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. Harpalinw. — Four anterior tarsi dilated in the 



males ; mentum tooth acute, never notched. 



3. Chlceniinm. — 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 



