63 



in several particulars, and is related to Hagenins by its anten- 

 nal structure. It was found burrowing in sandy stream beds. 



Lanfhus parvulus Selys. 



Gomphus parvulus Selys. 

 Uropetalathoreyi ? Hag. (nymph). 



This dainty little gomphid is not yet known to be an Illi- 

 nois species. The imago has been found only from Nova Scotia 

 to Pennsylvania, but Dr. Hagen ('85, p. 281) has described the 

 nymph from specimens received from Kentucky October 20> 

 doubtfully referring them to TacJtoptenjx tJwreyi. 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. It is 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 the habit of feigning death when withdrawn from the water.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. Antennae 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. 



