LIMNOPHILID&. 
On the mesothorax the chitinous shield is pale-brown, with darker 
markings and black caudal margin terminating laterally in ex- 
panded black marks of varying extent; a broken dark mark is some- 
times present on the cephalic margin. The chitinous plates of the 
metathorax are pale in color; the lateral plates are crossed by two 
dark marks. 
The Abdomen.—On the ventral surface of the first segment 
there are a few weak setz, which are not arranged in clusters. The 
gills are weak and are branched into a few weak filaments. 
DESCRIPTION OF THE CasE.—The case of the larva has the 
form of a cylinder about twenty millimeters long and four milli- 
meters wide. It is made of vegetable matter of various kinds, ac- 
cording to the environment inhabited by the larva. 
A common type of case is made of fragments of bark (figure 
69). These cases generally curve slightly and taper toward the 
caudal end. The cephalic end is without a hood; the sides of the 
caudal end are drawn in to leave a small round opening. 
When the larve live among cat-tails, or where large fragments 
are used, the curve of the case is less apparent, or may be entirely 
absent. Likewise the caudal end is less closed, or may be entirely 
open. 
When living among roots, the larve often fasten root fibers 
along the sides of their cases (figure 70). 
In preparing to pupate the larve roll their cases in dead leaves, 
or in grasses. At such times they are next to impossible to dis- 
cover. 
ARCTECIA CONSOCIA. 
LarvaL Hasirat,—tThe larve occur locally in most streams 
of the region. They are more common in shallow water with a 
slight current, but they are also found in deep waters that are cool 
and well aeriated. 
Hasits.—In their manner of living the larve do not differ 
greatly from Pycnopsyche and its near allies, and, like them, the 
habit of changing the architecture and material of their cases from 
one type to another is frequently practiced. When time for pupa- 
tion approaches, the larve usually hunt the seclusion of matted 
roots along the water’s edge, or crevices in submerged logs or bark. 
On one occasion several pupze were found attached to roots 
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