236 Journal New York Entomological Society, t^'o^- >^xv. 



1903. Verhoeff. U. d. Endsegmente des Koerpers der Chilopoden, Dermap- 



teren und Japygiden, in : Nova Acta K. L. C. D. Akad. Naturf., 

 LXXXI, p. 259. 

 1914. Walker. A New Species of Orthoptera, Forming a New Genus and 

 Family, in : Can. Ent., 46, p. 93. 



1904. Wheeler. Phylogeny of Termites, in: Biol. Bull., 5. 



1902. Wandollek. U. d. Gliedmassennatur der Styli, in: Verb. Deutsch. 

 Zool. Gesell. Leipzig, Jg. 12, p. 193. 



Abbreviations. 



b, basal sclerite of valve of ovipositor (Basivalvula). 



s, ccrcus. 



d, dorsal valvula of ovipositor (Survalvula). 



/, basal sclerite of valvula of ovipositor (Valvifer). 



♦, intermediate valvula of ovipositor (Intervalvula) se'rving as egg-guide. 



/, lora of ovipositor (Valvilora). 



m, large stylus (Megastylus), usually only one retained in Pterygota. 



o, pericercal (sense) organs. 



p, podical plate (Subcercus), or cercus-bearing plate, a portion of the nth 



segment. 

 s, subgenital plate (Subgenitale). 

 St, stylus. 



t, terminal filament. 

 V, ventral valve of ovipositor (Subvalvula). 



Numerals denote the number of the abdominal segment in question, the 

 letter " t " written above the numeral denotes the tergum of that segment, 

 and the letter "s" denotes the sternum. The numeral "11" denotes the 

 suranal plate (Pygidium). 



Explanation of Plates XVI and XVII. 

 (All figures are of females.) 



Fig. I. Terminal abdominal structures of Grylloblatta ; lateral view of 

 sinistral half of the body, showing 6th to the nth segments. 



Fig. 2. Terminal structures of a Lepismid ; cerci removed and terminal 

 filament partially cut off. Position of cercus indicated by letter " c." 



Fig. 3. Segments 6 to 10 of the Phasmid Ectatosoma. 

 • Fig. 4. Terminal structures of an immature Plecopteron Pteronarcys. 



Fig. 5. Terminal structures of a " Blattid," Dasyposoma. The over- 

 lapping portions of the preceding segments have been removed. 



Fig. 6. Terminal structures of the Orthopteron Paranabrus (a " Lo- 

 custid "). Ovipositor partially removed. 



Fig. 7. Terminal structures of the " Mantid " Stagnwmantis (?). Over- 

 lapping ventral portion of 8th segment removed, the point of attachment 

 being indicated by black area. 



