64 
Legs somewhat hairy; tibial hooks on the anterior and 
middle pairs well developed. Wing-cases reaching the middle 
of the 4th abdominal segment. 
Abdomen ovate, widest across the 7th segment and nar- 
rowed rather suddenly upon the 9th. No dorsal hooks at all, 
but a faint impressed median line on the anterior segments; 
lateral spines on 8 and 9 small, angular; 9th abdominal seg- 
ment longer than the 8th and three times as long as the 10th. 
Appendages longer than the 10th segment, stout pyramidal, 
laterals one half to one third shorter than the others. 
VII. Dromocomrnus Selys. 
One of the three species of this American genus has been 
found in Illinois. The nymph may be known by the median 
ridge on the 9th abdominal segment, ending behind in a sharp 
spine. The imagos resemble those of Gomphus. 
Dromogomphus spinosus Selys. 
Gomphus sp., Hagen, ’85, p. 265, No. 19 (nymph). 
This appears to be quite rare in Illinois, and we do not 
know that any one has ever taken the nymph within our boun- 
daries. Walsh records the imago from the Des Plaines River, 
near Chicago; and Mr. Adams, from Kankakee, July 6. It has 
been taken in a number of states between Maine and Florida 
on the east and Texas and Illinois on the west. Kellicott 
found it common in Michigan July 15 to August 1, and gives 
the following interesting notes: ‘‘The female was several times 
found ovipositing in a manner similar to Macromia illinoiensis, 
that is, by skimming the water and every few feet or rods 
touching the water with the abdominal tip, scarcely checking 
her speed; at other times I have seen them drop down from 
an overhanging tree and repeatedly tap the water, remaining 
in one place after the manner of Libellula. Pairs were noticed 
to fly up into tree-tops, and remain in union for a considerable 
time.” The earliest date is June 5, given by Wilhamson. 
Miss Wadsworth observed an individual devouring a Calopteryx 
maculata. 
