September, 1942 
ation of males with females as 
Needham & Claassen (1925), 
Nympu.—A brief description of the im- 
portant characters of the nymph is as fol- 
lows: General morphological features 
similar to those of other described nymphs 
a 
MANDIBLES 
ANE 
NX 
NYMPHAL LABIUM 
NyYMPHAL 
MAXILLA 
given by 
ADULT HEAD AND PRONOTUM 
Fig. 45.— 
Acroneuria 
xanthenes. 
Eritrea ueeotteds., yg itil 
ot Acroneuria (Frison 1935a). Body and 
appendages yellow with a very distinctive 
pattern of dark brown or dusky markings 
m dorsum, fig. 44; large open area an- 
erior to ocelli is particularly distinctive ; 
lorsal abdominal tergites with narrow, 
lark, transverse bands on anterior and 
osterior margins, these bands usually be- 
oming fused in part on apical segments. 
dead without a transverse occipital ridge 
M posterior margin between compound 
‘yes. Maxilla, labium and mandibles as 
n fig. 45. Anal gills present at apex of 
ibdomen. Approximately full grown 
ymph with a length of 20 mm. 
The most important structural char- 
cters of the adult do not need to be re- 
lescribed since the female subgenital plate 
as been well illustrated by Klapdlek 
1923a) and Needham & Claassen 
1925), and the male by the latter 
uthors. To aid with its determination, 
Frison: NortH AMERICAN PLECOPTERA 
219 
I now add an illustration, fig. 45, show- 
ing the dorsal color pattern of the head 
and pronotum. This pattern is especially 
distinctive among Acroneuria because of 
the dusky lateral margins on the pro- 
notum. In fresh material, these margins 
contrast with the rest of the surface, which 
is entirely yellow or yellowish, except for 
black ocelli and compound eyes. 
Acroneuria xanthenes has been previously 
recorded only from Georgia and North Caro- 
lina. Supplementary and new state distribu- 
tional records are as follows. 
FLORIDA.—LIBERTY CouNTY: Camp Torreya, 
April 12, 1930, 5 nymphs; Torreya State Park, 
Dec. 10, 1937, L. Berner, 4 nymphs. 
GEORGIA.— ATLANTA: May 30, 1937, P. W. 
Fattig, 1¢. Jones County, 10 miles north of 
Macon: April 30, 1938, L. Berner, 1 nymph. 
NorTH CAROrINA, — MontTreEAaT, Orlando 
Park: June 21, 1929, 1g. CHEROKEE: June 
26, 1938, W. Stehr, 12. Marion: April 24, 
1938, Ross & Burks, 1 nymph. SMOKEMONT: 
June 14, 1935, H. H. Ross, 2 exuviae. JAcK- 
SON CouNTy: Chattooga River, Aug. 28, 1938, 
T. Howell, 1 nymph; Norton Mill Creek, 
Auge. 8,9 1938. 7h Howell, 1 nymph. Hor 
SPRINGS, French Broad River: June 15, 1935, 
H. H. Ross, 1 exuvia. NEWFouND GaP, 2,560 
feet elevation: May 28, 1934), 13H. +Frisoni, 
2 nymphs. Macon County: Edward’s Creek, 
Aug. 26, 1938, T. Howell, 1 nymph; Nantahala 
River, May 30, 1939, T. Howell, 1 nymph. 
Swain County, Smoky Park, Forney Creek: 
eile el3, 193950. Howell d nymph. JACKSON 
CouNTy: east fork of Tuckaseegee River, June 
13, 1939, ‘IT. Howell, 4 nymphs; Slicken Creek, 
Junie 1411939 A Howells 2 nymphs; Knob 
Creeks Miulye20,.00193 99, Howell, 1 nymph; 
west fork of Tuckaseegee Rivers julyer20. 
1939, 1 nymph. 
OxH10.—Waterloo Township, ATHENS Coun- 
TY, branch of Grass Run: May 15.1941 aD. 
Walker, 3 nymphs. 
PENNSYLVANIA. — JENKINTOWN, Montgomery 
County: Aug. 15, 1939, A. M. Laessle, 1 
nymph. 
TENNESSEE.—GREAT SMOKY MouNnTAINS Na- 
TIONAL PARK: Grassy Patch, July 22, 1939, A. 
C. Cole, 72 ; Chimneys Camp Grounds, July 
TZ 1939 A.C, Coleylige 60% Chimneys Camp 
Grounds, at light, July 16, L739 Ca Cale: 
23, 102; Chimneys Camp Grounds, July 
20224 at 939 Aen mColes 5: Ore Chimneys Camp 
Grounds, at light, July 3-9, 1939, A> C) Cole: 
102; Chimneys Camp Grounds, 2,700 feet, 
June! 71939" SAT Ge Coles 14; Greenbrier 
Cove, 2,400 feet, July 19, bo me On Cole: 
19. SMoky Mountains: June-July, 1940, A. 
C. Cole, 19. Etxkmont, Little River: June 
L750 193 See He erisony Sec) 6 i. Frison, Jr., 
4 exuviae. OZONE: June 11, 1935, H. H. Ross, 
2 exuviae. GATLINBURG: June 15, 1940, T. H. 
Frison et al., 19, exuvia (reared) ; Fighting 
Creek (branch of Little Pigeon River), May 
27, 1934, T. H. Frison, 4 nymphs; Le Conte 
Creek, June 13, 1938, ‘IT. H. Frison & T. H. 
Frison, Jr., 1 exuvia; Le Conte Creek, June 
16195 0gely la enone ce ba AH: Frison, Jr., 
