330 Intinoris NaruraL History SurRVEY BULLETIN 
Fig. 107—Nymph of Isoperla slossonae. 
Mature specimens with body length, ex- 
clusive of appendages, up to 14 mm. 
No gills present. 
New records for this species based upon 
specimens submitted for identification and Illi- 
nois Natural History Survey collecting are as 
follows. 
MAINE.—DousLe Tor Mountain, Sourdna- 
hunks River: plug 227751939, 0). Hee rison & 
oH. Frison, Jr 92 7exuviae. 
MICHIGAN.—BALDWIN, Pere Marquette Riv- 
er: May 28, 1939, Frison & Ross, 2 OV ee CRU 
ivae; May 9-10, 1940, Frison & Rossy 3.05 
99, 1 nymph, exuviae, 29 with exuviae 
(reared). CRAWFORD COUNTY, Au Sable River: 
Bebie2 37 h936smicuy.. Leonard, 1 nymph. Near 
LovELLs: March 23, 1936, J. W. Leonard, 10 
nymphs. Fire LAKE, near Canada Creek: Oct., 
1935, 5 nymphs. GRAND ‘TRAVERSE CouNTY, 
Boardman River, 3 miles above Traverse City 
Power Company dam, T. 26N., R. 9W., Sec. 
WS Mlaye fan 93550 Jay Leonard, 86, 69. 
GrayLinc, Manistee River: May 22, 1936, 
Frison & Ross, 59. Honor, Platte River: May 
Vol. 22, Art 
27, 1939, Frison & Ross, 4 exuviae; May 10, 
1940, Frison & Ross, 6 é, 69, 2 nymphs, 6 
exuviae. KLACKING CREEK, northwest branch: 
Oct. 14, 1935, 5 nymphs. LAKE County: middle 
branch of Pere Marquette River, south of 
Nirvana, Nov. 5, 1936, J. W. Leonard, 4 
nymphs; Pine River, Walker Bridge Camp, 
May 29, 1938, J. W. Leonard, 19 ; Pine River, 
Walker Bridge Camp, May 30, 1938, OO. 
Clark, 1¢. Lewisron, Hunt Creek: Oct. 28, 
1935, 7 nymphs. LOvELLS, Au Sable River: 
May 22, 1936, Frison & Ross, 4¢, 29, 2 exu- 
viae. Near LovELLs, north branch of Au Sable 
River: May 24, 1936, J. W. Leonard, 29. 
Oscopa County, Perry Creek: Oct. 29, 1936, 
J. W. Leonard, 2 nymphs. PEACOCK, Little 
Manistee River: Oct. 1935, 4 nymphs; Oct. 
24, 1935, 2 nymphs; May 10, 1940, Frison & 
Ross, 29, 2 nymphs, exuviae. Rose CITY, 
Houghton Creek: Oct. 15, 1936, 6 nymphs. 
WOLVERINE, Maple River: Sept. and “Ocr 
1935, 2 nymphs. 
MINNESOTA. — BLooMINGTON, Nine Mile 
Creek: March 31, 1935, L.  L. 9 Smittniies 
nymphs; April 5, 1935, L.. L.. Smith, 1 See 
exuvia; April 9, 1935, L. L. Smith; 23 
(reared) ; April 10, 1935, L. L. Smitha 
and 1@ (reared); April 13, 1935, L. L. Smith; 
29 (reared); April 14, 1935, L. L. Smith, 
1@, 3 nymphs. Coon CREEK: April 20, 1935, 
H. B. Welshonse, 1 nymph. HENNEPIN Coun- 
ry: Nine Mile Creek, May 5, 1933, Cl 
Mickel, 12 ; May 2, 1936, C. E. Mickel, 29 ; 
May 1, 1937, Redu Toit, 1¢,\1.2 7 Mia 
1937, H. S. Telford, 19 ; May 3, 1937, Mo i 
enw oe 
New HampsuirE. — Glen House, Mount 
WasHINCTON: June 22, 1941, T. H. Frison & 
H. H. Ross, 1 @ (compared with type of 
slossonae in M.C.Z.). 
Nova ScOTIA.—SPRINGHILL JUNCTION: Aug. 
21, 1939, T. H. Frison & T. H. Frison, Jr 
1 exuvia. 
WISCONSIN.—BOULDER JUNCTION: April 9, 
1937, Frison & Mohr, 19 nymph; April 29, 
1937, Frison & Mohr, 14 (reared) ; May 10, 
1937, Frison & Mohr, 19 (reared). 
Isoperla marlynia Needham & Claassen 
Isoperla marlynia Needham & Claassen 
(1925, p. 148). Original description, ¢, @.- 
Chloroperla montana Banks (1898, Pp. 199). 
In part, ¢ paratypic specimen. 
Isoperla clio Needham & Claassen 
p39). la part, misidentification. 
Isoperla clio Claassen (1931, p. 69). Erro- 
neous nymphal association. 
Isoperla clio Frison (1935a, Pp. 439). Nymph. 
Numerous rearings of North American 
species of Isoperla have revealed consider- 
able confusion in identification of species 
under the specific names of clio ( New- 
man), marlynia Needham & Claassen and 
confusa Frison. In the first place, there 
is very great uncertainty in regard to 
which North American species the name 
clio applies. Until this uncertainty 1S 
(1925, 
