86 
The imagos are reported from Illinois, Texas, Michigan, 
Ohio, Tennessee, and the Atlantic coast states from New Jersey 
to Florida, the dates of collection ranging from May 25 to 
September 30. The period of flight usually ends about August 
1, but a single example was taken as late as August 25 at 
Havana. In Illinois adults have also been listed from Bloom- 
ington, Moline, and from Winchester, in Scott county. 
The nymph measures in length 35-86 mm.; abdomen, 25 
mm.; hind femur, 4.5 mm.; width of abdomen 6-7 mm., of 
head 5 mm. 
Body narrow and elongate, a little hairy on lateral margins 
and appendages. Head cordate, arcuately notched behind, with 
broadly rounded but prominent hind angles. External tibial 
hooks minute. 
Labium elongate, mentum one half longer than broad, 
widened apically; median lobe slightly rounded in front, its 
comb of scales short and sparse; lateral lobes arcuate and ter- 
minating in a sharply incurved hook. Teeth on inner margin 
varying from none at all to four or five, increasing in size and 
distinctness proximally. Movable hook long, strong, and regu- 
larly incurved. 
Abdomen widest on 6, median dorsal smooth line on seg- 
ments 2 to 7 or 2 to 8; a flattened rudiment of a dorsal hook 
on 9; segments 3 to 8 of about equal length, 9 one third longer, 
10 very short; lateral spines on 6 to 9 appressed, those on 9 half 
as long as the inferior appendages; appendages about equal 
and exceeding the length of 10. 
20. Gomphus notatus Selys. 
G. fluvialis Walsh (in part). 
The true notatus is represented in our Illinois collections by 
only a single female, taken on the bank of the Mississippi near 
Savanna August 1. In its wing venation and external sexual 
structures it seems quite distinct from plagiatus. The nymphs 
described by Hagen as notatus and plagiatus are probably all 
plagiatus. His description of notatus agrees exactly with un- 
