79 
this species in the State Laboratory collection from Swan 
Pond, near the Wabash River in southeastern Illinois. The 
nymphs were exceedingly abundant at Ithaca. Two distinct 
sizes were observed, a fact which, taken in connection with 
the extremely short period of emergence, strongly indicates 
that the species takes two years to complete its life cycle, 
the nymph hatching in one season not transforming until 
the second season thereafter. Two males were all the imagos 
seen at large, yet exuvie in countless numbers lined the banks 
of all streams. The perching habits of these two males were 
about as described further on for G. pallidus. The imago has 
been taken as far west as Michigan and Ohio. It flies in early 
summer, the recorded period being May 30 to June 26. 
Kellicott says of villosipes, exilis, and furcifer that they 
“frequent quiet waters of smaller ponds, or even ditches where 
there are floating alge or lily-pads on which to rest. The 
males explore the borders and watch from the muddy shore or 
floating plants; the females at intervals drop down from their 
coverts to oviposit among the plants, dipping into the water in 
a manner similar to that of Libellula.” 
The nymph measures 37 mm.; abdomen, 24 mm.; hind 
femur, 6 mm.; width of head, 5.5 mm., of abdomen 8 mm. 
Form identical with that of G. pallidus. Lateral margins 
of apical segments of abdomen marked rather showily with 
yellowish, especially beneath. Labium as in G. pallidus, but 
with the fringe of hairs bordering the median lobe shorter, the 
lateral lobe arcuately incurved at the apex, its extreme point 
shorter than the first of the six stout posteriorly-directed teeth 
upon the inner margin. Lateral spines well developed only on 
the 9th segment. Dorsal hooks almost entirely wanting, even 
on the 9th segment. Appendages shorter than the 10th seg- 
ment, the laterals a little shorter than the others. 
13. Gomphus pallidus Ramb. 
Mr. Needham studied this species at Purington Lake, near 
Galesburg, where it was found in company with G. graslinellus. 
