NO. 7 



THE INSECT CRANIUM SNODGRASS 



43 



the margins of the cranial sclerotization above the postantennal mem- 

 branes containing the organs of Tomosvary (A, C), and converge 

 posteriorly to points close to the base of the median cranial ridge. 



OT 



Md 



:Md 



Fig. 15. — Symphyla and Diplopoda. 



A, Scutigerella immaculata (Newp.), Symphyla, head of adult, dorsal. 

 B, Habrostrepus sp., Diplopoda, head of adult. C, Scutigerella immaculata 

 (Newp.), Symphyla, head of adult, lateral. D, Hanseniella agilis Tiegs, Sym- 

 phyla, head of adult, lateral (outline from Tiegs, 1940). E, Apheloria coriacea 

 (Koch), Diplopoda, head of adult, lateral. 



In discussing these head lines of Scutigerella, Ferris (1942, p. 29) 

 makes the following remarkable statement: "Another transverse 

 suture begins at the side of the head, immediately in front of each 

 primary mandibular articulation. For a short distance it coincides 



