September, 1942 
definitely eliminated by a restudy of the 
typic specimens, and they are carefully 
compared with all North American spe- 
cies of Isoperla likely to be the true clio, 
the use of this specific name means con- 
tinual confusion, | plan to follow the 
course, therefore, of not using the name 
clio for the time being. Ricker’s recent 
comments regarding the typic specimens 
of clio do not clear up the points at issue; 
the specimens he accepts as types in the 
British Museum are stated to be from 
“Canada,” whereas, the original descrip- 
tion is based upon material which “in- 
habits Georgia.” Newman’s clio may 
Prove to be marlynia, confusa or some 
other species. 
Through the kindness of Dr. Henry 
Dietrich of Cornell University, I have had 
the privilege of studying all material de- 
termined by Needham & Claassen, or 
Claassen, as clio and also the typic series 
of marlynia. I find that some of the adults 
recorded as clio belong to the species which 
I have reared and described as confusa 
(1935a), and some are identical with 
marlynia, as follows: 2 male and 1 female 
adults from “Raleigh, N, oViarch 222. 
1707, are confusa, and 1 female adult 
from “Elkhart, Ind., June 18, 1902,” and 
the nymph from “Elkhart, Ind., April,” 
figured by Claassen (1931) are marlynia. 
In the Museum of Comparative Zo- 
ology there are two specimens belonging 
to the typic series, No. 11,339, of Chloro- 
perla (= Isoperla) montana Banks. One 
of these specimens, from “Mt. Wash’n,”’ 
I relaxed and placed in alcohol when [| 
studied it in 1939; Dr. Nathan Banks 
has recently informed me that it has been 
marked “type:”’ The second specimen, 
from ‘‘Franconia, N. H.,” is a pinned 
specimen of another species and has been 
marked as “paratype.” This paratypic 
specimen, which I studied in 1941, proves 
to be of the same species as marlynia but 
montana does not fall in synonymy be- 
cause the “type” specimen is another spe- 
cies of Isoperla for which the name mon- 
tana 1s available. The original description 
ot montana does not refer to a “type” and 
a “paratype,” but the specimens are now 
so marked by Dr. Banks. It is fortunate 
from a nomenclatorial standpoint that the 
“type” specimen is the “Mt. Wash’n” 
specimen now in alcohol. Specimens of 
Isoperla montana considered by Needham 
Frison: Norri AMERICAN PLECOPTERA 
ao 
& Claassen (1925) are, at least in part, 
of the same species as the specimen now in 
alcohol and labeled as “type.” I. montana 
has a much lighter colored head pattern 
than marlynia. 
‘The rearing of numerous specimens of 
adults of marlynia from nymphs collected 
in Indiana and Michigan has revealed 
that the nymph described by Claassen 
(1931) as clio is in reality marlynia. As 
NYMPHAL MANDIBLES 
NYMPHAL MAXILLA NYMPHAL LABIUM 
SESS 
iw) 
G'ABDOMINAL STERNITES 
CO ABDOMINAL TERGITES 
G' ABDOMINAL TERGITES 
Fig. 108.—IJsoperla marlynia. 
