Q Psyche [February 
for at least fifteen years. Whereas, down on the flats at the head 
of Cayuga Lake, and where A. maculipennis is common, there is 
more or less malaria all the time. Forest Home does not pro- 
duce A. maculipennis at all, while A. punctipennis is there in 
comparatively great numbers. This is not unlike the situation 
at Baltimore where in 1902 Hirshberg and Dohme reported that 
“4. punctipennis breeds in the higher sections, while A. maculi- 
pennis is to be found in lower localities.” 
Local Occurrence. On October 21 a great many iull-grown larve, 
also many pupz, were found in pool 1, which is a drinking place 
for cattle, fed by a spring, and never dry. It was covered with 
Lemna, although not densely. A few masses of Spirogyra and 
Cladophora were there. Larve of may-flies, dragon-flies and 
damsel-flies, various beetles, mostly Dytiscidee and Hyrophilide, 
ereat quantitites of small crustacea and spring-tails, a great many 
chironomids of various species, and with some oligochete worms, 
a few hydrachnids, and hydras—all these and some other forms, 
including Culex, were present in the pool. Water-striders and 
whirligig beetles were very few. The Lemna certainly furnished 
some food to the larve of A. punctipennis, for they were often seen 
to be brushing the leaves, after being brought into the laboratory. 
The larvee were found in plentiful numbers, but always in separate 
groups, as if each had developed from a different laying of eggs. 
Pool 2 was of an entirely different character, and about a quarter 
of a mile away. It was very small, not more than four feet in 
width at the widest place, and about a foot deep. The bottom 
was covered with dead leaves, and the water was clear, and there 
were no visible algze or other plants in it. It was deeply shaded, 
and contained just one brood of larvee, of less than fifty specimens, 
all of about the same size, and nearly ready to change to the pupa. 
They were almost black with a white mid-dorsal line. They were 
the largest larvee that we have found. None found in the spring 
were so well developed as these October forms, from which came 
very large adults. 
All the adults developing in autumn are exceedingly hardy. One 
female emerged from the pupa on November 3, and was left with 
no food or water. On December 2 it was still alive and eagerly 
drank water and fed on moistened dates. It lived for three weeks 
more with access to this food, never having tasted blood, having 
