1919] Walker: Structure of Orthopteroid Insects 315 



EXPLANATION OF PLATES. 



Reference Lettering. 



ap 8, 9 — apodeme of segment 8 or 9. pa — paraprocts. 



ar — basal arch. pap — process of intersegmental apodeme. 



be — basipodite of cercus. pp — ventral prominence of pons. 



bs — basivalvula. pvd — sub-basal process of dorsal valvula. 



c — cercus. rm — rami of inner valvulae. 



cf — ^caudal filament. sa — supra-anal plate. 



clg — coxal gland sap — superior apophysis. 



ex — coxite. sp — spiracle. 



eg — egg guide. spth — aperture of spermatheca. 



ga — genital aperture or vulva. st — sternum, sternal region. 



him — internal lamella joining bases of ste — sternite. 



inner valvulae. stl — stylus. 



iap — inferior apophysis. sv--— superior intervalvula. 



int ap — intersegmental apodeme. tg — tergite. 



im— interval vular membrane. vd — dorsal valvula. 



iv — inferior intervalvula. vf — valvifer. 



lb — inferior lobes of inner valvulae. vi — inner valvula. 



p — pons valvularum. vv — ventral valvula. 



Plate XX. 



1. Ceulhophilus lapidicola, adult; lateral view of end segments and ovipositor, 



ventral and inner valvulae bent downwards. 



2. Same, not quite mature; dorsal view of ovipositor, left ventral valvula bent 



outwards, right not shown. 



3. Same, adult; ventral view of ovipositor. 



4. Same, inner view of structures at base of ovipositor. 



5. Conocephaliis fascialus, adult; lateral view of end segments and basal part of 



ovipositor. 



6. Same; ventro-lateral view. 



7. Same; dorsal view of superior intervalvula and basal connections of inner 



valvulae. 



8. Same; anterior view of base of ovipositor. 



9. Same; ventral view of end segments of nymph four mm. long. 

 10. Same; same view of nymph five mm. long. 



Plate XXI. 



IL Gryllus assimilis, adult; lateral view of end segments and base of ovipositor. 



12. Same; ventro-lateral view. 



13. Same; dorsal view of ovipositor, left ventral valve bent outwards, right not 



shown. 

 1 . Same; inner view of structures at base of ovipositor, left side. 



15. Same; anterior view of base of ovipositor. 



16. Oecanthus quadripimctatus, adult; lateral view of end segments and base of 



ovipositor. 



17. Same; inner view of structures at base of ovipositor, left side. 



18. Same, nymph; ventral view of end segments and ovipositor. 



19. Ripipteryx forcipata Sauss., adult; lateral view of end segments and ovipositor. 



20. Same; dorsal view. 



21. Same; ventral view. 



Plate XXII. 



22. Melanoplus hivittatus, adult; postero-lateral view of end segments and 



ovipositor. 



23. Same; postero-dorso- lateral view of cleared preparation. 



24. Same; posterior view of ovipositor, with valvulae forced widely open. 



25. Same; ventral view of ventral valvulae. 



26. Acrydiiim ornalum, adult; lateral view of end segments and ovipositor. 



27. Same; dorsal view. 



28. Same, nymph; lateral view. 



29. Same, nymph; dorsal view. 



30. Same, adult; ventral view of ventral valvulae. 



