LARVAL FORMS OF COLEOPTERA 



Tenth seo:meiit witli no scansorial hooks; claws normal 3 



3. Mandible faleate, at least three times as long as wide at base 



(Ketiiiaculnm placed at base or in the middle of the inner 



edjre) 4 



Mandible robust, about twice as long as wide at base, or 

 shorter. (Retinaculum never placed at base ; each leg often 

 with claws of different sizes) 19 



4. Mandible multiserrate in front of retinaculum ; nasale not pro- 



jecting but armed with a transverse series of several sharp 

 teeth of the same size ; two claws of equal size ; urogomphi 



inunovable Odacavfhinae {Odacanfha, Lep- 



iotnichelns, a n d Casnonia 



Combination of the four characters different 5 



5. Mandible not serrate in front of retinaculum and without 



groove for antenna ; antenna inserted outside of mandible ; 

 urogomphi movable and long ; head round and usually large ; 



collum constricted and narrow (except in Pclophila) 6 



Different combination of the characters 7 



6. Prementum with lateral setae. (Coxa of front leg with inner 



margin of a groove for reception of femur armed with long 

 spines; urogomphi multijointed) 



Driptinae {Gal er if a ) 

 Prementum without lateral setae. (Urogomphi not jointed, 



finely nodose) Nehriinae {Noiiopliilus, Pelo- 



phila, Nehria, and Leistus) 



7. Dorsal shield of ninth abdominal segment very small ; ligula 



broadly rounded and multisetose ; mandible with distal part 

 beset with appendices; retinaculum serrate; inner corner of 

 mandible receding at base. (Stipes large, swollen; palpus 



shorter than galea) Loricerinae (Loricera) 



Dorsal shield of ninth abdominal segment distinct ; ligula with 

 a pair of setae ; mandible without appendices and Avith inner 

 corner projecting 8 



8. Urogomphi fixed, short, strong, and pointed ; prementum with- 



out lateral setae ; stipes maxillaris subquadrate, depressed 9 



Urogomphi different; prementum Avith lateral setae; stipes dif- 

 ferent 10 



9. Retinaculum with posterior margin simple ; urogomphi antler- 



like in mature larvae ; labial palpus with apical joint simple 

 and ovate, or terminally cleft. (Ligula distinct in Cdlosonia, 

 miiuite in most species of Carahus) 



Canihinae (CoIosoiiki, Carahus, 

 Dinuasff}', and P)-()C('i'us) 

 20 



