72 KANSAS UNIVERSITY SCIENCE BULLETIN. 



7. Labial or Second Maxillary. 



Tergal s'clerites. — Probably dorsal cervical sclerites. 



Sternal sclerites. — Ventral cervical sclerites and gula. The 

 ventral sclerites are often arranged in two series, showing the 

 subsegments, and divided into two or three in each segment, 

 showing the lateral and median fields. In some insects, as 

 adult of Corijdalis and Amblycliila, they have united to form 

 the gula. 



Pleural sclerites. — Lateral cervical sclerites. These sclerites 

 are best shown in Melanoplus. These under high-power lenses 

 showed one prominent apodeme and one smaller one. Corn- 

 stock mentions but one apodeme, and thinks that it helps to 

 prove that these are the epimeron and episternum of a seg- 

 ment. The posterior of these sclerites articulates with the epi- 

 sternum of the prothorax, and the anterior one with what we 

 believe to be the epimeron of the maxillary segment. I do not 

 know what the smaller apodeme signifies. 



Appendages. — Second maxillae or labium. 



BIBLIOGRAPHY. 

 COMSTOCK AND Kellogg. Elements of Insect Anatomy. 

 CoMSTOCK AND KocHl. The Skeleton of the Head of Insects. 



FOLSOM, J. W. 



(a) The Anatomy and Physiology of the Mouth Parts of the Collem- 



bolan Orchesella cincta. 

 (6) The Segmentation of the Insect Head. Psyche, vol. VIII, 



p. 391. 

 (c) The Development of the Mouth Parts of Anurida maritima. 

 Bui. Mus. Comp. Zool., vol. XXVI. 

 KoRSCHELT AND Heider. Textbook of the Embryology of Invertebrates. 

 Packard. Textbook of Entomology. 

 Snodgrass, R. E. a Comparative Study of the Thorax in Orthoptera, 



Euplexoptera and Coleoptera. 1907 Proceedings of the Ent. Soc. 

 Wheeler, W. M. A Contribution to Insect Embryology. 



