938 a NEW YORK STATE MUSEUM 
In habits our species are somewhat diverse. In general, it 
may be said that they frequent the borders of the larger bodies 
and streams of water, and both in the water and out of it after 
transformation they cling to the surfaces of stones, piers, tim- 
bers, bare banks, etc., rather than to vegetation. Imagos may 
be found squatting on a bare bank much more frequently than 
clinging to its neighboring plants, but they will travel out among 
the plants when foraging, following then by preference a bare 
path or roadway. 
The eggs are deposited mostly on the alga-covered surfaces to 
which the nymphs will afterward cling. In ovipositing the male 
usually retains his hold on the prothorax of the female, and 
7 a A HS De 
sé Rae TTT a i es 
Fig. 8 Fore wing of Argia fumipennis, with quadrangle (gq) of hind wing 
when, as happens frequently with the first species of our list 
at least, she descends beneath the surface of the water to place 
her eggs at a lower level, he is carried along. 
The nymphs of Argia are usually recognizable at a glance, by 
reason of their thick set bodies and short, broad and dark col- 
ored gills. If these be not sufficient, the entire absence of rap- 
torial setae from the mentum of the labium will certainly dis- 
tinguish them from all our other genera of Agrioninae. The 
nymphs are so much alike that a generic description of them 
may be given here, saving much repetition. 
Nymph. Short and thick and usually dark colored, with short 
legs and short-oblong gill plates [pl.15,a]. The head is some- 
what wider than long, flat above, with very prominent eyes, 
behind which the sides are parallel as far as the obtusely 
rounded hind angles, between which is a deep round posterior 
emargination. The antennae are six to seven jointed, with 
the third joint longest. The labium [pl.14, e and f] is short, — 
with hinge barely reaching posteriorly to the base of the 
ese ae 
