672 Wisconsin Academy of Sciences, Arts and Letters. 
case closely resembles that of the genus Silo. The pupal case 
is like that of the larva, except that it is closed at both ends by 
a single stone, beneath the lower edge of which a narrow space 
is left, guarded with a grate-like structure of silk. 
Habits and Occurrence. —These larvae are found in the short 
stream at Merrill’s Springs, and in Parfrey’s Glen. At Mer¬ 
rill’s Springs they are very abundant, but peculiarly, except in 
this restricted habitat, none are to be found in the vicinity of 
Madison. When pupation time approaches, the larvae cluster 
densely in crevices of rocks or logs. Apparently they lie within 
the closed case for a rather long period before transforming to 
pupae. 
The imagos were most abundant at the springs in October 
and November. They are sluggish, showing little disposition 
to fly when disturbed, perhaps on account of the coolness of the 
atmosphere at that time of the year. They may be easily picked 
up with the forceps at the water’s edge, where they hide under 
the vegetation, and in crevices. In cages in the laboratory, 
they were observed to be very active at dusk. 
(PL LII, Pig. 3. PI. LV, Pigs. 9-20.) 
Platyphylax designatus Walker. 
Limnephilus designatus Walker, Brit. Mus. Cat. Neur., Pt. I, 
1852, 24. 
Enoicyta designata Hagen, Syn. Neur. N. Am., 1861, 269. 
Platyphylax designatus McLachlan, Jour. Linn. Soc. Lond. 
Zool., XI, 1871, 110. Banks, Cat. Neur. Ins. IT. S., 1907,. 
39. Ulmer, Notes Leyden Mus., XXVIII, 1906, 20^ 
Gen. Insectorum, Pasc. 60, 1907. 
Imago. —Length of body, 9-11 mm. Expanse, 26-30 mm. 
Antennse luteo-fulvous, fuscescent at tips, basal joint above with 
luteous hair, beneath darker. Body fuscous above, luteo-fulvous 
beneath. A pair of small warts (inconspicuous in dry speci¬ 
mens) just above the median ocellus, a large diagonal posterior 
pair on head, a transverse pair on the pronotum, a linear pair 
and a posterior median one on the mesonotum, all clothed with 
