G50 Wisconsin Academy of Sciences, Arts and Letters. 
known as Merrill’s Springs, from which a short, swift stream 
leads to the lake, a distance of not more than 75 feet. 
A third small lake, with muddy bottom and many weeds, of 
which the principal one is Potomageton, lies south-west of the 
city, adjoining a suburb. This is Lake Wingra. It is sur¬ 
rounded by extensive marshes and fed by several large springs. 
The streams from these springs, except a very short distance at 
the head where they issue from the base of the higher ground, 
are rather sluggish as they flow thru the marsh, but quite cool 
in summer and unfrozen in winter. Some Elodea occurs in 
these streams, but the most plentiful form is Nasturtium offi¬ 
cinale. 
These, with numerous marshes and pools scattered about the 
eountry, form the chief collecting grounds in the immediate 
'vicinity of the city. At a distance of 30 miles north-west lies 
the Devil’s Lake region, which furnishes many species not found 
at Madison. The collecting grounds of this area worked by me 
consist of the Lake (not differing in its Trichopterous fauna 
from the Madison lakes) and some small streams issuing from 
the range of hills along the valley of the Wisconsin river, known 
as the Baraboo Mts. One spring-fed brook flowing into the lake 
has furnished its quota of material. At a distance of five or 
six miles north-east of the lake there is a small canyon in the 
side of the range, known as Parfrey’s Glen. Rushing thru 
this Glen is a cold stream which, in the distance of less than a 
mile, has a fall of about 300 feet. Ilydropsychid and Rhya- 
■cophilid larvse are abundant here, as well as some other larvae 
not obtainable near the city. The larvae and pupae for rearing 
were collected, carried four miles to the railway station at Mer- 
rimac, and thence by rail to Madison. Needless to say, the mor¬ 
tality was great, yet with care much can be thus accomplished. 
The Wisconsin River, accessible at Merrimac, between Madison 
and Devil’s Lake, was not worked, but furnishes conditions suit¬ 
able for some of the forms inhabiting large streams. 
No forms have been reared from outside the region described, 
but a few adults and larvse have been collected in other parts 
of the state, which may be referred to without further explana¬ 
tion. 
