Fig. 29. — Hexapoda-Plecoptera : external genitalia. 



A, Acroncuria arida, male, end of abdomen, dorsal view. B, same, ventral 

 view. C, Acroncuria^ female, end of abdomen, ventral view. D, Acroncuria 

 arida, male, end of abdomen, lateral view. E, Acron-curia evohita, end of abdomen 

 with protracted penis (from Clark, 1934). F, Neophasganophora capitata, end 

 of abdomen, dorsal view (from Frison, 1935). G, Nemoura bifurcata, end of 

 abdomen, dorsal view. H, same, supra-anal process, lateral view. I, same, 

 end of abdomen, ventral view. J, Pteronarcys proteus, end of abdomen, lateral 

 view. K, Taeniopteryx nmura, end of abdomen, lateral view. L, Leuctra sibleyi, 

 end of abdomen, lateral view. M, same, ninth and tenth abdominal segments, 

 ventral view. 



a, tergal process of eighth abdominal segment ; b, tergal process of ninth seg- 

 ment ; c, percussion disc of ninth sternum ; Cer, cercus ; d, basal lobe of ninth 

 sternum ; c, lateral process of tenth segment ; Eppt, epiproct ; /, g, lateral and 

 median ventral processes of tenth sternum; Gtr, gonotreme (opening of genital 

 chamber); /;, dorsal process of paraproct ; i, median process of epiproct; IX, 

 ninth abdominal segment; Papt, paraproct; Pen, penis (protracted phallic 

 organs) ; Phi, ectophallus ; S, sternum; T, tergum; X, tenth abdominal segment; 

 X.V, membranous venter of tenth segment. 



86 



