Illinois is based on an erroneous determination. The only 
nymphs of this species known to us were found by Mr. Needham 
in New York. Itabounds in all the streams about Ithaca, trans- 
forms in May by thousands, and scatters to the woods. Many 
imagos were seen by him foraging about the borders of upland 
woods and going to rest at night among the branches of trees, 
but he did not observe their breeding habits. 
Transformation takes place generally before daylight and 
within a few inches, or at most a few feet, of the water’s edge. 
The nymph measures 29 mm.; abdomen, 18 mm.; hind 
femur, 7 mm.; width of head 5.5 mm.. of abdomen 8 mm. Body 
very flat and hairy; legs and antenne and lateral margins of 
head very hairy. Head depressed and wedge shaped. 
Labium short; mentum squarish beyond the narrowed 
basal third; median lobe nearly straight; lateral lobes very 
arcuate, ending in a distinct hook on the inside of which is a 
very broadly pyramidal tooth; proximally the lateral lobe bears 
on its inner side a series of 7 to 9 short, broad, slightly recurved 
teeth; movable hook long and strong. 
Abdomen lancet shaped; scars above and ganglion pockets 
beneath very plainly marked; segments 2 to 8 about equal in 
length, 9 one half longer, 10 half as long as 9; dorsal hooks 
reduced to broad median swellings on segments 2-9, not hooked 
nor pointed; lateral spines on 6 to 9, those of 9 about one half 
as long as 10. Superior and inferior appendages one third 
longer than 10, laterals a little shorter. 
4. Gomphus quadricolor Walsh. 
This imago is seldom captured in Illinois. The nymph is 
unknown. Walsh’s examples were taken at Rock Island. Mr. 
Adams took the imago at Bloomington June 23. Kellicott 
made three captures in Ohio, May 20 to June 15; Wilhamson 
found one June 26; and it is also on record from Indiana, Michi- 
gan, and Massachusetts. It rests, according to Kellicott, on 
rocks projecting from rapids, or on the banks near by the 
most rapid parts of large streams. 
