Plate LX 

 Nymphal and Adult Structures 



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

 thorax. 



Fig. 28. The same, adult, maxilla. 



Fig. 29. Hetaerina americana, adult, ventral aspect of pro- 

 thorax. 



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



Fig. 31. Plecoptera nymph, maxilla. 



Fig. 32. Ischnura 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. 



Pig. 35. Ischnura verticalis, adult, leg. 



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



Fig. 37. The same, adult, labium. 



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

 appendages. 



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



