CONNECTICUT GEOL. AND NAT. HIST. SURVEY 



[Bull. 



classification. The ocelli are never present in the nymph and the 

 compound eyes not often contiguous. The antennae are also 

 different from the adult, especially in the families Gomphidae and 

 Agrionidae, where certain segments are greatly enlarged. 



Thorax. — The prothorax usually consists of a simple ring with 

 a pair of legs attached. An indistinct line on the mid-dorsum 

 divides the pronotum. The pleura are divided by a line running 



^ Labrum Ciypeus 



I appendage 



Fig. 6. Nymph of Anisopteron (Basia^schna Janata) showing parts. 



dorsad from the coxal processes. The legs are not usually pro- 

 vided with heavy setae as in the adult, but the tibiae sometimes 

 possess small scales at the tip. Meso- and metathorax are essen- 

 tially the same as the adult in form, though sutures are not usually 

 as distinct and the wings are, of course, undeveloped. All signs 

 of wings are wanting in the first instars. 



Abdomen. — The lateral margins of the abdomen are produced 

 in the form of keels and variously adorned with spines and setae. 



