62 THOMAS SAY FOUNDATION 
except as the adult colors are seen through the chitin of the 
maturing nymphs. Head smooth and feebly pilose; rest of body 
very hairy. Legs hairy, and tibiae with a feeble fringe of fine 
long hairs. Cerci with fifteen segments, the distal segments with 
hairs as long as the segments. 
This species occurs in the Eastern States and the above descrip- 
tion has been made from mature nymphs collected at Clinton. 
New York, May 15. 
Alloperla pallidula Banks 
Length of body up to 7 mm.; antennae up to 2.8 mm.; cerei up 
to 3 mm. 
General color light brown; wing pads and abdomen covered 
with long hairs. 
Head slightly wider than pronotum; surface smooth and 
sparsely clothed with hairs; eyes and ocelli black; hind ocelli 
much closer to eyes than to each other; antennae with about 
forty segments. Pronotum transversely oval, about half again 
as wide as long; front and hind margins straight; all angles 
broadly rounded; surface slightly rugose and somewhat hairy, 
with a few long hairs on the outer margin. Meso- and metanotum 
wide; wing pads broadly rounded on the sides; surface of meso- 
and metanotum smooth, but covered with long hairs. Legs some- 
what flattened, hairy; tibiae with a thin fringe of long hairs on 
the outer margin. 
Abdomen quite uniformly brownish, hairy; cerei with about 
fifteen segments, the middle segments about four times as long as 
wide, segments at the tip five to six times as long as wide. 
Described from nymphs collected in the Big Thompson River, 
Estes Park, Colorado, on August 2, 1921. 
Little is known of the habits of these nymphs except that they 
live in swift water and that the mouth parts indicate that they 
are mainly carnivorous. At the time these nymphs were collected, 
numerous adults were also collected from the alders and willows 
along the Big Thompson River. Mr. Rowher informs me that he 
has observed the adults of this species feeding upon the honey 
dew which the aphids were secreting on the alders along the 
streams in Colorado. 
Alloperla spatulata Needham and Claassen 
(Plate 17, fig. 191.) 
Length of body up to 11 mm.; antennae up to 4 mm.; cerci 
up to 2.5 mm. 
