iA NEW YORK STATE MUSEUM 
dots on the dorsal side is a double row of broader, obscurer 
brownish marks close beside the middle pale line. The number 
of lateral setae appears to be somewhat variable: while six is © 
the normal number, seven occur sometimes; but the species is in 
such cases distinguishable from basalis by the brown mark- 
ings just described. 
Libellula plumbea (supposition) 
I have a single specimen of this species, received from Mr 
‘C. S. Brimley of Raleigh N. C. It is very similar to the nymph é 
of L. cyanea, but is at once distinguished by the psss-ssion 
of eight lateral setae on the labium. 
Length 17mm, abdomen 10mm, hind femur 5mm; width of head 
5mm, of abdomen 7mm (not fully grown). Head with an anvil- 
shaped black mark on either side of the median ocellus; a pale 
median line extends from the median suture of the head to the 
base of the abdomen; segments 2-8 of abdomen each with a pair 
of large, oblique, brown spots on the sides, becoming diffuse on 7 
and 8 and the apical portion of each becoming detached as a 
darker, small, round dot; there is also an outer row of dots 
blacker on segments 4-9; femora and tibiae faintly twice banded. 
There are four lines of pubescence each side down the back of — 
the head. 
Lateral setae of labium 8, mentals 12-13, each side of 
which the outer seven are in a larger series. Dorsal hooks of 
abdomen on segments 4-8, spinelike on 6-8, and straight on the 
superior margin differing in this from nymphs of basalis, 
in which the apexes are declined and the upper margin arcuate). 
The superior appendage is longer and more contracted in the 
middle and more attenuate to the apex than in basalis. 
I conclude my part of this appendix with a tabular statement 
of the general features of the habitat of such New York species 
as I have had good opportunity for observing in the field. Further 
observation will probably discover that some of these have a 
wider range of habitat; but I trust that this table contains 
hints that will be of use to the amateur collector. My record 
for brackish water species is based on a small collection from 
Sable island sent me by Dr James Fletcher. There is no fresh 
water there; and the material sent included cast nymphal skins 
of the two species listed here, taken on the spot. 
