78 
The nymph (supposition) measures 30 mm.; abdomen, 20 
mm.; hind femur, 5 mm.; width of head 5 mm., of abdomen 
5.5mm. Olivaceous, yellowish below and on sutures. 
Body slender, pointed posteriorly, moderately hairy on 
margins and on all appendages. 
Head compact, hind angles prominent, rounded, a pair of 
small black tubercles on hind margin between these angles and 
the median line. Antenne long, considerably exceeding the 
labrum. Eyes large, black; ocelli yellow. 
Labium moderate; mentum narrowed for its posterior two 
fifths; median lobe very shghtly curved, fringe of flat scales 
short, in the middle of it a single simple or bifid tooth or a 
double one, which is shorter than the scales; lateral lobes stout, 
suddenly narrowed and sharply incurved to form the prominent 
end hook, which bears usually a minute denticle on its inner 
side. Inside the end hook there are about eight obliquely 
truncate, short, quadrangular, posteriorly directed teeth. 
Hook long, strong, arcuate. 
Legs short; tibial hooks of fore and middle legs well de- 
veloped. 
Abdomen somewhat depressed, attenuate posteriorly and 
upcurved, widest on segment 4; segments 3 to 7 and 10 all sub- 
equal in length, 8 a little longer, 9 one half longer than the 
others, margins of 9 yellowish. No dorsal hooks, or on 9 the 
merest rudiment; lateral spines on 7-9 short, appressed, minute 
on 7 and 8, on 9 only about one eighth the length of 10. In- 
ferior appendages about as long as segment 10; superior a very 
little shorter, its basal half thickened; laterals a little shorter 
than superior and much more sharply pointed 
A young nymph one fourth grown differs from the mature 
ones only in size and in having but 6 or 7 teeth on the lateral 
lobe of the labium. 
12. Gomphus villosipes Selys. 
This elusive gomphid was bred by Mr. Needham in large 
numbers at Ithaca, N. Y., in May, 1897. The imago has never 
been taken in Illinois, but there is a well-marked nymph of 
