46 
6. Aschna verticalis Hag. 
A schna juncea verticalis, Calvert. 
This species ranges from Nova Scotia to the District of 
Columbia, and has also been taken in Ohio, Illinois, and Cali- 
fornia. At the East it is commoner than clepsydra, but not in 
Illinois, having been taken only at Rock Island. The published 
dates range from July 16 to October 18. Harvey found it com- 
mon over meadows, bogs, and rivers in Maine. The nymph 
has not been described or bred. We have in the Laboratory 
collections, however, two lots of young specimens taken from 
the marshy shore of Grass Lake, I1l., which are clearly distinct 
from the others here treated, especially in the form of the lat- 
eral labial lobes, and which may be reasonably assigned to the 
above species. 
VI. Anax Leach. 
The abundant and very uniformly distributed nymphs of 
this genus may be separated from any of the others of this 
family—which are usually much less common—by the fact 
that they have only three pairs of lateral spines. In habit 
they are quite unlike the lower zschnid genera, as they thrive 
especially—even in small temporary pools and ditches—wher- 
ever there is a luxuriant aquatic vegetation, through which 
they clamber actively, preying on all sorts of water insects. 
The imagos are familar objects, large, bright green, the 
wings with yellowish costal margins, circling about in swarms 
or singly in search of small insects in the air. 
Anax junius Drury. 
King of the dragon-flies, powerful and fearless, our great 
Anax is a dominant type of its class; and its worthy offspring, 
omnipresent and omnivorous in the water world, is equaled 
only by the large water-tigers (Cybister) in strength, activity, 
and ferocity. It has none of the sluggish obscurity of Calop- 
teryx, Gomphus, Boyeria, or Epicordulia. Wt clings to water 
