HOW TO KNOW THE IMMATURE INSECTS 



ORDER ODONATA 



la. Abdomen stout, usually wider than 

 head, with 3 short, triangular or spine- 

 like appendages at tip (Suborder Ani- 

 soptera, dragonflies). Fig. 144 3 



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Fig. 144. Dorsal aspect of 

 obdominol segments of o 

 dragonfly naiad. 



lb. Abdomen slender, usually narrower than head, 

 with 3 long, leaf-like tracheal gills at tip (Sub- 

 order Zygoptera, damselilies). Fig. 1^5 2 



It will be noted that both the imature stages and 

 the adults of the damselflies can be separated at 

 sight from those of the dragonflies. One does not 

 always find distinguishing characters so obvious. 





Fig. 145. Dorsal as- 

 pect of abdominal 

 segments of a dam- 

 selfly naiad. 



2a. 1st antennal segment shorter than the remaining segments to- 

 gether; lateral gills 2-sided. 

 Fig. 146 Family COENAGRIONIDAE 



The naiads of this large and prolific family ore 

 very abundant. A large percentage of these deli- 

 cate creatures are eaten by fish and other aquatic 

 associates, but large numbers escape to become 

 adults. 



Fig. 146. a, Isch- 

 nura sp.; b, a lat- 

 eral caudal gill. 



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