656 Wisconsin Academy of Sciences, Arts and Letters. 
Pupa. —Length, 25-28 mm. Width, 6 mm. Antennae ex¬ 
tending to the fifth segment. Body in life green, a fuscous- 
band extending along the dorsal wall of the abdomen on either 
side. Dorsal spines, IV, 4-5. 6-8 + 12-15. 6-9. 6-12, VII. 
Lateral line of soft black hairs begins on the fifth, and forms 
a, loop under the eighth segment. Labrum about as broad as 
long; mandible longer than the labrum, toothed on inner edge 
at distal end, a projection on outer side near base bearing two 
long hairs. Gill filaments, Fig. 2. 
Eggs .—An egg mass taken from vegetation in the water of 
Lake V 7 ingra on July 21, proved to be of this species. It 
consisted of a cylindrical mass of clear jelly six mm. in di¬ 
ameter, in which the eggs were imbedded: the ends of this mass 
were bent around and united so as to form a perfect circle with 
a diameter of 3 cm. 
Case. —Length, 50-70 mm. Width, 7 mm. A straight tube 
open at both ends, tapering slightly toward the posterior end 
except just before pupation, when it is equi-diametric, formed 
of rectangular pieces of leaves arranged spirally. The length 
is very variable, but it is usually much longer than the larva 
inhabiting it. When brought into the laboratory, the larva 
very soon cuts off a portion of the case so as to leave it but little 
longer than the body, seeming tO' find it inconvenient in the re¬ 
stricted area of an aquarium. The pupal case, 35-40 mm. in 
length, is closed at both ends bv a, sieve-membrane. Often 
w T hen drawn deep into some hole or crevice an elbow bend is 
added at one end to afford better communication with the water 
outside. 
Habits and Occurrence .—The larvae of this species may usu¬ 
ally be rather easily obtained in the fall and early spring, in 
