276 
Since the records and descriptions in 
existing literature in most, if not all, cases 
represent mixed series when pennsylvanica 
is referred to, I believe the best interests 
of nomenclature and taxonomy in this in- 
stance are served by considering the species 
of Acroneuria involved as a new species 
and by not merely proposing a new name. 
Mate.—General habitus the same as 
for other species of Acroneuria from 
North America. Dorsum of head yellow 
Fig. 42—Nymph of Acroneuria filicis. 
ItLinois NATURAL History SURVEY BULLETIN 
Vol. 22, Art. 
with a pattern of dark brown markings 
as in fig. 41. Pronotum brown with raised 
rugosities and a longitudinal, median de- 
pressed line, this line not lighter colored 
as in some other species. “lerminal ab- 
dominal tergites with groups or patches of 
small spinulae arranged as in fig. 41. 
Genital hooks or modified subanal lobes 
tapering to a point and slightly curved in- 
wards at tip. Subanal lobes show gill rem- 
nants. 
FEMALE.—Head, thorax, basal abdom- 
inal segments and appendages in general 
similar to those of male but slightly larger 
in size. Important differences are as fol- 
lows: eighth abdominal sternite modified 
into a subgenital plate slightly extending 
over ninth sternite and with posterior mar- 
gin rounded as in fig. 41. 
Holotype, female.—Pineville, Ky.: at light, 
June 24, 1938, T. H. Frison & T. H. Frison, 
je 
Allotype, male.—Same data as for holotype. 
Paratypes. — KENTUCKY.—PINEVILLE: Same 
data as for holotype and allotype, 124, 469. 
CUMBERLAND Fats: June 12, 1940, T. H. 
Frison et al., 19. 
TENNESSEE. — Chimneys Camp Grounds, 
Great Smoky Mountains NATIONAL PARK, 
2,900 feet elevation: Aug. 4, 1939, Rehn & 
Rehn, 24, 323; July 9, 1939, at light, Ame. 
Cole, 22 ; July 12, 1939, A. C. Cole; 29 Gae- 
LINBURG: June 18, 1940, reared from nymph, 
T. H. Frison et al.,1é. 
Ou10.—ATHENS or ATHENS County: April 
25, 1931, W. C. Stehr, 19 ; June 14, 1938, W. 
C. Stehr, 1¢ ; June 11-27, 1939, W. C. Stehr, 
24, 42; June 20-22, 1941, W. C. Stehr, 56, 
29; June 21-July 6, 1941, at light, J. Walker, 
+ 
I am naming this new species in honor 
of my son, T. H. Frison, Jr., who has 
accompanied me on many collecting trips 
for aquatic insects in various parts of the 
country and who assisted me in the collec- 
tion of the material from Pineville. 
Nympu.—A brief description of the 
more important characters of the hereto- 
fore unknown nymph is as follows: Body 
and appendages pale yellowish brown with 
a very distinct pattern of dark brown or 
dusky markings on dorsum, fig. 42; W- 
shaped, pale yellowish mark anterior to 
median ocellus is broad throughout and 
dark pattern tends to fill space between 
lateral ocelli and inner margins of com- 
pound eyes; abdominal tergites dominant- 
ly dark brown or dusky with pale yel- 
lowish on posterior margins, the yellowish 
part expanding along median line and of 
some segments tending to be segregated t¢ 
