28 
Psyche 
[March 
name of species and collecting data, and were visited once 
or twice a day in order to catch the subimagos as they 
crawled out of the water onto the part of the cage above 
water. The subimagos were then put into paper bags, 
which were labelled as to species, date of collecting and date 
of subimago transformation. The paper bag, because of 
the roughness of its surface, offers an excellent place for 
the imago to crawl out of its subimago skin. The paper 
bags were investigated each day, also, in order to get the 
imago as soon after transformation as possible. As a re- 
sult, all stages of the above-listed species were obtained, 
and some observations made on the relative length of time 
of subimaginal transformations. For the most part, the 
males in all species reared seemed to require slightly more 
time than the females for this last molt. 
The collecting was done in the streams around the gen- 
eral vicinity of Ithaca. Fall Creek borders the campus on 
the north and collections were made in it at various points 
from the campus to Freeville, a small town about eight 
miles northeast of Ithaca. Cascadilla Creek borders the 
campus on the south, collecting being done in it upstream 
over a distance of about three miles. Further collecting 
was done in Salmon Creek ten miles northeast of Ithaca, 
in Van Buskirk’s Glen ten miles to the south, in Slaterville 
Wild Flower Preserve fifteen miles to the east, in Six Mile 
Creek two miles to the south, in North Harford Brook 
(Cortland County) twenty to twenty-five miles to the north- 
east, in North Spencer Stream about fifteen miles south, 
in Enfield Glen seven miles to the south, and in Otter Creek 
which borders on the southwest of Cortland, N. Y. 
Ephemerella cornuta Morgan 
Male imago: 
Measurements: body 10 mm., tails 11 mm., fore leg 9.5 
mm., fore wing 9 mm., hind wing 2.5 mm. Eyes and ocelli 
dark brown ; antennae light-brown. Thorax a uniform dark 
brown. Abdomen a rather light gray-brown. Wings hya- 
line, brownish at the bases. Axillary cords of the fore 
