AQUATIC INSECTS IN NEW YORK STATE 226 
This is the common and perhaps the only species in New York 
State. The above account of the habits of the genus has been 
written with this species in mind. It is as yet recorded from 
but three localities in the State, but it will doubtless be found 
in many other places when proper search is made for it. Its 
nymph has not been described, but in 1880 Dr Hagen drew char- 
acters distinctive of the genus from nymphs which he referred to 
H.californica, H.americana,H.titia and an 
undetermined species from Brazil, and Calvert? and Williamson® 
have used these characters in keys to American nymphs. 
Nymph. Length of body 17mm; antennae 4mm additional; 
gills 7mm additional. Color greenish or brownish, paler on the 
sutures, on legs and on margins of gill 
plates, but without distinct color pattern. 
Occasional specimens show faint indica- 
tions of darker transverse bands on the 
tibiae and gill plates. 
Head flat above, with rounded eyes set 
well forward, with hind angles obtuse and 
having a much less distinct superior tooth 
_ than that of Calopteryx. Antennae long, 
inserted into large frontal prominences, 
somewhat shorter than the head is wide, 
the first segment longer than the following 
six, which rapidly and successively decrease 
in length and thickness. Labium long, the 
hinge extending posteriorly between the 
bases of the middle legs; mentum suddenly 
and greatly dilated in its apical half, its 
eam lobe divided into two lobes by a. yy, 4 antenna, and end of 
median cleft, which is rounded basally and sbdomen shoting tore 
Paremaes barely below the level of the bases 2ymph, of Hetaerina 
_ of the lateral lobes of the labium; the distal 
end of the cleft is closed by the apposition of the two divisions 
of the median lobe; beside the cleft on either side is a single 
small spinule. Each lateral lobe of the labium is straight on 
its outer margin, with a moderately strong and arcuate movable 
hook, just before the base of which on the superior margin are 
three small spinules. The exposed portion of the inner margin 
is strongly convex, and finely serrulate, and terminates after a 
Sigmoid curve, in a short, stout, strongly arcuate end hook; 
ed 
1Hnt. Soc. Belgique, Compte Rendu, 23:65. 
2Am, Ent. Soc, Trans. 20:225. 
3 Dragon Flies of Indiana, p.247. 
