74 Annals Entomological Society of America [Vol. XV, 



44. Oecanthus nigricornis Walk. Dorsal view of separated genitalia; potash 



preparation. 



45. Same, posterior view of genitalia. 



46. Same, lateral view of genitalia; potash preparation. 



47. Ripipteryx carbonaria Sauss. (Tridactyloidea). Dorsal view of terminal 



segments, ch, copulatory hooks, apparently arising from the paraprocts. 



48. Same, lateral view of terminal segments. Lettering as in Fig 47. 



49. Same, dorsal view of penis; potash preparation. In front of the reflected 



integument (int) the organ lies beneath the outer surface. 



50. Same, right lateral view of penis; potash preparation. 



Plate VI. 

 (Orthoptera — Acridoidea). 



51. Dissosteira Carolina h. Dorsal view of terminal segments. 



52. Same, dorsal view of genitalia; potash preparation. 



53. Same, ventral view of genitalia; potash preparation. 



54. Same, lateral view of genitalia; potash preparation. 



55. Melanopliis bivittatus (Say). Dorsal view of genitalia; parts in their natural 



position. 



56. Same, dorsal view of genitalia with the pseudosternite omitted; potash 



preparation. The dorsal and ventral lobes are spread apart so as to show 

 their relations to the parameres and to one another. 



57. Same, ventral view of genitalia; potash preparation. The ventral lobes 



are spread apart to show the entire parameres. The ejaculatory duct 

 is cut off at its junction with the spermatophore sac. 



58. Tettigidea lateralis parvipennis (Harr.). Left lateral view of terminal seg- 



ments. The pallial plates are elevated, exposing the proximal part of 

 the rami. 



59. Same, antero-dorsal view of genitalia. Only the anterior edges of the 



pallia] plates are seen, these plates being elevated to expose the genital 

 cavity. 



60. Acrydium graniilatum Kirby. Antero-dorso-lateral view of terminal segments. 



gc, opening into the genital cavity; pal h, pallial hooks. 



61. Melanoplus bivittatus (Say). Median sagittal section through genitalia. 



Plate VII. 



(Grylloblattoidea) . 



62. Grylloblatta campodeiformis E. Walk. Dorsal view of terminal segments. 



63. Same, ventral view of terminal segments. 



64. Same, posterior view of end of abdomen, cxp, process borne by right coxite, 



and forming with cl and Im a copulatory clasping apparatus; es, eversible 

 sac, arising from left paramere lobe; at 10, arm of 10th tergum, with 

 terminal sucker-like disc. 



65. Same, ventro-posterior view. 



66. Same, half-grown nymph. Ventral view of terminal segments. 



67. Same, full-grown (?) nymph. Ventral view of terminal segments. 



68. Same, full-grown nymph. Posterior view of end of abdomen. 



