284 
Neave’s (1933) description of the 
nymph of perbranchiata is a very good one 
and since it is identical with /ycorias there 
is little need here for many further re- 
marks. Neave did not figure the nymph, 
NYMPHAL 
MANDIBLES 
NYMPHAL 
MAXILLA 
ied A hy 
ADULT HEAD 
9 SUBGENITAL PLATE FF 
Figs: ol 
Acroneuria 
lycorias. 
however, and since Claassen’s figure is in 
error as to species I believe it well to in- 
clude here an illustration of the nymph. 
The most important features of this 
nymph are the color pattern, fig. 50, and 
the presence of the anal abdominal gills. 
The maxilla, labium and mandibles are 
aS inige), le 
Since the adults of lycorias have been 
confused with those of other species, I am 
presenting here illustrations of the color 
pattern of the dorsum of head and pro- 
notum, fig. 51, the subgenital plate of 
ItLinotis NATURAL History SURVEY BULLETIN 
Vol. 22, Arta 
the female, fig. 51, and the dorsal apical 
segments of the male, all based upon 
reared material. Klapalek’s (1909) figure 
of the subgenital plate of the female of 
lycorias does not agree with my figure, but 
Ricker has fixed a lectotype for /ycorias 
which is similar to the illustration of 
Needham & Claassen (1925) and this is 
comparable to my material. Very likely 
Klapalek’s material, at least in part, repre- 
sents some other species. 
In addition to reared male and female speci- 
mens obtained on Illinois Natural History 
Survey field trips to Michigan, Tennessee and 
Wisconsin, I have studied reared material 
from Minnesota sent to me for identification. 
A large series of adults and nymphs of this 
species in the Survey collection are from 
Florida, Maine, Manitoba, Maryland, Massa- 
chusetts, Michigan, Minnesota, New York, 
Ohio, Ontario, Pennsylvania, Tennessee and 
Wisconsin. 
Acroneuria theodora 
Needham & Claassen 
Acroneuria theodora Needham & Claassen 
(1922, p. 254). Original description, ¢, 9%. 
Acroneuria theodora Claassen (1931, p. 90). 
Nymph. 
This species has not been recorded in 
literature since its description, and because 
of its rarity the following notes, illustra- 
tions and records are presented. 
The original description of the adults 
did not contain any illustrations of the 
structural features most important from 
the standpoint of identification. A few 
years later Needham & Claassen (1925) 
published line drawings of the apical seg- 
ments of the male and the subgenital plate 
of the female. Since these drawings are 
not very detailed, I think it worthwhile 
to present new drawings of these struc- 
tures and also some additional ones, fig. 
52, which should aid with the future 
recognition of this western species. 
Comparisons of Illinois Natural His- 
tory Survey material of theodora with 
that of californica (Banks) have revealed 
that the aedeagus of theodora is very dis- 
tinctive and differs markedly from that 
of californica and other species of dcro- 
neuria studied. Like californica, theodora 
belongs with the series of Acroneuria 
which do not possess anal abdominal gills 
in the nymphs or gill remnants on the 
subanal lobes of the adults. 4. depressa 
Needham & Claassen (1922) and pacifica 
