PLECOPTERA NYMPHS OF NORTH AMERICA 71 
Clioperla ebria Hay 
Length of body up to 16 mm.; antennae up to 8 mm.; cerei up 
to 9 mm. 
General color yellowish brown to darker brown. Head a little 
wider than pronotum; maxillae barely visible from above; a 
yellow mark between the hind ocelli, one in front of the anterior 
ocellus and one each side of the occiput just inside of the eyes; 
occipital ridge absent; hind ocelli a little closer to the eyes than 
to each other; antennae about half as long as the body, and 
made up of about seventy segments. 
Pronotum transversely oval; about twice as wide as long; 
margin with a fringe of short hairs; marginal groove distinct in 
front and rear but indistinct on the sides, which are somewhat 
flanged and light yellow. Front wing pads long, widely separated, 
-and lying almost parallel with the body; hind wing pads diverg- 
ing outward from body. Legs slender, not much flattened, and 
with a very feeble fringe of long hairs. Cerei composed of about 
thirty-two segments, the terminal segments about five times as 
long as wide. 
Described from three mature male nymphs ‘collected by G. S. 
Dodds in Tolland, Colorado, and one female nymph without 
locality label. 
Clioperla similis Hagen 
Length of body up to 10 mm.; antennae 5 mm. 
Color yellowish brown. 
Head slightly wider than pronotum; hind ocelli about as close 
to the eyes as to each other; occipital ridge absent; antennae 
about half as long as the body and composed of about fifty-five 
segments. 
Pronotum transversely oval; about twice as wide as long; mar- 
ginal groove distinct in front and rear but indistinct on the 
sides. Wing pads well developed and very similar to those of 
C. cho. 
Legs slender, with a thin fringe of long hairs. 
Mouth parts very similar in structure to those of C. clio. 
Described from a single reared male nymphal skin from Ring- 
wood, Ithaca, New York, April 17, 1922. P. W. Claassen. 
Genus ISOPERLA Banks 
This genus includes nymphs which, when fully grown, do not 
measure much over 10 mm. in body length. 
General color yellow and brown, often longitudinally striped. 
