4 CEEAMBIClD.i;. 



<r. First anteunal joint one-third at least longer 



than broad : labrum not triaugulai-. Group Prion:}V. 

 h'-. First antennal joint short, obconic, scarcely 

 longer than broad ; labrum triangular .... 



Group Acant/tophon'm. 

 b' . Tibiae spinose on outer margin ; eyes almost 

 entire ; ligula entire : antennoe of ^T not 



longer than half body Group Caniharocnemini. 



b. Prothorax -svith 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 submedian tooth ; first antennal 



joint short Group Eunipouini. 



h' . Lateral margins of prothorax crenulate or 

 plurideutate ; first antennal joint long or 



moderatelv long Group Macrotomini. 



B. Episterna of metathorax with posteriorly converging 

 sides, narrowly ti'uncate 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, 

 a' . Head sloping in front ; antennse inserted near 



base of mandibles Group ^yosoimni. 



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



distant from base of mandibles .... Group Monodesnmii. 



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 Philim. 



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 prosternuni 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 tlie first joint one-third at least longer than broad. 

 The epiraera 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 (Logcens) there is no strongly-marked 

 sexual difference in the puncturation of the thoi-ax, the sexes 

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

 and form of the mandibles. 



