63 
in several particulars, and is related to Hagenius by its anten- 
nal structure. It was found burrowing in sandy stream beds. 
Lanthus parvulus Selys. 
Gomphus parvulus Selys. 
Uropetala thoreyi ? Hag. (nymph). 
This dainty little gomphid is not yet known to be an [Ili- 
nois species. The imago has been found only from Nova Scotia 
to Pennsylvania, but Dr. Hagen (’85, p. 251) has described the 
nymph from specimens received from Kentucky October 20, 
doubtfully referring them to Tachopteryx thoreyi. Nymphs 
answering to his careful description were found sparingly by 
Mr. Needham in the sandy beds of streams about Ithaca, N. Y., 
where he collected and reared half a dozen. The nymph is 
notable for its small size and the flat subcircular form of the 
third antennal joint. Itis an active little burrower, and has 
the habit of feigning death when withdrawn from the water. 
For these reasons it is more difficult to detect than are other 
gomphids. Nymphs kept under nearly normal conditions trans- 
formed in May. The imagos were not seen by him at large. 
They have been taken in Maine by Miss Wadsworth June 19 
and 25. 
The nymph measures 21 mm.; abdomen, 12 mm.; hind 
femur, 3.5 mm.; width of head 4 mm., of abdomen 6 mm. 
Body moderately depressed, a little hairy on sides of thorax 
and on legs. 
Head compact, with obtuse hind angles between which the 
hind margin is concave. Antenne with the two basal joints 
short and thick, the third very flat, broadly oval, almost circu- 
lar, the fourth very rudimentary. 
Labium short; mentum with sides parallel except in the 
abruptly narrowed basal fourth; median lobe almost straight, 
with four blunt chitinous teeth and a fringe of long scales; 
lateral lobes short and stout, rounded off on the outer angle so 
that the inner border is not arcuate; teeth of the inner border 
prominent, acute, recurved, somewhat divergent ; movable hook 
short and stout. 
