Plate LXIV 

 Caudal Gills of Nymphs* and Wings of Adults 



Fig. 70. 



Fig. 71. 



Fig. 72. 



Fig. 73. 

 Fig. 74. 



Fig. 75. 



*One 



abdomen. 



Enidlagma caruncidatum, 



gills. 

 Enallagma cijatliigerum, 



gills. 

 Enallagma gemin a turn, 



gills. 

 Agrion aequabile, wings. 

 Hetaerina americana, 



Fig. 76. Enallagma liageni, gills. 

 Fig. 77. Enallagma exsulans, dark 



and light gills. 

 Fig. 77a. The same, abnormal gills. 

 Fig. 78. Hetaerina americana, 



male, wings. 

 Fig. 79. The same, nymphal skin. 

 Fig. 80. Enallagma (?) calverti, 



lateral gill. 

 Enallagma civile, gills. 



of the lateral gills removed in eases where the gills are attached to the 



