65 
The nymph has been bred by Calvert, and imagos, nymphs, 
and exuview were collected by Mr. Needham—all three at the 
same time and place—near Ithaca, N. Y.,in June. Hagen’s 
nymph No. 19, from Michigan, is probably this species. 
The nymph measures 34 mm.; abdomen, 22 mm.; width of 
head 5.5 mm., of abdomen 7 mm. 
Body elongate, nearly smooth. Antenne a little more 
approximated than in related genera, the 8d segment more 
upeurved at the tip. Labium moderate, mentum slightly 
widened all the way to its apex; median lobe a little coneave, 
with minute median tooth and a sparse fringe of flat hairs 
either side of the tooth; lateral lobes short and stout, the 
apex incurved in a stout hook which considerably exceeds the 
8 truncate teeth of the inner margin. Tibial burrowing hooks 
strong. 
Abdomen cylindric, becoming sharply triquetral in cross- 
section posteriorly. Dorsal hooks on segments 2 to 9, on 2 
rudimentary, but becoming well developed posteriorly, and on 9 
straight, almost equaling the lateral spines and confluent ante- 
riorly with the sharp mid-dorsal ridge. Lateral spines on seg- 
ments 6 to 9 increasing in size posteriorly. Appendages a little 
longer than the 10th segment, their apices bent a little so as 
to be divergent; laterals a little shorter than the others. 
VIII. Gompxuus Leach. 
The nymphs of this large and difficult genus represent the 
typical and most abundant form of the family. The wing-pads 
are not divergent, as in Progomphus, Herpetogomphus, and Dias- 
tatomma, nor the third antennal joint subcircular, as in Hage- 
nius and Lanthus; nor are the abdominal segments armed 
with spinose dorsal hooks, as in Dromogomphus. Their habits 
are very similar to those of the rest of the family, with the 
exception of Hagenius, as described fully under the family 
heading. Observations by Mr. Needham at Ithaca and by Mr. 
Hart at Havana indicate a nymphal life of more than one 
