254 Annals Entomological Society of America  [Vol. VII, 
In 1888 the same author mentions finding the larvae in a 
similar situation in Ithaca, the nets and cases being very 
abundant on the Simulium-covered rocks. « ‘‘The nets differed 
from those found at Washington and the species is probably 
different.’’ 
In his Insect Book (1901) we find the following: ‘The 
cases were preferably placed at the edge of slight depressions 
in the rocky surface so that the tubular portion was protected 
from the full force of the current. On the surface of a rock 
about 18 inches in diameter 166 of these nets were counted.”’ 
Adele M. Fielde (1887) writes from Swatow, China, of a 
net similar to those previously described. ‘During last 
January I found on the level surface of the coarse sand which 
covers the bottom of an aqueduct near here, under an inch or 
two of clear running water, little structures resembling a 
gray net spread to catch fish or a tiny cave with a gauze awning 
stretched over the entrance. The arches had a span of from 
an eighth to half an inch and always opened towards the 
current. They were to be seen in scores with a buttress of 
coarse sand in the rear, and a minute aperture in the floor. 
The occupant of the wee grotto was in every case a caterpillar 
not more than five-eighths of an inch long. It burrowed in 
the sand of the floor, stretched its head forth vertically, and 
fed upon what had been caught in the delicate roof of its den.”’ 
Comstock, J. H., (1895) in speaking of Hydropsyche larvae 
says: ‘‘Stretched between two stones near by can be seen his 
net. Thisis made of silk. It is usually funnel-shaped, opening 
up stream; and in the center of it there is a portion composed 
of threads of silk extending in two directions at right angles 
to each other, so as to form meshes of surprising regularity. 
These nets occur in rapids between stones, but in many places 
they are to be found in greater numbers along the brinks of 
falls. Here they are built upon the surface of the rock, in the 
form of semi-elliptical cups, which are kept distended by the 
current. Much of the coating of dirt with which these rocks 
are clothed in summer is due to its being caught in these nets.” 
Betten, C. (1901), says of a Hydropsyche sp. (near phalerata, 
Hagen), that there was ‘‘no larval case, only strands of silk 
between the rocks.” 
