Vorhies—Studies on the Trichoptera of Wisconsin. 709 
a median excision, and just back of the expanded portion on 
either side is a rounded hump of chitin. 
Larva. —Length, 14-15 mm. Width, 3 mm. Body yellow¬ 
ish or greenish. Head yellow beneath, dark brown above, each 
succeeding segment a. little lighter than the one before, the legs 
yellow. The light yellow posterior part of the head is naturally 
retracted within the pronotum so that only the darker portion 
is visible. On this darker portion are six light spots, two 
median, with two on either side. Eyes situated in a light area. 
The mesothorax has a black lateral border, and a heavy black 
semi-circular mark in the middle of the posterior edge. Meta- 
notum similar, but with only a median black spot posteriorly. 
The clypeus is flattened, almost concave, giving the larva a pecu¬ 
liar appearance in lateral view. Ho lateral line of hairs, but 
short, pointed protuberances directed backward occur on the 
posterior edge of each segment at about the position usually oc¬ 
cupied by the lateral line. Gills present only on the ventral 
side; the mesothorax and 7th segment each with two stalks, and 
the intervening segments each with four, the stalks sometimes 
double. Each proleg terminated by a tuft of heavy hairs above 
the hook. The prothorax has a chitinous sternum back of the 
legs. 
Pupa. —Length, 11 mm. Width, 2.5-3 mm. Yellowish, a 
little reddish on the dorsal side; short dark brown or black 
pubescence beneath and on sides of abdomen, denser at the pos¬ 
terior end. A transverse row of longer hairs on the posterior 
part of the 4th to 7th segments above, less dense posteriorly. 
The hooks and plates on the dorsal segments are quite different 
in appearance on different segments: the anteriorly directed 
hooks are on the 3rd and 4th segments and none are present on 
the 5th. Dorsal spines, II, 9. 14 + 72. 9 + 10. 8. 6. 5. 
4, VIII. The posterior end of the body is terminated by a 
pair of stout processes, flattened distally, the flat face looking 
outward and upward, a strong spine at the inner, dorsal ex¬ 
tremity, and another at the outer ventral angle. A group of 
heavy black hairs is borne on the outer side just anterior to the 
latter spine, with lighter ones on the flattened face and posterior 
to the heavy ones. The labrum is rounded, shorter than wide, 
