September, 1942 
with pattern of dark brown markings as 
in fig. 39. Pronotum with raised rugosi- 
ties and a narrow, yellow, longitudinal 
median line. Terminal abdominal tergites 
with groups of small spinulae arranged as 
¢ 
5 PE ORES, . 
$000 7 Nn ee 
BSC eeN ee se: 
Wf 
Wh 
? pee 
ie 
i 
rh 
My , 
GABDOMINAL STERNITES 
Fig. 39.—Acroneuria arida. 
in fig. 39, Genital hooks or modified sub- 
anal lobes of the finger-like type with a 
distinct notch on inner margin at tip. 
Ninth sternite with a small, nearly round, 
padlike disk. Subanal lobes show no trace 
of gill remnants. 
Allotype, male—Knoxville, Tenn.: June 21, 
1939, A. C. Cole. 
The subgenital plate of the female of 
arida was figured by Banks at the time 
of the original description of valida, but 
to aid recognition of this species another 
illustration of this structure, fig. So is 
presented. 
The nymph of this species has not as yet 
been discovered. 
In addition to the records from North Caro- 
lina and Philadelphia (Pennsylvania) given in 
the original descriptions, I can now add the 
following. 
GEORGIA.—SUMMERVILLE: June ep a a aoe 
WeePattis, 52, 79. RINGGOLD, Chickamauga 
Creek: June 14, 1939, P. W. Fattig, 56, 69. 
Batt Grounp: June 27, ise, Pe Wark attio, 
12. EvLavitte, Cedar Creek, 10.7 miles north: 
May 26, 1939, P. W. Fattig, 29. 
TENNESSEE.—KNOXVILLE: April 24, 1936, C. 
B. Huffaker, 19 ; May 26, 1936, Co bes Hut. 
faker, 12 ; June 1, 1936, D. A. Johnson, 12 ; 
Frison: NortH AMERICAN PLECOPTERA ile: 
Pew G21 936.2: 1) A. Johnson, 18; May 22) 
1939, A. C. Cole, 22; June 14, 1939, A. C 
Cole, 12 ; June 21, 1939, A. C. Cole, 26, 49. 
SEVIERVILLE: June 11, 1938, at light, T. H. 
Frison & T. H. Frison, Jr., 19. GREENBRIER 
Cove, Smoky Mountains: June-July, 1940, A. 
C. Cole, 18,192. Monreacte: aren Richards, 
gee 
Acroneuria evoluta Klapalek 
Acroneuria evoluta Klapalek (1909 p.1245). 
Original description, ?. 
Larva No. 1—Garman (1912 5p. 59; fig.147). 
Nymphal description. 
Acroneuria arida Needham 
(1925, p. 185). In part. 
Acroneuria evoluta Clark (1934 Sel? te), 
Acroneuria arida Frison (1935a, p. 395). 
Misidentification. 
Acroneuria prolonga Claassen O19 37 OD: 
42). New synonymy. 
Acroneuria evoluta Ricker (1 38am pe 2158) 
Notes on type. 
Acroneuria arida Claassen C94 0M pat 72). 
Catalogue—in part. 
& Claassen 
In my remarks concerning the synonymy 
of arida (Hagen), I have called attention 
to the fact that Needham & Claassen 
(1925) confused two species under the 
name of arida. One of these species, arida 
(Hagen) — valida (Banks), lacks gill 
remnants on the subanal lobes of the 
adults and hence has nymphs lacking anal 
abdominal gills. The second of these spe- 
cies has anal abdominal gills in the nymphs 
and shows gill remnants on the subanal 
lobes of the adults (evoluta = arida as 
used in the sense of Frison 1935a). 
Due to the confusion of species in liter- 
ature at the time of publication of my 
1935a paper, the Illinois records of arida 
reported by me at that time apply to the 
species here called evoluta. It is obvious 
from this situation that my placement then 
of evoluta as a synonym of arida does not 
hold, and evoluta becomes available as the 
name for this Illinois (1935a) material. 
Ricker’s (1938) notes on the type of 
evoluta are the basis for my use now of 
the name evoluta for the Illinois material 
recorded (1935a) as arida. Ricker states 
that his study of evoluta “indicates that it 
1s synonymous with arida Hagen, as earlier 
suggested by Frison.” It should be pointed 
out that at the time of Ricker’s article the 
arida in the sense of Frison is not equiva- 
lent to the true arida (Hagen) but to a 
species for which the first name available 
now appears to be evoluta. 
In 1937, I adopted the use of the name 
