LARVAL FORMS OF COLEOPTERA 



FAMILIES, SUBFAMILIES, AND OCCASIONALLY 



TRIBES 



In the taxononiic arrangement of the larvae, each series includes 

 usually a <ireater or smaller number of families, subfamilies, and 

 minor subdivisions. In proper order, keys to the families, subfami- 

 lies, and occasionally tribes of each of the series listed on page 10 

 are given below. 



A. CUPESOIDEA 



Key to Families 



1. Xinth abdominal segment extended terminally into a single, 

 conical, straight process, ventrally with a simple, transverse, 

 narrow sternal plate ; leg short, conical ; tarsus carrying one 

 bifurcate claw with subequal tips. (Polymorphic larval 



metamorphosis lacking) Cupesidae (pi. 1 A-G) 



Ninth abdominal segment with terminal process bent downward 

 and directed toward a similar but upward bent process from 

 the sternal plate; leg (in instar in which fully developed) 

 provided with a long, slender tarsus carrying two claws of 

 equal length. (Polymorphic larval metamorphosis present 

 with partly paedogenetic cycle of larval generations.)-^ 



MicroDialfhidae (pi. 2 A-J) 



B. CARABOIDEA 



Key to Families 



1. Labial palpi latent; prementum and ligual fused into an 



unpaired anteriorly bilobed piece. (Retracted ventral mouth- 

 l^arts; one claw.)--^ 



RJn/so(]i(hte (pi. 3 A-J) 

 Labial palpi distinct and jointed 2 



2. Ninth abdominal segment present; eighth abdominal segment 



never terminal. (One or two claws) 3 



Ninth abdominal segment rudimentary; eighth long, conical, 

 appearing as the terminal segment of the body. (Two 

 claws) 7 



3. Tenth abdominal segment developed as a pygopod for loco- 



motory purpose 4 



Tenth abdominal segment not developed as a pygopod 6 



21 Barber, H. S., Proe. Biol. Soc. Wash., vol. 26, 1913, pp. 185- 

 190. 



22" Peyerimhoff, P. de, Rev. d'Ent. vol. 22, 1903, pp. 80-84, one 

 plate. 



]6 



