SUBORDER ZYGOPTERA 
Damselflies 
Insects of slender stature. Head transversely elongated. Eyes wide 
apart, separated on the top of the head by more than their own 
horizontal diameter, and directed laterally. Fore and hind wings 
similar in form, folded vertically above the back when at rest (held 
obliquely upward in Lestes). Wing with a simple quadrangle instead 
of triangle and supra-triangle, and the vein Cu not sharply bent 
between the arculus and its fork. Middle lobe of labium deeply cleft. 
Male with four terminal abdominal appendages, there being a pair of 
inferiors. Female with a well developed ovipositor. 
The nymphs have three caudal gills that are more or less plate like, 
appended to the end of the abdomen, and the slender body tapers 
from the head backward. 
KEY TO THE FAMILIES 
Adults 
1 Antenodal cross veins numerous; wings not stalked............ 
aA chatepesld Sepa he ach kiya, = REESE CRs, Lo ARERR ls 40 oad Ss Agrionidae, p. 258 
Antenodal cross veins two; wings stalked. Coenagrionidae, p. 267 
Nymphs 
1 Basal joint of antenna very long; labium with a deep and wide 
median: :Gletty <2 1 enn, eto ee Agrionidae, p. 258 
Basal joint of antenna short; labium entire, or nearly so........ 
Shah cha tal Sai Guts BAe BO eet ce NNT Or east oie Coenagrionidae, p. 267 
257 
