September, 1942 
exuviae. GREAT SMOKY MounrTAINS NATION- 
AL PARK, Greenbrier Cove: March 18, 1939, 
pw Coley 15% 
VIRGINIA.—ELkTON, Elk River: Jan. 1, 1939. 
Frison & Burks, 1 nymph. Farts CHurcw: 
4-22 (collection of N. Banks), 19. Great 
FALLs: Potomac River, March 26, 9S Seu be 
D. Burks, 13; Potomac River, April 3, LOSS 
Bog 2. Burks41.9', 2 exuviae; April 10, 1938, 
B. D. Burks, 2 exuviae. Lyp1a: April 20, 1938, 
Ross & Burks, 24, 1 exuvia. SHENANDOAH Na- 
TIONAL PARK, Big Meadows: April 20, 1938, 
Ross & Burks, nymphs; April 30, 1940s 
Frison et al.. 8 with exuvia (reared). Sky- 
line Drive, south of Front RoyaL: March 17, 
1940, T. H. Frison ef al.. 2 nymphs. SrTanp- 
ARDSVILLE: March 21, 1940, Frison, Mohr & 
Hawkins, 2 nymphs. 
Isoperla namata new species 
MAave.—General color in life bright 
yellow with dusky or fuscous areas. Dor- 
sum of head yellow with dark or dusky 
markings as follows: a V-shaped mark 
connecting median and lateral ocelli, por- 
tion of head anterior to median ocellus 
and several patches on posterior margin 
of head behind eyes, fig. 104. Pronotum 
with a broad, median, longitudinal, yel- 
low stripe somewhat constricted in the 
middle, and with fuscous raised rugosities 
each side of stripe, fig. 104. Mesonotum 
and metanotum with medial and posterior 
portions yellow and remainder of dorsum 
and most of sides dark brown or fuscous. 
Abdomen on dorsum with a narrow, dark, 
median, longitudinal stripe and a broader, 
dark, longitudinal stripe on each lateral 
margin extending to about the ninth ter- 
gite, the ninth and tenth tergites mostly 
yellow. Legs with trochanters, coxae and 
tips of femora yellow, tibiae and most of 
femora dark or fuscous. Antennae and 
anal cerci with all segments black. In 
specimens which have been preserved in 
fluid, the bright yellow color tends to be- 
come cream colored and the fuscous or 
dark areas tend to become dark brown. 
Head slightly wider through compound 
eyes than width of pronotum; lateral ocelli 
farther distant from one another than each 
is distant from median ocellus; distance 
between compound eye and lateral ocellus 
about the same as between lateral ocellus 
and median ocellus. 
Pronotum approximately quadrangular, 
broader than long, a distinct pattern of 
raised rugosities on surface each side of 
yellow, median, longitudinal stripe, fig. 
104, 
Frison: Nore AMERICAN PLECOPTERA 
2 
MANDIBLES 
NyMPHAL 
NyMPHAL 
MAXILLA 
NYMPHAL 
LABIUM 
oT ERMINAL 
ABDOMINAL 
TERGITES 
? TERMINAL ABDOMINAL 
TERGITES 
o' TERMINAL ABDOMINAL 
STERNITES 
3& HEAD AND 
PRonotum 
Fig. 104.—Isoperla namata. 
$ SUBGENITAL Ptate 
Abdomen, fig. 104, with tenth tergite 
not cleft; subanal lobes weakly developed 
into short finger-like processes: ninth ster- 
nite, fig. 104, produced backwards so that 
