4 Psyche [February 
Pool 4 was a temporary pool beside Fall Creek, about six feet 
in length and three feet or less in width. It was sheltered by an 
overhanging stump, but was in the bright sunlight nearly all day. 
Pools 3 and 1 were sunny also. The only alga in it was Mougeotia 
which was in vigorous fruiting condition. Embedded within it 
were many masses of Chironomid eggs, as well as many full-sized 
Chironomid larve within their filmy homes. Many very small 
larvee of A. punctipennis were at the surface of the water among 
the delicate filaments. A great many minnows were darting about 
below the algee, also small Coleoptera. There were no water- 
striders or whirligig beetles, or other surface feeders. After two 
weeks the Mougeotia had sunken to the bottom and the larve of 
A. punctipennis had disappeared, excepting a few large ones. 
Pool 5 was near 4 but in the deep shade, the larve being con- 
fined to a mat of Spirogyra. Here the water flowed slowly. Pool 
6 was near, but in sunlight all day, and the larve were concen- 
trated among the filaments of a mass of Mougeotia, and were to 
be found nowhere else in the pool. The water flowed quite rapidly 
by, but the Mougeotia was anchored. 
All the larvee found in the Mougeotia were exceptionally trans- 
parent, even in the older stages. Just after molting, they were 
almost as clear as glass, and were at all times the best ones to 
study. On the other hand, larve found in pool 7, a muddy dark 
pool in a very shady place, were always very dark and opaque. 
Here the larvee were found among the large floating leaves of a 
Polygonum, and nowhere else in the pool. 
Feeding Habits. A number of larve of all ages were put in a 
watch crystal with small masses of Zygnema and Mougeotia, all 
in fruiting condition. Cladophora was added also. A good deal 
of surface material was devoured by all the larve. The younger 
ones were more particular in the matter of particles, rejecting a 
good many. They moved around among the filaments, head 
bent downward, finding plenty to their liking on the Cladophora, 
as well as on the others. They merely brushed off the particles 
from the larger filaments. A larva of only 1.5 mm. was seen to 
swallow a filament of Zygnema, and to make an effort to swallow 
large ones of Spirogyra, of which it would merely chew the broken 
ends. Many small larvee were seen eating the delicate Mougeotia. 
When the food is merely surface particles the head is turned a 
