28 THE IMMATURE STATE OF THE ODONATA. 
GOMPHZi5CHNA. 
Body long, slender. Eyes rather small. Abdomen with lateral spines 
on segments five to nine. Appendages as long as segments nine and ten. 
Inferiors sharp, bent inward at tip ; middle one a little shorter, sharp, bifid at 
tip; laterals very short. 
21. GOMPHASCHNA FURCILLATA. 
PuateE II. Fie. 4. 
Say. Hagen, Synopsis N. Amer. Neur. p. 131. 
Two nymphe, in alcohol, young. Length, 26mm.; breadth, 7mm. 
(figured). Locality, Berkshire, Tioga County, N. Y. Three male and fe- 
male, length, 32 mm., Brookline, Mass. Two young, Cambridge, Mass. 
Head large, very broad; length less than half the breadth, much nar- 
rower behind. Eyes very prominent, placed at forward angles, separated 
from occiput by very curved line; space between the eyes wide, convex. 
Posterior portion formed of three orbicular elevations, showing the indica- 
tions of ocelli more distinctly than in the other species. Antenne small, 
third joint somewhat longer than fourth. Occiput short, rough, with yel- 
lowish scales, sides oblique: hind angles somewhat more than a right angle, 
with parallel polished bands; elliptical polished spot on each side of median 
line; hind border not very deeply notched. Mask extending to between 
middle legs gradually enlarged forward. Middle third of front border rather 
strongly produced ; cleft and with a well defined tooth on each side of cleft. 
Palpus meeting the opposite one, straight on tip, somewhat arcuated ; inner 
border rounded and finely denticulated; end hook small; movable hook 
bent, reaching base of opposite one. Prothorax narrow, as broad as occiput, 
somewhat bent up at sides. Processes conical, sharp, enclosing rather less 
than right angle; posterior somewhat shortest and not so sharp. Legs 
rather strong, arcuated; hind legs reaching segment eight. Femora and 
tibix ringed twice with darker color. Wing cases reaching somewhat be- 
yond second segment. Abdomen stout in proportion; lateral spines on seg- 
ments five to nine, strong; that on ninth nearly as long as tenth segment; 
tenth segment as long as ninth. Appendages stout, sharp, hairy, as long as 
two last segments. Inferiors pyramidal, sharp, and somewhat curved inward; 
middle one nearly as long as inferiors, and split at tip; lateral superiors only 
one fourth as long as middle one, conical. Male projection conical, as long as 
