SERICOSTOMATIDEA. 
DESCRIPTION OF THE CasE.—The case differs from that on 
N. concinnus only in its slightly smaller size, and in the smaller 
number of the “ballast rocks” used during the prepual condition. 
The manner of sealing the case before pupation does not seem to 
differ from that of the previous species. 
NEOPHYLAX AUTOMNUS. 
121. Larva. Head and thorax. 123. Larva. Distribution of gills. 
122. Larva. Frons. 
FAMILY SERICOSTOMATID£E. 
The family, as it now stands, consists of four widely-separated 
subfamilies. No group characters have been found that will 
satisfactorily include the larve of these subfamilies and exclude 
members of other families. 
The same evidence of distant relationship prevails in the habits 
as in the classification. For this reason no attempt is here made 
to discuss the family as a whole, but the known local species will 
be described and discussed under their separate headings. 
HELICOPSYCHE BOREALIS. 
Hasirat.—The larve are found in almost all stony streams 
of the region, and also occur on the rocks of exposed shores of 
Cayuga Lake. Vorhies, who studied the Trichoptera of both 
streams and lakes in Wisconsin, found the larve only in the lakes. 
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