68 KANSAS UNIVERSITY SCIENCE BULLETIN. 



pound eyes. In the heads of Orchelimum, Decticinas and grass- 

 hopper these sclerites are much smaller than in the other speci- 

 mens studied. The smaller the frontal sclerite the larger the 

 vertex. 



7. (0.) The Occi'put, the part of the head behind the ver- 

 tex and surrounding the occipital foramen. This is not always 

 a distinct sclerite, but when it is, as in the Corydalis, it ap- 

 pears to be formed from the tergal portion of the united post- 

 gense. This is present in the grasshopper, Corydalis and 

 Amhlychila. 



8. (G.) The Gense, the lateral portions of the epicranium 

 just back of and below the compound eyes. 



9. (P. G.) The Postgenie. Each gense was divided by a 

 more or less well-marked suture, and the part back of this 

 forms the postgenx. Comstock thinks that it is the upper 

 part or continuation of these that forms the occiput. Packard 

 thinks the postgense are distinct from the occiput, which he 

 considers as a part of the labial segment. I favor Comstock's 

 view, for, in the grasshopper especially, the occiput seems so 

 evidently a continuation of the postgense. 



10. (Gu.) The Giila, which is often absent, when present 

 forms the ventral wall of the hind part of the head, and bears 

 the labium or second maxillae. 



11. The Cervical Sclerites, the sclerites of the neck. Of 

 these there are dorsal, ventral, and lateral ones. 



There are two dorsal cervical sclerites in the neck of the 

 cockroach. In Amhlychila I distinguished none. 



Melanophis has two lateral cervical sclerites on each side. 

 Between these is a prominent apodeme. I also found what ap- 

 peared to be a smaller apodeme on each side. In Amblychila 

 there are two small chitinized spots, one on each side, which 

 are probably vestiges of the lateral cervical sclerites. 



In the cockroach there are two ventral cervical sclerites ; in 

 the cricket there are five, arranged in two series ; in Stenopcl- 

 matus there are three, arranged in two series ; in Corydalis and 

 Amhlychila these sclerites are not found, but the gula is 

 present. 



Snodgrass thinks that these cervical sclerites do not belong 

 to the head, but to thorax. He designates them as the micro- 

 thorax. 



