l'l,ATE LIX 



Xjmplial Structures 



Fif,'. 14. l^cstcs rccldnguhiris, wing-easc. 



Fit?. 15. Hctdcrina (imcricdna, wing-easc. 



Fig. 16. EiuiUuyma siynutum, wing-case. 



Fig. 17. The same, young nymph, wing-case. 



Fig. 18. hclinurii vrrticdlis, caudal end of the abdomen 

 with the two lateral gills removed. 



Fig. 19. EnutUignui (xsulnm, tarsus. 



Fig. 20. The same. leg. 



Fig. 21. Isclinura lurtirulis. dorsum of meso- and 

 mctathorax. 



Fig. 22. Agrirni niiiruIntunK maxilla. 



Fig. 23. Hctnerina (imcricuna, dorsum of the prothorax. 



Fig. 24. Isclinura verticalis, ventral aspect of thorax 

 and cephalic segments of abdomen. 



Fig. 25. The same, lateral aspect of thoi-ax and ab- 

 domen. 



Fig. 26. Emilhiymd sp., cross-section of gills. 



