HOW TO KNOW THE IMMATURE INSECTS 



2b. 1st antennal segment as long as the remaining segments togeth- 

 er; lateral gills 3-sided. Fig. 147 Family AGRIONIDAE 



This family of broadwinged damselflies is much 

 smaller than the proceeding one. The naiads are 

 larger and sturdier. 



Tig. 147. a, Agrion 

 sp.; b, a lateral 

 caudal gill. 



3a. Labium spoon-like. Fig. 148 Family LIBELLULIDAE 



This is the large family of dragonflies in 

 point both of abundance and numbers of 

 species. The immature forms may be found 

 among the debris of almost any shallow 

 body of water. 



Fig. 148. a. Libellulo 

 luctuosa Burmeistet; b, 

 Lateral aspect of head; 

 c, labium. 



3b. Labium not spoon-like. Fig. 149 Family AESCHNIDAE 



The members of this family average larger 

 than those of the preceeding family, though 

 there are much fewer individuals and species. 

 Their naiads while not as abundant may be 

 collected rather readily. 



Fig. 149. a, Aeschno sp.; 

 b. Lateral aspect of 

 head. 



68 



