September, 1942 
weed. 14, 1938, Frison & Mohr, 62, 49. 
SPRINGVILLE: Feb. 14, 1938, Frison & Mohr, 
-66, 29. Turkey Run Strate Park: March 
18, 1933, Frison & Mohr, 19; Sugar Creek, 
April 19, 1933, Frison & Mohr, 29. Wittow 
VaLLey: March 14, 1936, Frison & Ross, 8 é, 
ee . 
_ KENTUCKY.—TRENTON: Jan. 5, 1939, Frison 
& Burks, $4, 69. 
MARYLAND. — EMMITSBURG: Feb. 14 eS 
84,32. INDIAN Sprincs: Feb. 2, 1936, Frison 
& Ross, 12, 39. 
New York.—ITHAca: March 15, 1922, 22, 
22; Beebe Lake, March 18, 1935, 19. NortTH 
Cottins: April 13, 1937, H. H. Ross, 12. 
OuHI0.—LiTTLE Hockinc, White Run Creek: 
March 16, 1940, T. H. Frison et al., aOR lie 
NEw Concorp: Jan. 6, boo Ela ROSS;3G55) 
Se 
PENNSYLVANIA.—AMITY HALL, on Route U. 
sez; Feb. 17, 1938, R. E. Meattere Grants 
CLAYSVILLE, 5 miles east on U. S. 40: Feb. 13; 
1938, R. E. Yeatter, 19. EMERICKVILLE, 114 
miles east of town: Feb. 18, 1938, R. E. Yeat- 
ter, dd, 99. Grampian, Kratzer Run: Feb. 
18, 1938, R. E. Yeatter, 1¢. NorTHUMBER- 
LAND: March 23, 1937, H. H. Ross, 6 6, 49. 
Van, East Sandy Creek: Feb. 18, 1938, R. E. 
Meatter, 62, 99. 
TENNESSEE.—BRISTOL: Jan. 2, 1939, Frison 
& Burks, 1¢. GoopLetrsvinLe: Jan. oan 1 939. 
Frison & Burks, 1¢, 19. JoHNson City: Jan. 
2, 1939, Frison & Burks, $ 6,492. McDonatp: 
Jan. 4, 1939, Frison & Burks, 3 Op pk San Zomat= 
ing pairs. SPRINGFIELD, Sulphur Fork Creek: 
Jan. 5, 1939, Frison & Burks, 2 4, 29. 
VIRGINIAA—AFTON: March 22, 1940, Frison, 
Mohr & Hawkins, ¢ 6, 29. BuLL Run, Bull 
Run Creek: March 21, 1940, Frison, Mohr & 
Hawkins, 16. Ceparvitte: March 17, 1940, 
WH. Frison ef al. 32. CULPEPER, Gaines 
Run Creek: March 21, 1940, Frison, Mohr 
& Hawkins, MO pela? 3 ELKTON. (Elk: “Run: 
March 21, 1940, Frison, Mohr & Hawkins, 
646, 39. Ettiston, Roanoke River: Jans 2, 
1939, Frison & Burks, 16, 19. FArrFAX: Jan. 
fee s0,, 1. H. Frison, 26; Dec. 31, 1938, 
Frison & Burks, 3 mating pairs; March 21, 
1940, Frison, Mohr & Hawkins, 14. Fam- 
FIELD: Jan. 1, 1939, Frison & Burks, 3 2, 
22. Fort CuisweLt: Jan. 2, 1939, Frison & 
Burks, 16, 19. Gore: March 94.0 Le 
Mmerrison ef al. 94, 49, 3 mating pairs. 
GREENVILLE, Christian Creek: ane 61939: 
Frison & Burks, 3 @, 1 mating pair. GRror- 
POEs, Mill Creek: Jan. 1, 1939, Frison & Burks, 
66, 29, 6 mating pairs. HunTER: Jan. 30, 
1938, Gurney & Burks, 94, 29. Marion, Hol- 
ston River: Jan. 2, 1939, Frison & Burks, 19. 
PorT REPUBLIC: North River,ee) an.pa141939) 
Frison & Burks, 23, 12; March 21, 1940, 
Frison, Mohr & Hawkins, ¢ 4, 1 9, 1 mating 
air. RapForp: Plum Creek, Jan. -2, 1939, 
frison & Burks, $8, 69, 1 mating pair; 
March 22, 1940, Frison, Mohr & Hawkins, 3°. 
RIVERTON: March 17, 1940, T. H. Frison et al., 
*d, 12. Roanoke, Mud Lick Creek: Jan. Dy 
1939, Frison & Burks, 29. SHAWSVILLE: Jan. 
» 1939, Frison & Burks, 32. VIENNA, Indian 
Run Creek: Feb. 13, 1938, B. D. Burks, ¢ ¢, 
2. WARRENTON: March 21, 1940, Frison, 
Mohr & Hawkins, 3, 29. WINCHESTER, 
Frison: NortH AMERICAN PLECOPTERA 
271 
Hogue Creek: March 17, 1940, T. H. Frison 
et al.. 48, 19, 1 mating pair. 
WEsT VIRGINIA. — EVANSVILLE: March 16, 
1740 LHS Frison vet al. 4 8,.40. Prunry- 
TOWN: March 16, 1940, T. H. Frison et be 
16. SHAFFENAKER: March 17, 1940, T. H. 
Frison et al, 18. SmiruHpurc: March 16, 
tT el ei rison ¢? als, 26). VOLCANO: 
March 16, 1940, T. H. Frison et Me ers Seo AS Sp 
PERLIDAE 
Perlesta placida (Hagen) 
Perla placida Hagen (1861, p. 28). Orig- 
inal description, ¢, @. 
Perlesta placida is one of the most 
widely distributed species of stoneflies in 
North America, and large series of speci- 
mens from various localities reveal con- 
siderable variation. It is not my inten- 
tion to go into detail in this paper con- 
§ 
i 
if 
Bs 
¢ 
“hs 
~ ae a Se 
5 85 
Fig. 37—Nymph of Perlesta placida. 
