18 " GKODErilAlLV — CAIIAIUDAE. 



I. Emargination of mentiim with one tooth. 



1. Third joint of anteiniae cylindrical. 



Labruiu more or less emarginate; mandibles thicldy 

 covered witli yellowish-red hair at the base of the inner 

 margin, with a projection in the middle ; emargination of 

 mentum with a simple tooth as long as the side pieces, 

 jjaraglossae free at apex and equal in length to the ligula ; 

 third joint of antennae a little longer than the rest, apical 

 joint of palpi somewhat hatchet-shaped ; elytra oval ; 

 wings usually absent or rudimentary ; first four joints of 

 the anterior tarsi dilated in the male. CarahuH, Lin. 



2, Third joint of antennae compressed at base. 



Thorax short, broad, rounded at the sides ; elytra oblong, 

 square in front, rounded off behind ; mandibles broader 

 than in Carahiis, less hooked, transversely striate above ; 

 labrum emarginate ; the tooth in emargination of mentum 

 sliarp and always considerably shorter than side pieces ; 

 paragiossae soldered to ligula and usually a little longer 

 than it ; third joint of antennae longer than the rest ; 

 wings generally present ; first four joints of the anterior 

 tarsi dilated in the male. Calosoma, AVeber. 



II, Emargination of mentum with two teeth. 



1, Mandibles toothed near base on inner-side. 



Labrum almost straight in front ; mandibles dissimilar, 

 the left one being straight on the inner-side while the riglit 

 one is dilated at the base and suddenly narrowed in the 

 middle ; maxillae with several long bristles on the outer- 

 side ; apical joints of palpi elongate, somewhat dilated and 

 truncate at the apex ; third joint of antennae as long as, 

 or longer than the first joint ; thorax more or less heart- 

 shaped, with fiattened sides and a raised lateral margin ; 

 elytra with nine striae and a short one at base near the 

 suture. The British species are winged. Anterior tarsi of 

 male with three joints dilated and spongy beneath. 



Nelria, Latr. 



2» Mandibles not toothed on inner-side. 



Last joint of palpi a little more elongate than in Nelrid, 

 antennae and legs a little longer. Felo2}hila, Dej. 



b. Maxillae with long prominences on the outer-side, 

 each beariii''' a moveable bristle. 



