September, 1942 
a mating pair. Romry: March a7 1940 eels 
Prison et al. 36, 39. IAEGER, Horse Creek: 
Feb. 2, 1936, J. Addair, 14. 
MARYLAND.—GRANTSVILLE, Shade Run: Feb. 
£5,, 1938, R. E. Yeatter, 124. 
This species is easily distinguished from 
all other species of Allocapnia. The males, 
in having a tubercle on the seventh ab- 
dominal tergite, suggest forbesi Frison and 
ulinoensis Frison, but the shape and gen- 
eral arrangement of all tubercles is quite 
different. The females are unique be- 
cause of the pronounced lobelike projec- 
tion of the posterior margin of the seventh 
sternite. “he seventh and eighth sternites 
are slightly fused beneath the lobelike pro- 
jection of the seventh sternite, but this at- 
tachment is readily broken so that a mem- 
branous transverse strip may seem to be 
present between these sternites beneath the 
lobe. 
Allocapnia virginiana new species 
Mate.—Similar in general features to 
curiosa Frison. Differs from this and 
other species of the genus as follows. Ab- 
domen with first seven tergites without 
tubercles, a narrow, median, pale, longi- 
tudinal, membranous-like stripe on first 
four basal tergites; eighth terpite; fig. 35. 
with a large, odd-shaped, robust tubercle 
which in turn has a small, pointed tubercle 
yn anterior face or margin; recurved 
upra-anal process very short, broad and 
shaped as in fig. 35; ninth and tenth ter- 
rites broadly cleft for reception of supra- 
inal process. 
FEMALE.—Similar in most morphologi- 
al features to the male. Wings extending 
0 tip of abdomen; a wide, median, dorsal, 
ongitudinal stripe extending from base of 
bdomen to hind margin of eighth tergite, 
ast two tergites entirely and darkly scle- 
otized; seventh abdominal sternite simi- 
ar to those preceding; eighth abdominal 
ternite with a darkly sclerotized subgeni- 
al plate shaped as in fig. 35, 
Holotype, male. — Shelby, Rapidan River, 
‘a: Jan. 1, 1939, T. H. Frison & B. D. Burks. 
Allotype, female—Same data as for holo- 
"pe. 
Paratypes.—VIRGINIA.— SHELBY: Same data 
s for holotype, 26, 49. Mapison: Jan: 1, 
¥a?, IT. H. Frison & B. D. Barks iora6, 9 
EMINGTON, Rappahannock River: Dec. onl 
#25, |. H. Frison & B. D. Burks) 214 42:0" 
The shape of the supra-anal process and 
Tuctures on the eighth abdominal tergite 
Frison: NorrH AMERICAN PLECOPTERA 
269 
separate the male of this species from 
males of all other known species of 4/Jlo- 
capnia. The female of this new species 
o TERMINAL ABDOMINAL 
SEGMENTS 
Laie a 
POSTERIOR KNOB ANTERIOR KNOB 
EIGHRHGMeERGITE DoRSAL 
SUPRA-ANAL 
PROCESS 
aX 
VENTRAL 
9 SUBGENITAL SUPRA-ANAL 
PLATE Process 
Fig. 35.—Allocapnia virginiana. 
belongs to the group of species having 
only the last two dorsal abdominal tergites 
darkly sclerotized and with a pale, mem- 
branous, transverse stripe between the sev- 
enth and eighth abdominal sternites; it 
differs, however, in shape of subgenital 
plate. The male and female are associ- 
ated on the basis of their collection to- 
gether at the same time at three different 
localities. 
Allocapnia rickeri new species 
Allocapnia pygmaea Frison (1929, p. 396). 
Misidentification. 
Allocapnia pygmaea Frison C1935." 054367). 
Misidentification. 
As mentioned in the discussion under: 
pygmaea (Burmeister), certain Illinois 
specimens of Allocapnia once recorded by 
me (1929 and 1935a) as pygmaea, and 
also many similar specimens in the TIIli- 
nois Natural History Survey collection 
from other localities, require a new spe- 
cific name. I propose, therefore, for this 
species of Allocapnia the name of rickeri 
in honor of Dr. William E, Ricker, who 
