September, 1942 
Banks have these anal gills in the nymphs 
or anal gill remnants in the adults. 
Needham & Claassen in the original 
description state that the males of theo- 
dora are “‘brachyterous,” but give measure- 
ments of “length to tip of wings” for the 
males as “29-32 mm.,” and “expanse 48— 
50 mm.” In their Monograph of a tew 
years later, 1925, the “length to tip of 
wings” of the male is given as “15 mm.,” 
and the “expanse—20 mm.” Evidently the 
males vary from short-winged to long- 
winged forms. Two male specimens in the 
Illinois Natural History Survey collec- 
tion from Wyoming have actual wing 
lengths of 15 and 20 mm., and male speci- 
mens from Oregon have wings as long 
as 28 mm. Wing lengths are poor criteria 
for separation of species in Plecoptera. 
ee 
ADULT HEAD 
AND PRONOTUM 
AEDEAGUS 
LATERAL 
VIEW 
AEDEAGUS 
DORSAL VIEW 
Tht } Uj ‘ 
Ds AW Spee send | 
J ih 1 vii whist 1 
ME) i Ah 
Vay \ \\t iM 
a) "i Whit vA \ 
I 
IS ABDOMINAL STERNITES 
Gi 
WAN 
, Vay yh 
CHAM 
Fig. 52.—Acroneuria theodora. 
Frison: NortH AMERICAN PLECOPTERA 285 
Illinois Natural History Survey collection 
records for theodora are as follows. 
CALIFORNIA.—Mopoc County: July 20; 1922) 
UG. 
OREGON.—MCcKENZIE RIVER: south fork, 20 
miles south from confluence, Sept. 4, 1932, R. 
Dimick, 1¢; Sept. 21, 1934, Ree Dimick, .9igs 
82, 36 exuviae, 89 exuviae. Camp Creek, 
Mount Hoop NaTIonaL Forest: P21 933, 
R. Dimick, 12 nymph. McKENZIE BRIDGE: 
Sept. 21, 1934, R. Dimick, 546,59, 39 exuviae. 
East Fork River, WILLAMETTE NATIONAL For- 
EST peptn 6, 1936)8V, EeeStorr, 14. Boyer, 
foot-log on Salmon River: Sept, 221935 faeA, 
Macnab, 16. McMINNVILLE: Sept 716./1933; 
J. A. Macnab, 18. Summir Prarie, July 23, 
E939 G 
WYoMING.—Shell Exit, Bic Horn Moun- 
TAINS. = Fuly 30,1940 © 1 Hor. & 1H. Pe) i: 
1. Bondi Camp, Bic Horn NaTIONAL FOREST, 
louguemRiver:> fuly928.01940, > H. Fog. 
eae Ty ee 
Acroneuria sabulosa (Banks) 
Perla sabulosa Banks (1900, p. 242). Orig- 
inal description, 9°. 
Acroneuria depressa Needham & Claassen 
(1922, p. 253). Original description, ¢, 9. 
New synonymy. 
Perla sabulosa Needham & Claassen 1925, 
p. 101). New synonymy. 
By permission of Dr. Nathan Banks, I 
have had the privilege of studying criti- 
cally the typic female, No. 11,317, of 
sabulosa and the holotype and allotype, 
No. 15,520, of depressa in the collection 
of the Museum of Comparative Zoology. 
In order to study the typic female of 
sabulosa- and a paratypic female of de- 
pressa in fluid, I relaxed the specimens 
and slightly softened the apical abdomi- 
nal segments with potassium hydroxide. 
Both were found to be a species of Acro- 
neurta which reveal traces or remnants of 
gills on the subanal lobes and hence must 
have nymphs with anal gills. No tangible 
differences were found to exist between 
the specimens; therefore, and because of 
priority of description, the specific name 
of depressa must fall into the synonymy 
of sabulosa. 
It is interesting to note that the typic 
specimen of sabulosa came from “Yakima, 
Wash.,” and the typic series of depressa 
came from “Yakima River, Lone Tree, 
June 3050/82) Woe [= Wash.) 
Under Claassenia arctica (Klapalek) in 
this article I have pointed out that Claas- 
sen (1931) erroneously described and il- 
lustrated the nymph of arctica under the 
name of Acroneuria depressa. The nymph 
