64 FAMILY IT. CAliABlD/E. 



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

 hy liftino- one of the elytra. Its pni-pose is to afford a means of 

 support to the edge of the al)domen. and at the point of origin of 

 the fold liehind, tlie last ventral segment is held firmly when the 

 insect is in repose. 



Section I. IIARPALIX-E 7?/,s7i7'O.S'.i'. 



This section is di^'idtd 1)y irorn into 2-i trilies, of which 12 are 

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

 probably occur. 



KKY TO IM)IAi\A IHniKS OK 1 1 AKPALI i\.K Itl.SKTOS.E. 



(I. ,M;iii(lilil('s Willi M liristlc-licnriiiu' piiiii-lui-c in llu" .i^roiivc (scnihc) oii 

 the outer side. 

 h. Aiiteiinu' slciidcr, willi ,il inusl t\\ > li;is;il Jniuts .^-Inhrous ; ;ih(l(iiniii:il 

 segments eiitii'clN- coniccus <ir In.ni-likc. 

 c. Liist joint of ]ial|ii iiwi-sliapcd ; iiicsustcrnal cpiiiicra wide ; Icugtli 

 less than 8 mm. Trilje IV. Bembidhni, p. G7. 



<■<: I^ast joint of palpi slender. (>lMn.i;ate oi- snhcylindrical; mesoster- 

 nal epimera narrow. Trilie \'. Pogonini. p. SO. 



hi), .\ntenna' moniliferni or bead-like. Ii nr liis:i! .jiints .glabrous; ab- 

 dwnnnal se.L^nients .'!, 4 and ."> narr.iwly ( iri.-iceiins or leather-like 

 on their hind margins. Tribe II. Nomiini, p. 00. 



(Id. Mandil)les without a I»ristle-beai-in,i; pumlure in the scrobe. 



(1. Margin of elytra interrupted at |)o>;tei-inr third and witJi a distinct 

 internal fold. 

 ('. I'our basal jonds of antennie glabrnns; body sligldly pedunculate;, 

 anleini;e niMniliforni ; frcait liiiia' dilatt'd ; lenntli IL' !('. mm. 



Tribe 111. Mohioxim, p. <',(;. 

 (■<■. Three (or fewer) basal Joints (if ;intenn:e glalir..us. 



/. Head constricted behind tlie eyes, tlien dilated ti) a senn-ghilm- 



lar neck; last .ioint of maxillary palpi ai'ising obliquely frmn 



the preceding joint. Tribe I. PANAG,5i:i>ii. i>. <m. 



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



liali)i arising normally from the end of the preceding joint. 



Tribe VI. Pterostichini. p. 88. 

 */(/. Margin of elytra not interru]ited |)osteriorly and without an internal 

 fold. 

 (I. Front of head short; labrum impressed. 



Tribe VII. Ltcinkm, p. 112. 

 ;/;/. Front of head normal. 



li. Next to last joint of labial imlpi with but two bristly hairs. 



/. H(>ad elongate. la-olouLCed behind the eyes; neck consti-icted 

 and dilated behind iido a seniiglobular knob. 

 j. Elytra entire. Ti'ibe .\. ('iKNonAcrvLiM, p. l.'tT. 



//. l''lyti-;i tnuiiati'; three basal jninls of antenn;e glal)rous. 



Tribe XI. Opacanthini, p. 138. 



