| September, 1942 Frison: NortH AMERICAN PLECOPTERA 251 
lobes, one on each side, on the posterior 
_margin of the ninth abdominal tergite in 
- the males, fig. 9; in some males these lobes 
are present, whereas in many specimens 
_ they are lacking or relatively undeveloped, 
fig. 10. The subanal lobes of this species 
are asymmetrical, and in spite of their 
complexity I have failed to find marked 
differences in kind between these struc- 
tures in males with and in males without 
the lobes on the ninth abdominal tergites, 
figs. 9 and 10. This latter fact, plus fail- 
ure to find differences in the females and 
nymphs, has influenced my evaluation of 
the absence or presence of these lobes on 
ninth abdominal tergite as a non-specific 
character. 
Brachyptera glacialis (Newman) 
Nemoura (Brachyptera) glacialis Newman 
(1851, p. 451). Original description, ¢, 9. 
Taeniopteryx (Oemopteryx) alex Hanson 
(1938, p. 79). New synonymy. 
Taeniopteryx glacialis Ricker Glos Gab: 
131). Notes regarding types. 
In the collection of the Museum of 
Comparative Zoology, there is a male of 
glacialis from “Hudson’s Bay” which is 
undoubtedly the typic male specimen men- 
tioned by Ricker (1938) as having “‘been 
sent to the Museum of Comparative Zo- 
ology.” Ricker (1938) selected lectotypic 
and lecto-allotypic specimens from the 
series of two male and three female types 
now in the British Museum. This species 
was entirely omitted by Needham & Claas- 
sen (1925) in their Monograph. 
I have studied in fluid the genitalic 
structures of the typic male in the Mu- 
seum of Comparative Zoology, paratypic 
specimens of Taeniopteryx (Oemopteryx) 
alex and other specimens, and as a result 
| have come to the conclusion that alex 
is a synonym of glacialis. I can find no 
definite characters to separate them, and 
any differences observed can be ascribed 
tO variation. 
Hanson described alex from specimens col- 
lected at Wells, Hamilton CountyeeNo ey) 
Records or specimens in the LIlinois Natural 
History Survey collection or specimens I have 
letermined for others are as follows. 
CONNECTICUT.— DANIELSON: March 24, 1937, 
H. H. Ross, 5a 4.9: 
MINNEsoTa.—LAKE County, Stewart River: 
March 26, 1938, R. H. Daggy & W. S. Chal- 
em, 5S. 
eg Myton: March 16-19, 1940, R.A.Z., 
id, 59. 
Brachyptera oregonensis 
(Needham & Claassen ) 
Taeniopteryx oregonensis Needham & Claas: 
sen (1925, p. 248). Original description, @. 
This species was originally described 
from males only, collected at Corvallis, 
Ore. Since the female has not been pre- 
viously described it seems desirable here to 
Bisel] 
Brachyptera 
oregonensis. 
Q ABDOMINAL STERNITES 
illustrate the important features of the 
terminal abdominal sternites of a female, 
fig. 11, based upon a specimen collected 
at Dixon Creek, Corvallis, Ore., March 
WOeLI935 cbyeReiss Dimick” Since allhoticr 
characters are approximately the same as 
those in the male, this illustration show- 
ing the shape of the subgenital plate will 
suffice for a description of this sex, and the 
specimen is designated at the allotype. 
A large number of specimens of oregonensis 
are now in the Illinois Natural History Survey 
collection, and I have determined many speci- 
mens for others. These records are too numetr- 
ous to be given in detail here but come from 
the following localities in Oregon: Benton 
County, Canyonville, Clackamas County, Clat- 
skanie, Clatsop County, Columbia County, Cor- 
vallis, Crabtree, Forest Grove, Hillsboro, Leb- 
anon, Lewisburg, Oak Creek, Philomath, Polk 
County, Portland, Salem, Seaside, Warren and 
Wren. 
Brachyptera pacifica (Banks ) 
Taeniopteryx pacifica Banks (1900, p. 244). 
Original description, ¢, 9. 
Taeniopteryx raynoria Frison (1942, p. 9). 
Recent synonymy. 
Taeniopteryx kincaidi Frison (19425. 9). 
Recent synonymy. 
In a recent publication (1942), I treat- 
ed raynoria Claassen (19375) and kin- 
caidi Hoppe (1938) as synonyms of pacifi- 
ca. Additional comments regarding the 
types involved and the synonymy adopted 
are herewith presented, 
