AQUATIC INSECTS IN NEW YORK STATE 273 
I have a number of specimens kindly communicated Ly Prof. 
V. L. Kellogg, of Stanford University) is very similar. In both 
these species the labial hinge reaches posteriorly between the 
bases of the middle legs. 
These two southwestern species are at least subgenerically 
distinct from our eastern species; but a study of the not very 
homogeneous palearctic species should precede any attempt at 
the division of the genus. 
LIBELLULA 
Of the nine species of this genus which I listed from New 
York State in Bulletin 47, the nymphs of four were unknown. 
I believe I have the nymphs of two of these, though neither has 
been bred, and I describe them below. 
Libellula axillena (supposition) 
A single nymph not fully grown, from Raleigh N. C., collected 
by Mr C.S. Brimley. 
Length 22mm, abdomen 14mm, hind femur 5mm; width of h<ad 
5mm, of abdomen 7.2mm. Very. similar to the nymph of 
L. auripennis; having sharp pointed dorsal hooks on 
abdominal segments 4-8 and five setae on the lateral lobe of the 
labium, it would be traced to that species by my key (loc. cit. 
p.532); but it differs in the following particulars. (1) The mental 
setae are 12-13 each side, the six to seven outermost larger and 
closer together than the others. (2) The lateral spines of the 
eighth and ninth abdominal segments are less distinctly incur- 
vate at tip and bear finer bristles on their external margin. (3) 
The lateral abdominal appendages (white with black margins) 
are but a third as long as the inferiors (they are one half as 
long in auripennis). There is also in this nymph a black 
band across the head between the eyes; there are subapical bands 
on the femora. 
Libellula cyanea 
I have received numerous specimens of this nymph from 
Newark and Cooch Del., sent by Prof. E. D. Sanderson, and 
from Raleigh N. C., sent by Mr C.S. Brimley. These nymphs all 
show (what I did not see in the cast skins I described) a sub- 
median, ventral double row of round, small, brown dots; there 
is a corresponding double dorsal row of plainer dots ending 
opposite the lateral appendages, and between the two lines of 
