NO, I THE INSECT HEAD — SNODGRASS 



Gu Poc « For 



27 



Prrnt 



Fig. 13.— Formation of the gula. Tentorial pits (pt) at base of labium, under 

 surface of head lengthened proximal to pits. 



A, Silpha sp., larva, Coleoptera, gula (Gu) a ventral sclerotization of the 

 neck, proximal to the tentorial pits (pt). B, Melandrya striata, adult, Coleop- 

 tera, gula enlarged. C, Epicauta, marginata, adult, Coleoptera, gula elongate, 

 united with base of labium (S7nt). D, Corydalns cornutus, larva, Megaloptera. 

 E, Staphylinus cinnamopterus, adult, Coleoptera, gula compressed between post- 

 genae (Pge). 



relations to the base of the labium, but the gula and the labium be- 

 come sclerotically continuous. The labiogular plate has been termed 

 the "gulamentum," but the labial part involved is either the post- 



