280 
1 nymph, 6 exuviae; Pigeon River, June 14, 
1940, Frison et al., 6 nymphs, 1 exuvia; June 
16-17, 1940, Frison et al. 26, exuviae 
(reared); June 20, 1940, Frison et ae 1, 
exuvia (reared) ; June 27, 1949, Frison et al., 
19, exuvia (reared) ; Le Conte Creek, June 
14, 1940, Frison et al., 4 exuviae; Little Pigeon 
River, June 12, 1935, H. H. Ross, 9 nymphs. 
VIRGINIA. — CuRLEY’s Neck Bripce: April 
19, 1938, M. E. Davis & D. T. Ries, 1 nymph. 
Great Fatis: April 3, 1938, B. D. Burks, 1 
nymph. Bic MEAbDows, Skyline Drive: Jan. 1, 
1939, Frison & Burks, 1 nymph. CRIGLERSVILLE, 
Rapidan River: March 27, 1938, B. D. Burks, 
1 nymph. Fairrax: Dec. 31, 1938, Frison & 
Burks, 5 nymphs. Mapison, Crooked Run 
Creek: Jan. 1, 1939, (Frison’o& Burks, 13 
nymphs. SPEEDWELL: March 22, 1940, Frison, 
Mohr & Hawkins, 1 nymph. FALLs CHURCH: 
June 11, 1Q (collection of N. Banks); April 
2, 1941, B. D. Burks, 1 nymph. 
Acroneuria georgiana (Banks) 
Perla georgiana Banks (1914, p. 608). Orig- 
inal description, @. 
Since this species was first described 
from a single female from Clayton, Ga., 
June, 1909, Type No. 11,328, Museum 
of Comparative Zoology, it has been re- 
corded again only from “Tallulah Falls, 
June 17, Georgia,” and from “North Car- 
olina,” both records by Needham & Claas- 
sen (1925). 
Illinois Natural History Survey field 
work in the Great Smoky Mountains Na- 
tional Park over a period of years revealed 
the presence there of a small Acroneurta 
nymph which was suspected of being the 
nymph of georgiana. In 1940, male adults 
of georgiana were reared from this nymph, 
thereby definitely establishing this rela- 
tionship. 
Since the nymph has not been previously 
recognized, a brief description of its most 
important characters is given here. Gen- 
eral morphological features similar to 
other described nymphs of Acroneuria 
(Frison 1935a). Body and appendages 
mostly uniformly yellowish brown, with- 
out a prominent, contrasting, dusky or 
dark color pattern, except on dorsum of 
head, fig. 46. Head with a distinct trans- 
verse occipital ridge on posterior margin 
between compound eyes. Maxilla, labium 
and mandibles as in fig. 47. Anal gills 
present at apex of abdomen. Approxi- 
mately full grown nymph with length of 
15 mm. 
Needham & Claassen (1925) have 
figured the most important characters of 
the male and female. It should be added 
Iuttrnois NatuRAL History SURVEY BULLETIN 
V ol. 22, Arta@ 
to their description that in fresh material 
the adult males are very pale colored and 
the dark brown or dusky markings on the 
dorsum of the head form a very distinctive 
pattern, fig. 47. 
Records for this species in the collection of 
the Illinois Natural History Survey are as 
follows. 
NortTH CAROLINA. — SMOKEMONT: June 14, 
1935, H. H. Ross, 1 nymph. RAINBOW GAP: 
April 24, 1938, H. H. Ross & B. D. Burks, 
1 nymph. Montreat, Lookout Cove: July 2, 
1928, O. Park, 6¢. Graybeard Mountain near 
MontreEAT, west fork of Flat Creek Cove: 
July 7, 1928, O. Park, 1¢. 
TENNESSEE.— GATLINBURG: June 17 and 26, 
1940, T. H. Frison et al., 2¢, reared; Fight- 
ing Creek Gap, May 15, 1939, T. H. Frison 
Fis. 46.—Nymph of Acroneuria georgiana. 
& H. H. Ross, 2 nymphs; Fighting Creek Gap 
May 27, 1934, TI. H. Frison, 6 nymphs; Little 
Pigeon River near Alum Cave Trail, June 17 
1938, T. H.. Frison>& Tae Frison, Jr, ! 
nymph; Le Conte Creek, June 18, 1938, : 
