72 
5. Gomphus abbreviatus Hag. 
The nymph was collected and bred by Mr. Needham at 
Ithaca, N. Y., and is here described for the first time. It is not 
an Illinois species, and seems quite rare and limited in range, 
imagos being recorded only from Maine, Massachusetts, and 
(with doubt) Pennsylvania. The only date found recorded for 
the imago is June 10 (Harvey). 
The nymph measures 24 mm.; abdomen, 15 mm.; hind fe- 
mur, 5.0 mm.; width of head 5.5 mm., of abdomen 8 mm. 
Body very flat, very scantily hairy on the margins. An- 
tenn with the third segment flattened and widened toward 
the tip. Labium short; mentum narrowed in its basal fourth, 
beyond which the sides are parallel, median lobe a little con- 
vex and with a median marginal tooth in the midst of the 
fringing flattened hairs; lateral lobes regularly narrowed and 
incurved to a point which is a little longer than the teeth on 
the inner border; teeth about eight, quadrant-shaped, pointed 
at the lower apical angle, successively decreasing in size prox- 
imally. 
Abdomen flat oval. Conspicuous lateral spines on seg- 
ments 6 to 9, increasing in stoutness posteriorly, the last about 
as long as segment 10. Dorsal hooks represented by minute 
rudiments on 8 and 9; a smooth median line anteriorly to this. 
Appendages yellow, almost twice the length of the 10th seg- 
ment, the laterals a little shorter than the others, the superior 
a little bent upward at the extreme tip. 
6. Gomphus vastus Walsh. 
Walsh found this species emerging in company with no- 
tatus and fraternus “in considerable numbers” at Rock Island, 
on the Mississippi, and described the imago as a new species 
(62, p. 391). Riley (Hagen, ’85, p. 265) also reared it from the 
Mississippi River at Hannibal, Mo. (not “TIl.”). The nymph is 
in Dr. Kofoid’s private collection, taken in deep water in De- 
troit River. The imago is reported from Illinois, lowa, Indiana, 
Michigan, Ohio (common in July), Pennsylvania, and several 
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