64 



FAMILY II. CAKABID^E. 



The internal elytral fold mentioned in the key can only be seen 

 by lifting one of the elytra. Its purpose is to afford a means of 

 support to the edge of the abdomen, and at the point of origin of 

 the fold behind, the last ventral segment is held firmly when the 

 insect is in repose. 



Section I. HARPALINJE BISETOSM. 



This section is divided by Horn into 24 tribes, of which 12 are 

 known to be represented in Indiana, while members of two others 

 probably occur. 



KEY TO INDIANA TRIBES OF^HARPALIN,E BISETOSiE. 



(/. Mandibles with a bristle-bearing puncture in the groove (scrobe) on 

 the outer side. 



1). Antenme slender, with at most two basal joints glabrous ; abdominal 

 segments entirely corneous or horn-like. 

 c. Last joint of palpi awl-shaped ; mesosternal epimera wide ; length 

 less than 8 mm. Tribe IV. Bembidiini, p. 67. 



cc. Last joint of palpi slender, elongate or subcylindrical ; mesoster- 

 nal epimera narrow. Tribe V. Pogonini, p. 86. 

 hi). Antennas moniliform or bead-like, four bn sab joints glabrous; ab- 

 dominal segments 3, 4 and 5 narrowly coriaceous or leather-like 

 on their hind margins. Tribe II. Nomiini, p. 66. 

 aa. Mandibles without a bristle-bearing puncture in the scrobe. 



(?. Margin of elytra interrupted at posterior third and with a distinct 

 internal fold. 



e. Four basal joints of antenme glabrous ; body slightly pedunculate ; 

 antennae moniliform ; front tibiae dilated ; length 12-16 mm. 



Tribe III. Morionini, p. 66. 

 ee. Three (or fewer) basal joints of antenme glabrous. 



f. Head constricted behind the eyes, then dilated to a semi-globu- 

 lar neck ; last joint of maxillary palpi arising obliquely from 

 the preceding joint. Tribe I. Panag.eini, p. 65. 



//. Head not constricted behind the eyes; last joint of maxillary 

 palpi arising normally from the end of the preceding joint. 



Tribe VI. Pterosticrtni, p. 88. 

 dd. Margin of elytra not interrupted posteriorly and without an internal 

 fold. 



g. Front of head short ; labrum impressed. 



Tribe VII. Licinini, p. 112. 



gg. Front of head normal. 



h. Next to Inst joint of labial palpi with but two bristly hairs. 

 i. Head elongate, prolonged behind the eyes; neck constricted 

 and dilated behind into a semiglobular knob. 

 j. Elytra entire. Tribe X. Ctenod a ctylini, p. 137. 



■)}. Elytra truncate; three basal joints of antenme glabrous. 



Tribe XL Odacanthini, p. 138, 



