188 * NEW YORK STATE MUSEUM 
averaging perhaps two thirds grown) were thrown into the 
tank twice daily in sufficient numbers so that each day a few 
remained over, uneaten. They were simply thrown on the 
bottom where they were snapped up promptly so long as the 
fish were hungry. The number disposed of during the preceding 
interval was: recorded at each feeding. The average number 
eaten by the half grown Chrosomus was 11 per day, by the full 
grown ones, 25 larvae per day. The largest number was dis- 
posed of at the first feeding, but the figures were maintained 
fairly uniform after the third day; evidently these larvae are 
choice food for Chrosomus. The experiment was abandoned 
after 22 days because of the great difficulty found in supplying 
sufficient Chironomus larvae. 
That the adult midges are quite as attractive food for Chroso- 
mus as are the larvae is indicated by the following field observa- 
tions made by Mr Ferguson: | 
It is very interesting to watch the fish feeding. The midges 
hovering over the water seem to attract them most. Usually the 
minnows are satisfied to wait till the midges touch the surface of 
the water, but quite often they spring several inches out of the 
water to catch them. 
NEW DATA CONCERNING MAY FLIES AND DRAGON FLIES 
OF NEW YORK 
May flies 
(Ephemeridae) 
Under this heading will be included a brief account of the May 
fly fauna of Old Forge, and descriptions of a few new forms col- 
lected by Dr C. Betten at Buffalo and vicinity in the summer of 
1906. At Old Forge, May flies were abundant, and no place in 
which I have ever collected better exemplifies the need of different 
methods, and of collecting from different types of situation, and 
at different hours of the day, if one would really know the May 
fly fauna. There was a very familiar group of species (Siphlurus, 
Epheremella, Heptagenia etc.) that settled upon the outside of the 
hatchery and that could be found anywhere about the banks of 
Old Forge pond where shelter and good resting places offered. 
Then there were some others (Caenis, Chloeon) that were only to 
be found at night at the time of their emergence from the water. 
A few, like Leptophlebia, Chloroterpes and Baetis could be found 
on still afternoons swarming in great companies in the hollows of 
the wood, especially over little pools or in their vicinity, and there 
