COENAGRIONIADE 267 
Family CoENAGRIONIDAE 
These are narrow winged damselflies. The wings are stalked at the 
base, the anal vein for a distance forming the hind border. The quad- 
rangle is trapezoidal, its anterior side shortened, its outer hind angle 
pointed, and it is not divided by across vein. There are but two ante- 
nodal cross veins and there is generally a well developed brace vein 
to the stigma. 
The nymphs are slender creatures with bodies that taper to the three 
thin plate-like caudal gills. The basal segment of the antenna is not 
longer than some of the succeeding segments. The labium is entire; 
or if cleft, the cleft is short and closed. It is armed with raptorial setae. 
They are climbers on submerged vegetation and are among the com- 
monest inhabitants of all still waters. 
In our fauna we recognize two subfamilies, separable as follows: 
KEY TO THE SUBFAMILIES 
Adults 
1 Vein M3; rises nearer the arculus than the nodus; between veins 
M; and adjacent principal veins there are short intercalary 
sectors running to the wing margin.......... Lestinae, p. 268 
Vein M3 rises nearer the nodus than the arculus; no such inter- 
calary longitudinal veins present...... Coenagrioninae, p. 280 
Nymphs 
1 Gills multiarticulate, parallel sided; labium with a median closed 
GIST oss. 2G SW a 10 | ohh ie Sanne neta Om Lestinae, p. 268 
Gills simple with aig margins; middle lobe of labium entire. 
Betas Aaue a At ot ce Onn), Bie a es NS Coenagrioninae, p. 282 
