AQUATIC INSECTS IN NEW YORK STATE . 203 
The results of our work in so far as made ready for publica- 
‘tion appear in the following pages. With the aid of Messrs 
Reed and Hankinson, I have studied the food of the 25 brook 
trout taken in Bone pond at Saranac Inn, as detailed in my first 
‘report [N. Y. State Mus. Bul. 47, p. 396], and now report on it. 
The food of these trout was almost wholly insects, and there 
was found such a preponderance of a single species of gnat larva 
(family Chironomidae, order Diptera) in the.food, as indicates 
that that species may prove of high economic importance in water 
culture. In another brief article I have brought together the 
descriptions of a few dipterous larvae of unusual types. Most 
interesting, perhaps, is the larva of Epiphragma fasci- 
pennis, a burrower in fallen willow and buttonbush stems, 
lying on the banks of temporary ponds; a larva of enforced 
amphibious habits, its residence sometimes submerged, some- 
times exposed; and it has a mode of respiration suited to 
either condition. My chief contribution to this bulletin is the 
description of the life histories and habits of the damsel flies 
(order Odonata, suborder Zygoptera). I have been able to des- 
cribe the nymphs of all our 10 genera and of 23 of our 42 known 
‘species, all these descriptions being new. 
Mr MacGillivray has prepared a table of families of coleop- 
terous larvae in general that will be of great assistance to stu- 
‘dents of this order. His careful study of the respiratory ap- 
paratus of the Donacia larva solves the old, troublesome prob- 
fem as to how that animal, dweller on the submerged roots of 
Water plants, gets its air. His study of Donacia is complete 
for all species of the world fauna now known as larvae, and a 
tonsiderable proportion of them are now described for the first 
time. 
Mr Johannsen introduces his study of the dipterous families, 
Blepharoceridae, Simuliidae, Dixidae, Culicidae and Chironom- 
‘dae, with a table of families of nematocerous diptera. His 
Aecount of the Simuliidae is a monograph of the species of the 
‘astern United States in all stages of their development. In 
‘he Dixidae he gives a key to our Species (imagos) and offers the 
irst life history written for an American species. His treat- 
h 
