70 
to the early part of July. They were observed emerging 
numerously at Urbana on May 27. 
The nymph was described by Hagen (’85, p. 264) and con-. 
nected with this species by supposition. 
The nymph measures in length 32 mm.; abdomen, 21 mm.; 
hind femur, 6.5 mm.; width of abdomen 8 mm., of head 6 mm. 
Body depressed. Color yellowish brown with darker mark- 
ings on sides of thorax, on wing-cases, and on median dorsal 
area of abdomen. Lateral margins of body and appendages 
fringed with luteous hairs, except on tapering posterior end of 
abdomen. Scars prominent. 
Head compact, notched behind; hind angles broad. 
Labium stout, short, not extending posteriorly beyond the 
bases of the fore legs. Mentum flat, broad, slightly narrowed 
at base; median lobe very slightly rounded, margined with a 
dense comb of flat bristling hairs, lateral lobes arcuate, nar- 
rowed to an incurved tip within which are about nine teeth on 
the inner margin. Movable hook long, stout, incurved, and 
rather bluntly pointed. 
Abdomen widest across segment 6, acutely narrowed to the 
tip; segments 3 to 8 of about equal length, 9 one half longer 
than 8; 10 cylindric, less than half the length of 9; short lat- 
eral spines on 6 to 9, increasing in length posteriorly, those of 
9 reaching slightly beyond the middle of 10; small dorsal hooks 
on segments 3 to 9, best developed on 4 to 6. Superior and 
inferior abdominal appendages longer than segment 10; laterals 
shorter than the others. 
Younger nymphs lacking two or three molts of maturity 
do not differ in any essential character. A quite young nymph, 
8 mm. long, has dorsal hooks on 8 and 9, well marked only on 
9, with merest rudiments on the middle abdominal segments. 
The four pairs of lateral spines are all present. 
3. Gomphus descriptus Banks. 
G. descriptus Banks, ’96. 
This was recently described from specimens taken in New 
York May 15-21. Williamson’s statement that it occurs in 
