Vorhies—Studies on the Trichoptera of Wisconsin. 649 
for investigations on Trichoptera. Within a distance of thirty 
miles of Madison can he found very diverse conditions, and it is> 
from within this limited territory that most of my material has 
been obtained, ancl its resources have by no means been ex¬ 
hausted. Within this area I have collected and learned to dis¬ 
tinguish some 50 species of larvae, and, from adults taken, I 
infer that there are no less than 100, probably more, to be had 
here. The Hydroptilidae, the “micro-Trichoptera,” have re¬ 
ceived practically no attention and are not included in the 50 
mentioned above. I believe one has need of a few years of ex¬ 
perience with the larger species, before attempting work on these 
minute forms. 
An account of the conditions' existing in the area mentioned 
will be given, so that precise locality references in the descrip¬ 
tions may need no detailed explanation. The city of Madison 
is situated on a narrow strip of land between two lakes; Men¬ 
dota, with an area of about 15 sq. mi., and Monona, about 4 
sq. mi. in area. The Yahara river, connecting these two lakes, 
flows through the eastern part of the city and at the point where 
it leaves Lake Mendota there is a short rapids with a fall of 
three or four feet. Here are the proper conditions for Hydro¬ 
psy chid larvae, and they are present in great abundance. At 
this point Tenney Park stretches along the river for some dis¬ 
tance and some forms may be advantageously collected in shal¬ 
low, weedy lagoons of the park, as well as along the shore of 
the lake itself. Stretching into Lake Mendota like a long finger 
is Picnic Point, about one mile across the water from the west¬ 
ern or University end of the city. Within the base of this 
promontory, west of the University, protected by a low, usually 
submerged bar from the open lake, is a shallow bay with muddy 
bottom,—University Bay. Myriophyllum, Ceratophyllum, Elo- 
dea, Lemna and other vegetation grows here in abundance. 
With the exception of this and similar bays not so conveniently 
located, the shores of these two lakes are sandy, gravelly, or 
stony, with corresponding differences of vegetation, thus afford¬ 
ing a variety of conditions in the open lakes. At the western 
end of Lake Mendota is a large spring, or group of springs,, 
