anterior coxae widely separated, the beak moderately slender, often more or 

 less inflated toward base in the female, the antennae inserted at a greater 



or less distance behind the middle Ill 



Male with two short arcuate prosternal processes ; anterior coxae rather widely 

 separated, the prosternum fiat, with a small subapical excavation ; man- 

 dibles aberrant, small, widely separated, the inner edge outwardly oblique 

 and broadly arcuate toward apex, deeply notched externally beneath ; 

 tarsal claws aberrant, long, stout, widely divergent, excavated beneath 

 throughout their length ; elytra with quasi-denuded transverse inter- 

 rupted bands IV 



Male without trace of prosternal or antennal modification, but with the ante- 

 rior trochanters dentate; anterior coxae moderately separated, the pro- 

 sternum flat ; beak somewhat stout, the antennae inserted a little behind 

 the middle, the club of peculiar structure, the two basal joints together 

 comprising but slightly more than one-half the mass, the first often much 



shorter than the second V 



Male entirely devoid of secondary sexual modification of the antennae, pro- 

 sternum or trochanters. 

 Anterior coxae rather widely separated. 



Prothorax subtubulate at apex ; elytral vestiture quasi-denuded in small 

 spots ; beak slender, rather feebly arcuate, the antennae inserted behind 

 the middle in both sexes, the scape rather long and almost attaining 

 the eye; tarsal claws long, normal in structure VI 



