78 



The nymph (supposition) measures 30 mm.; abdomen, 20 

 mm.; hind femur, 5 mm.; width of head 5 mm., of abdomen 

 5.5 mm. 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. Antenuce long, considerably exceeding the 

 labrum. Eyes large, black; ocelli yellow. 



Labium moderate; mentum narrowed for its posterior two 

 fifths; median lobe very slightly 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 



