LAEVAL FORMS OF COLEOPTERA 



H. BYRRHOIDEA 



The series contains only one family, the Byrrhidae. The genus 

 Nosodendron is often placed in this family but belongs, according 

 to the larval characters, in the subsequent series Dascilloidea, con- 

 stituting a special family, Nosodendridae (p. 44). 



Key to Subfamilies 



1. Distal half of the mandibular inner edge entire between the tip 



and a low tooth at the middle of the edge 



Byrrhulae-Bijrrhinae (pis. 61 

 A-K, 62 A-B, D-H) 

 Distal half of the mandibular inner edge multidentate 2 



2. Tenth abdominal segment with a pair of hooks 



Byrrhidae - Amphicyrtinae (pi. 

 62 C, I-L) 

 Tenth abdominal segment without hooks. (Labrum with an- 

 terior margin deeply emarginate sagittally) 



Byrrhidae- Liooninae (pi. 62 

 M-R) 



I. DASCILLOIDEA 



This series does not conform with the series named Dascilloidea 

 in the classification of the imagines but it has been considered ex- 

 IDcdient to retain the old serial name in the present tabulation of 

 families which according to the larvae seem properly associated 

 with the genus Dascillus. The larval characters of the Eucinetidae 

 indicate that this family belongs in the series Cucujoidea (p. 33), 

 or possibly in the leptinid association of the Staphylinoidea near 

 the family Ptiliidae (p. 26). 



Key to Families and Subfamilies 



1. Eighth abdominal segment of normal form and not terminal ; 



ninth abdominal segment large ; spiracles cribriform. (Nine 



pairs of spiracles always present and all lateral) 2 



Eighth abdominal segment large and terminal ; ninth ab- 

 dominal segment vestigial ; spiracles annuliform or biforous. 

 (Either with nine pairs of spiracles present and well de- 

 veloped, or with all vestigial except those on eighth abdomi- 

 nal segment ; the latter large and close together below 

 posterior end of eighth tergite) 3 



2. Tenth abdominal segment almost obliterated and without soft, 



terminal prolongation ; ocelli absent ; antenna long ; maxil- 



43 



