178 MANUAL OF NATURAL HISTORY. 



slightly toothed within; mentum deeply 

 notched ; body elongate, neck rarely distinct ; 

 elytra entire or slightly notched behind ; an- 

 terior tibiae notched on inner side ; fore-tarsi 

 more or less dilated in the males. 



1. Feroniince. Two anterior tarsi alone dilated 



in the males ; four hind tarsi simple ; central 

 tooth of mentum notched at tip. 



2. Harpalince. Four anterior tarsi dilated in the 



males ; mentum tooth acute, never notched. 



3. Ghlceniince. Front tarsi of males with two, 



three, or four of the basal joints square or 

 cordate. 



The species of this family are exceedingly nu- 

 merous. 



6. FAMILY. Subaquatic-Beetles (Bembidiidae). Max- 



illae with a fixed claw at tip ; labrum trans- 

 verse ; labium quadrate ', maxillary and labial 

 palpi with the last joint minute ; mentum 

 notched ; antennae filiform ; elytra entire ; 

 fore-tibiae not palmate, their inner edge 

 notched; anterior tarsi with one or more 

 dilated joints in the males. Live on the 

 margins of streams. 



7. FAMILY. Marsh-Beetles (Elaphridae). Maxillae 



with a fixed claw at tip ; labrum entire ; 

 mandibles simple; labial palpi 4-jointed, api- 

 cal joint tumid, basal, fixed; mentum notch- 

 ed, with a bifid central tooth ; elytra entire ; 

 anterior tibiae not palmate, without a notch 

 on the side, slightly notched at tip ; fore-tarsi 



