Vorhies—Studies on the Trichoptera of Wisconsin. 657 
lakes or smaller bodies of standing water, where Elodea is 
abundant. A little time after the ice melts in the spring it 
seems almost impossible to find them by the ordinary scoop net 
method. However, if one pulls out of the water fragments of 
dead wood, a careful examination of the cracks will disclose the 
fact that the larvae have wedged themselves with their cases 
into crevices and holes where they fit so tightly as to be difficult 
to dislodge. In such places the cases are tightly anchored with 
silk, and pupation takes place. The actual transformation 
takes place in May. When the imago emerges it leaves the 
pupal skin upon the surface of the water. The larvae may be 
easily reared from the eggs if given plenty of Elodea. They 
are rapacious feeders, and if vegetable food runs short they 
resort to cannibalism. Unless disturbed the larvae are usually 
quiescent during the daytime, and an examination will often 
prove the case to be attached to the dish at the anterior end by 
a thread of silk. I reared one brood from the eggs to a consid¬ 
erable size. My notes show the following order of events: 
hatching and working out of the jelly, July 23: building cases, 
July 27-28. The first cases were very irregular, of an aver¬ 
age length not exceeding 2.5 mm. July 30, a spiral construc¬ 
tion was evident in many of the cases. Aug. 2, the cases were 
from 3 to 4 mm. in length and distinctly spiral. The last one 
of these died the following January, having reached a length 
of 30 mm. 
The larvae have been taken in Devil’s Lake, Lake Wingra, 
University Bay, and Tenney Park, in practically every month 
from September to June. Although I have several specimens 
of imagos, they have all been obtained by rearing, not a single 
specimen having been taken with the net or by means of the 
trap lantern. In the laboratory they appear in June and early 
July. 
(PI. LIL Fig. 2. PI. LIV, Figs. 1-6.) 
