Plate LX 

 Nymphal and Adult Structures 



Fig. 27. Isclinura verticalis, adult, ventral aspect of pro- 

 thorax. 



Fig. 28. The same, adult, maxilla. 



Fig. 29. Hetaerma americuna, adult, ventral aspect of pro- 

 thorax. 



Fig. 30. Isclinura verticalis, adult, caudal aspect of head. 



Fig. 31. Plecoptera nymph, maxilla. 



Fig. 32. Isclinura verticalis, adult, cephalic aspect of head. 



Fig. 33. Hetaerina americana, adult, ventral view of the 

 second abdominal segment of the male. 



Fig. 34. The same, adult, anal appendages, dorsal view. 



Fig. 35. Isclinura verficalis, adult, leg. 



Fig. 36. The same, adult, lateral view of prothorax. 



Fig. 37. The same, adult, lal)ium. 



Fig. 38. Hetaerina americana, adult, lateral view of anal 

 appendages. 



Fig. 39. The same, adult, lateral view of prothorax. 



