140 



Annals Entomological Society of America [Vol. XI, 



V. EXPLANATION OF PLATES. 



Abbreviations. 



The following plates include figures of the posterior somites and appendages 

 of the male and female forms of the insects studied. Other accessory points, such 

 as external openings and their connections with their ducts, arp shown wherever 

 possible. Everything has been carefully and clearly labeled according to the 

 following: 



I Appendage of Somite Eight. 



II Appendage of Somite Nine. 



Ill Appendage of vSomite Ten. 



IV Appendage of Somite Eleven. 



tl-tll Terga One to Eleven. 



tl2 Terga Twelve of Heymons. 



sl-sll Sterna One to Eleven. 



A Anus. 



Ab Anal Brush. 



Ap Apodeme. 



As Appendages. 



C Cerci. 



Con Conjunctiva. 



Cop Bursa Copulatrix. 



Cp "Copulatory sacs. 



D.; Ejaculatory Duct. 



G Gland. 



Ov Oviduct. 



R Rectum. 



Rp. Respiratoria. 



S Spermatheca. 



Sp Spiracle. 



St Stylet. 



Tr Tracheae. 



V Vagina. 



Vd Vas deferens. 



Plate IV — Primitive Type and Thvsanura. 

 Primitive type, Fig. 1, ventral view. 



Machilis sp., 2, 9, mesal view; 3, 9, ventral view; 4, cf, ventral view. 

 Lepisma saccharina, 5, 9, dorsal view; 6, 9, ventral view; 7, 9, mesal view; 8,' 



9, ventral view; 9, d', dorsal view; 10, cf, ventral view; 11, d', mesal view; 



12, 13, cf , ventral views. 



Plate V — Orthoptera. 



Periplantea orientalis, 1, 9 , lateral view; 2, 9 , dorsal view; 3, 4, 5, 6, 11, 9 , caudal 

 views; 8,cf, ental and mesal view; 9, 9, ental view; 10, d, ventral view; 13, 

 (d, mesal view; 16, cf, dorsal view. 



Dissosteira Carolina, 7, 9 , dorso-caudal view. 



Mantis sp., 12, 9 , lateral view; 14, 9 , ventral view; 15, 9 , ental view. 



Melanoplns differential is, 17, cf, dorso-caudal view. 



Plate VI — Orthoptera. 



Melanoplus differentialis, 1, 9, lateral view; 2, 9, mesal view; 4, 9, mesal view; 



5, 9 , lateral view; 6, cf, lateral view; 7, 9 , ental view; 9, cf , ventral view; 



11, 12. cf, mesal views; 13, cf, dorsal view; 16, cf, dorsal view; 17, 9, dorsal 



view; 18, cf, lateral view; 19, 9, ventral view. 

 Dissosteira Carolina, 3, cf, ental view; 8, cf, caudal view; 10, 9, lateral view; 14, 



9 , ental view; 15, 9 lateral view; 20, 9 , mesal view. 



Plate VII — Orthoptera. 



Gryllus pennsylvanicus, 1, 5, 10, caudal views; 2, lateral view; 3, 6, ventral views; 



7, 9, dorsal view; 8, cf, lateral and ental views; 9, cf, ventro-caudal view; 



10, cf , caudal view; 11, cf , ventral view; 12, cf , dorsal view; 15, 9 , mesal view. 

 Dissosteira Carolina, 4, cf , caudal view. 

 Xiphidium ensiferum, 13, cf, dorsal view; 14, 17, cf, caudal view; 16, cf , ventral 



view; 18, 9, dorso-lateral view; 19, 9, dorsal view. 



