54 
or contiguous, except sometimes in exuvie; sides of 
10 subparallel, largely embraced by the lateral spines 
of the rapidly narrowing 9th segment. 
cc. Third antennal joint flat, subcircular or broad oval, 
less than twice as long as broad. 
dd. Body very broad, 3d antennal joint subcireular, 
abdomen much flattened and subcircular, with 
distinct dorsal hooks; middle legs more distant 
at base than fore legs; lateral labial lobes ob- 
scurely denticulate, with broadly rounded apices. 
V. Hagenius. 
d. Body of the usual form, 8d antennal joint broad 
oval, dorsal hooks entirely wanting; middle and 
fore legs about equally distant; lateral labial 
lobes dentate, with blunt apices. VI. Lanthus. 
c. Third antennal joint subcylindric, more than twice 
as long as thick; middle and fore legs about equally 
distant; lateral labial lobes toothed. 
ee. Dorsal hooks with short but acute spiny tips; 
median labial lobe shightly concave; lateral lobes 
with prominent apical hook. 
VII. Dromogomphus. 
e. Dorsal hooks sometimes present, but obtusely 
pointed, usually absent except for a median tooth 
in the hind margin of 9; median labial lobe more 
or less convex, in some species nearly straight; 
lateral lobes with a more or less evident apical 
hook. VIL. Gomphus. 
I. Apuyta Selys. 
Aphylla producta Selys. 
Two curious nymphs from Florida are described by Hagen 
as probably belonging to this tropical species, common in 
Cuba. The unusual length of the last segment will at once 
identify it. 
