NO. 7 



THE INSECT CRANIUM — SNODGRASS 



19 



have a large frontal area on the anterior surface of the head (fig. 5 G, 

 Fr), the arms of the cleavage line are either transverse (D, F), or 

 they curve posteriorly to points before the eyes (E). In such species 



Fig. 5. — Homoptera. 



A, Magicicada septendecim (L.), Cicadidae, head and pronotum of last nymph, 

 dorsal view. B, same, exuviae of head and prothorax. C, same, head and 

 pronotum of adult. D, Catonia nava (Say), Fulgoroidea, head and pronotum of 

 nymph. E, Epiptera florida (Walk.), Fulgoroidea, head and pronotum of nymph. 

 F, Catonia nava (Say), Fulgoroidea, dorsal part of exuviae of head. G, Ormenis 

 pruinosa (Say), Fulgoroidea, facial view of head of adult. H, Hyadaphis 

 xylostei (Schrank), Aphididae, exuviae of head, dorsal. I, same, exuviae of 

 head and prothorax, ventral. 



the vertex is cut at ecdysis into a pair of parietal plates bearing the 

 compound eyes (F), or the eye lobes of the nymphal cuticula (B). 

 In the Homoptera, at least in the nymph, the frons and the post- 



