G60 Wisconsin Academy of Sciences, Arts and Letters. 
Pupa. —Length, 23-30 mm. Width, 4-5 mm. Antennae 
extending to the fourth or fifth segment. Body in life green 
in young pupae, later becoming somewhat fuscous above. Dor¬ 
sal hooks, III, 4-5. 5-6. 5-6 + 12-15. 6-8. 7-9, VII. Lat¬ 
eral line extends from the 5th segment to the 8th, forming a 
loop under the latter. Gill formula as in the larva, except 
there are no gills on the first segment. Labrum and mandibles 
not strongly chitinized, the length of the labrum 1.5 times its 
width: mandibles short, length and breadth sub-equal, with a 
projection on the outer side, bearing two long hairs. 
Case. —Length, 40-47 mm. Width, 6-7 mm. A slightly 
curved tube, open at both ends, composed of rectangular pieces 
of leaves or thin bark, not arranged spirally, but formed of 
successive rings of material, usually three to five of these rings 
forming a single case. The pupal case is almost straight, closed 
at the anterior end by a loose mass of silk and vegetable debris, 
thru which the pupa with its weak mandibles may make its 
way out. The posterior membrane is sieve-like, but not very 
strong. 
Habits and Occurrence .—The larvae of this species are to be 
found in the streams flowing into Lake Wingra, where they 
live among the water cress, and also from the pools of the 
swifter stream at Parfrey’s Glen, where their food appears to 
consist mostly of dead leaves, at least in the winter and spring. 
They are most abundant in the former habitat. For some time 
I was at a loss to account for the disappearance in the spring¬ 
time of this species from these streams. The beds of the 
Wingra streams are composed of lumps of peaty material worn 
into fantastic shapes by the flowing water. These lumps are 
honey-combed with larger or smaller openings, fornaed, in at 
least some cases, by decaying roots. The larvae, as the time for 
pupation draws near, in May, draw their cases tightly into these 
holes, where they may only be found by tearing apart the 
lumps of peat. They are entirely invisible from the exterior. 
As most of these are blind holes, there can be no flow of water 
thru the case. The length of pupal life is apparently from 
two to four weeks. The pupa emerges from its skin on the 
surface of the water, leaving the cast skin floating. This stage 
