170 NEW YORK STATE MUSEUM 
Before setting up this tent we had done some desultory collecting 
from the bed of this stream, but we had found the immature stages 
of only a few of the insects that the tent trap revealed. We had 
found those stone fly and May fly nymphs that live amid the moss 
that covers the submerged stones [see pl. 9, fig. 1]. This is 
a soil-gathering moss that grows in tufts, so matted together that 
a bottom layer of fine sand and silt is held closely about the stone, 
even when it is exposed to the wash of the current. The stone 
flies of the genus Chloroperla and Leuctra were found in this moss, 
and the May flies of the genus Ephemerella. There were two 
species of Chloroperla: the common widely distributed C. bili- 
neata Say, and another larger, apparently undescribed species. 
The latter was less abundant, 23 specimens being taken in the 
tent between July 17 and August 2. Both species climbed up 
the sides of the tent (the lower edges of which dipped into the 
surface all around) to transform, leaving their empty skins sticking 
to the cheese cloth anywhere from a few inches to a few feet above 
the surface of the water. 
The May fly Ephemerella was also a new species. It is described 
on a subsequent page as EF. dorothea. Its nymphs lived down 
between the moss stems on the surface of the sou beds covering 
the stones. The nymphs of Baetis disported themselves more 
openly in the edges of the current. These are exceedingly agile 
little creatures. The nymphs of Heptagenia clung, as is their wont, 
to the under surfaces of bare stones. 
The caddis flies that appeared in the tent were fewer in individ- 
uals but they represented a much greater number of species. 
There were three species of Ryacophilidae; eight of Hydroptilidae ; 
two of Sericostomatidae, and one of Limnophilidae. These are 
all in Dr Betten’s hands and will be noticed in his bulletin, now in 
preparation, on New York Trichoptera. 
The order Diptera was represented by no less than nine families, 
and two of these, the Tipulidae and Chironomidae, are of. very 
great importance in such situations, while two Psychodidae and 
Culicidae are of slight importance: this is not the type of aquatic 
situation suited to their development. In the Tipulidae, the great 
abundance of three species, Rhaphidolabis tenuipes, 
AMMNEOCINA OPpalhinanea ancl Dicramonmyila déiumeta 
was especially noteworthy. The Tipula, represented by but two 
female specimens, remains undetermined. Those put under “ mis- 
cellaneous”” in the table were Rhipidia maculata, repre- 
