LIMNOPHILID&. — 
grass abounds, to the middle of the stream where living vegetation 
is entirely absent. Here they attach the front ends of their cases 
firmly to some solid support, as a stick or stone. Often many of 
these pupe are found congregated on a single small stick, while 
on the other sticks in the region they are entirely absent. 
Foop or THE Larva:.—The food consists, apparently, entirely 
of vegetable matter. Several stomachs from specimens taken at 
different periods of late spring and early summer were examined. 
These contained only the tissue of higher plants, but it seems prob- 
able that during the cold weather, when diatoms abound, these 
may compose a considerable portion of the diet of this species. 
Prrtop oF EMERGING.—This species is one of a few Trichop- 
tera known to us which emerge during a long period. On May 22 
there were pupe in the stream, but no empty cases were found. 
On June 7 the first specimens in captivity emerged, but at that 
time there were many empty cases in the stream. From June 7 
until July 22, when the last captive specimen emerged, their trans- 
formations in the cages were of almost daily occurrence. On the 
latter date, however, there were still many pupz in the stream, and 
also a few prepupe. From this data we may assume that the 
species is on the wing from early June until the middle of August. 
DescripTIoN oF Larva.—Length, when mature, 17—20 mm. ; 
breadth, about 4.5 mm. 
Head.—The dorsal markings are shown in figure 51; on the 
sides the head is light-brown mottled with dark-brown or black 
in the region behind the eye; the venter is light-brown in front, 
becoming darker toward the hind margin. The labrum is shown 
in figure 53; the frons in figure 55, and the labium and maxille, 
in part, in figure 54. 
The Thorax.—The dorsal markings are shown in figure 51; 
on the sides, above each coxa, there is a dark chitinous plate bear- 
ing a group of sete near its front margin; the venter is uniform 
in color. The “horn” on the ventral side of the prothorax is slen- 
der and evenly curved forward. The legs are dark-brown, mar- 
gined and mottled with dark-brown and black. 
The Abdomen.—The first segment is darker in color than the 
succeeding segments ; it is armed with a few sete in the region of 
the humps and on its ventral surface; segments two to seven bear 
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