September, 1942 
exuviae, and June 16, 1938, 1 nymph, T. H. 
Frison & T. H. Frison, Jr.; Little Pigeon 
River, June 17, 1938, T. H. Frison & T-. ek 
NYMPHAL MANDIBLES 
NYMPHAL MAXILLA 
ADULT HEAD 
AND PRONOTUM 
Fig. 47.— 
Acroneuria 
NODE ficelate DULT HEAD 
AND PRONOTUM 
Prison, Jr., 1 nymph. MAryviLle: May, 1923, 
+ nymphs. ELKMonrt, Little River: June 17, 
mee, Ll. H. Frison & T. H. irison: a) 1.021 
lymph, 3 exuviae. GREAT SMOKY MOUNTAINS 
NATIONAL Park, Chimneys Camp Grounds: 
july 3-9, 1939, A. C. Cole, 12. 
Acroneuria carolinensis (Banks ) 
_ Perla carolinensis Banks 
Jriginal description, ¢, 9. 
Acroneuria lycorias Claassen CLOSED. 82 )e 
Vymph—new synonymy. 
Acroneuria lycorias Frison (193759 0.2:97)'. 
troneous synonymy of cuestae Ricker. 
(1905, p. 215). 
This is another species of Acroneuria 
vhich has been infrequently recorded in 
‘terature and confused with other species. 
‘eared specimens of both carolinensis and 
ycorias (Newman) prove that Claassen 
1931) erroneously associated the nymph 
f carolinensis with the species /ycorias and 
tiled to recognize the nymph of lycorias 
= perbranchiata Neave). 
Frison: NortrH AMERICAN PLECOPTERA 
281 
[linois Natural History Survey rear- 
ings and collections in various states where 
both carolinensis and lycorias occur have 
led to the discovery that the nymphs of 
the former have no anal abdominal gills, 
whereas such gills are present in lycorias. 
A corollary of this, of course, is that the 
subanal lobes of the adults in both sexes 
in lycorias possess anal gill remnants, 
whereas these remnants are lacking in 
carolinensis. Such an easily observed char- 
acter as the presence or absence of anal 
gills or gill remnants is most important 
and useful when dealing with two species 
which look so much alike. 
In 1937, I placed cuestae Ricker 
(19356) in the synonymy of Jlycorias. 
This placement was in error and resulted 
NYMPHAL 
aie MANDIBLES = 
lag 
NYMPHAL LABIUM 
NYMPHAL MAXILLA 
ADULT HEAD AND PRONOTUM @@ 
Fig. 48.— 
Acroneuria 
carolinensis. 
from the erroneous identification of reared 
male and female specimens from New 
York, sent to me by Dr. P. W. Claassen 
as lycorias, and their association with 
exuviae which Dr. Claassen figured 
(1931) as lycorias. These adults, how- 
ever, are without question carolinensis and 
are properly associated with exuviae with- 
out anal gill remnants. Correctness of this 
association of nymphs with adults is con- 
firmed by rearing of an adult male of 
