Vorliies—Studies on the Trichoptera of Wisconsin. 677 
lateral line of the larva. The split next involved the head. 
The pupa continued the contractile movements, and, partly by 
means of the spines on the dorsal side, worked the skin back¬ 
ward over the body so that a larger and larger amount of free 
skin could be seen posteriorly. Within ten minutes the head 
and thorax were free, except the antennae and long appendages. 
The process then went on. steadily until the skin, without fur¬ 
ther splitting, was worked off at the posterior end. As a re¬ 
sult of the crawling movements, the pupa had its head tightly 
jammed against the anterior end of the case during the molting 
process. Twenty-three minutes after the split was first noticed, 
the pupa was entirely free. Probably an average of twenty- 
five minutes is sufficient for the molt after splitting of the lar¬ 
val skin, but some hours seem to he necessary to produce the 
rupture. The splitting of the head occurs along the sutures 
of the clypeus. Two days later a considerable portion of the 
cast skin of the abdomen had been forced out through the pos¬ 
terior aperture. In three days some of the legs had passed 
out. Unfortunately this pupa died before transforming, so no 
further observation could be made upon it. 
Larvae have been taken from springs flowing into Lake Gen¬ 
eva, Walworth County, from Merrill’s Springs, from the springs 
at Devil’s Lake, the stream in Parfrey’s Glen and a neighboring 
stream, and from the large springs at Lake Wingra previously 
reported (1905). 
While the statement previously made as to the time of ap¬ 
pearance of the adults is correct, so far as what may be called 
the maximum appearance is concerned, a few stragglers may be 
found during the summer and autumn. They may be easily 
captured from beneath the sticks and stones near the water, but, 
if once they start to run or fly, they are very active and difficult 
to catch. As late as Oct. 12 four egg masses were taken, after 
diligent search, where perhaps as many dozen might have been 
obtained in April or May. On Nov. 2, one egg mass was found, 
but the eggs were unfertilized. Eggs deposited in the labora¬ 
tory hatched in eleven days. 
(PI. LIT, Eig. 9. PL LV, Figs. 21-26. PL LVI, Figs. 
1-4.) 
