Vorhies—Studies on the Trichoptera of Wisconsin. 697 
esting possibility is here suggested that perhaps we have in this 
case an instance of dimorphism among the males of the species. 
If only one species, exquisita has precedence. 
Larva. —Length, 13 mm. Width, 2 mm. Body green in 
life, with double row of bright yellow spots of fat showing on 
sides of body thru the integument. Head yellowish-gray with 
black forked line lying along suture of clypeus; posterior por¬ 
tion of sides grayish, irregularly punctate with white; black in 
the middle beneath. Antennae conspicuous, light colored; man¬ 
dibles black. Labrum yellow. Pronotum not darkly colored, 
with a median white line; on either side a white sigmoid line 
extending diagonally so as to separate each lateral half of the 
segment into an anterior outer third, and a posterior inner two- 
thirds ; bordered posteriorly with a double black line, except a 
wide middle portion; a. three-lobed patch of very light color 
next to the posterior border, the outer lobe the longest. Meso- 
notum not chitinized except strong black bar of chitin on sides 
for the attachment of the third pair of legs, which are much 
farther dorsal on the body than the others. First legs white, 
the others black, lighter at the joints. Ho gills and no lateral 
line. Lateral humps furnished with a paddle-shaped piece of 
chitin, of which the handle is strongly chitinous and the broader 
part thickly set with bristles pointing forward. A row of short 
stout spines or pieces of chitin along either side of the 8th seg¬ 
ment. 
Pupa. —Length, 12-13.5 mm. Antennae as in the adult. 
The extremely long antennae of the males are coiled about the 
bases of the posterior appendages, both being wrapped the same 
way in any individual, but either from left to right or from 
right to left. A small group of hairs on the base of each ap¬ 
pendage points forward, acting as a guard to prevent the coils 
of the antennae from slipping over the posterior extremity. Ab¬ 
domen in life bright green. Dorsal spines, III, 2-3. 2. 2 + 
7. 3-4, VI. Two lines of chitin on the dorsal side of the 
abdomen, black on the anterior part of each segment, lighter on 
the posterior part; same on the ventral side. The tergum of 
the 1st segment is bordered laterally by a line of chitin ending 
posteriorly in a spiny knob, and along the posterior border of 
