59 
ora. Yellow also on ocelli, in a broad band between the eyes 
behind the suture, another band on the mid-dorsal line of the 
prothorax, and sometimes still other bands across the apical half 
of abdominal segments 7 and 8; also variable spots arranged 
along the sides of the abdomen. Abdominal appendages yel- 
low, brownish on the margins. 
Body but little hairy. Lateral spines on abdominal seg- 
ments 7-9, all equal. Dorsal hooks on 2 to 9, on 2 slender, on 
3-9 subcultriform, on 9 low and directed posteriorly. Other- 
wise much like nymphs of the other species of Diastatomma. 
2. Diastatomma rupinsulensis Walsh. 
This species was first described from Rock Island, Ill. The 
only other instance known to me of its capture in this state 
was on June 29 at a point on the Mackinaw River known as 
Mackinaw Dells, where favorable conditions for the nymph 
exist. Kellicott says the imago was first taken in Ohio May 5, 
near Columbus, and was common from the middle of May to 
the middle of June, flying above the swiftest currents or rest- 
ing near rapids. It is recorded from Canada, and from a num- 
ber of the northern states from Maine to Illinois. The nymph 
is as yet unknown. 
3. Diastatomma carolus Needh. 
Ophiogomphus carolus Needh., '97. 
This species flies in May at Ithaca, N. Y., where Mr. Need- 
ham bred it by scores in 1897 and picked up hundreds of exuvie 
by the banks of streams. Nymphs taken in October emerged 
in March. In April they were abundant in the trash-filled 
eddies of the swiftest streams, and after their emergence the 
banks were in places fairly covered with exuviwe. Notwith- 
standing all these evidences of abundance, he was able to cap- 
ture but a single imago there, and saw but two at large, during 
a whole season of active collecting. It would be very inter- 
esting to know what the imagos do with themselves. 
