4 CEEAMBYCID^E. 



' 2 . First antennal joint one-third at least longer 



than broad ; labrum not triangular. Group Priom'w. 

 b' 2 . First antennal joint short, obconic, scarcely 

 longer than broad ; labruui triangular .... 



Group Acanthophorini. 



b' . Tibia? spinose on outer margin ; eyes almost 

 entire ; ligula entire ; antennae of tf not 



longer than half body Group Cantharocnemini 



b. Prothorax -with lateral margins entire or nearly 

 so, or else provided each with a series of several 

 teeth or spines. 



a'. Lateral margins of prothorax entire or with 

 only one small submediau tooth ; first antennal 



joint short Group Eurypodini. 



b'. Lateral margins of prothorax crenulate or 

 pluridentate ; first antennal joint long or 



moderately long Group Macrotomini. 



B. Episterna of metathorax with posteriorly converging 

 sides, narrowly truncate or obtusely pointed at 

 apex. 



a. Third joint of tarsi cleft almost to base ; vein 



Cu. 1 of hind wings simple, not united with 

 vein Cu. 2. 

 '. Head sloping in front ; antennae inserted near 



base of mandibles Group JEyosomini. 



b'. Head vertical in front ; antennae more or less 



distant from base of mandibles .... Group Monodesmini. 



b. Third joint of tarsi cleft to middle only; vein 



Cu. 1 of hind wings branched, united by "a cross- 

 vein with vein Cu. 2 Group Philini. 



Group PRIONINI. 



The genera of this group are distinguished by having usually 

 three teeth or spines on each side of the prothorax, the number 

 being increased to four in one genus and reduced to one in another ; 

 the intercoxal process of the prosternum more or less strongly 

 curved and sometimes subvertical behind, never in the form of 

 a thin flat plate. The clypeus often more or less coriaceous 

 in front ; the labrum always distinct, sometimes narrow and 

 more or less rectangular in form, sometimes semicircular and 

 transverse, but never triangular. The antennae variable in form, 

 but with the first joint one-third at least longer than broad. 

 The epimera of the metathorax prolonged behind so as to pass 

 alongside the outer end of the coxae. The legs sometimes 

 asperate or scabrous, but never spinose. The paronychium 

 small, but usually visible between the claws and in most of the 

 genera setose at the end. 



Except in one genus (Logceus) there is no strongly-marked 

 sexual difference in the puncturation of the thorax, the sexes 

 differ chiefly in the length of the antennae and in the length 

 and form of the mandibles. 



