‘RIGHT WINGS 
LATERAL VIEW - 
4 AEDEAGUS . 
ENTRAL VIE 
DORSAL 
VIEW 
i 
ARR 
Tes 
if 
TM 
k 
SS 
STERNITES 
————— 
é 
SS = 
BDOMINAL 
3 
> 
DISSECTION 
SHOWING VENTRAL 
VIEW OF MALE 
SUBANAL LOBES 
\ 
\ 
i 
c 
i ; 
t 
ABDOMINAL 
SEGMENTS 
ie 
———— 
il 
“Es 
i 
: 
i 
i 
| 
oh 
Oe 
———S 
i> 
—— ——+ 
SSS 
=== 
= 
2 
7 
| : 
| I 
Laie IWS 
i nit HII 1 Ky \ Bs SS 
————— 
cos: 
= 
Hl \ 
EA 
Fig. 8.—Taeniopteryx lita. 
MississipPI.—PoTts CAMP: Feb. 17, 1941, T. 
Hi Brison,.i6 23 
This is a species apparently with a more 
southern distribution than parvula and 
easily apt to be confused with it. It is not 
unlikely that some of the records of Need- 
ham & Claassen (1925) for parvula per- 
tain to this new species. Illinois records 
of parvula from Elizabethtown (in part), 
ItLtrnois NaturAL History SURVEY BULLETIN 
V ol. 22, Art? 
Golconda and Grayville (in part) record- 
ed in my 1929 and 1935a papers belong 
to this species. 
Brachyptera fasciata (Burmeister) 
Semblis fasciata Burmeister (1839, p. 875), 
Original description. 
Strophopteryx fasciata Frison (1929 and 
1935a, pp. 384 and 347, respectively). Addi- 
tional descriptions. 
In 1929 I proposed the generic name of 
Strophopteryx for the inclusion of fasciata, 
because fasciata possessed some characters 
which did not fit the various genera then 
in use for the Taeniopterygidae. Also, I 
wished to emphasize the marked funda- 
mental differences existing in both adults 
and nymphs between such Illinois stone- 
flies as the species then known as Taeniop- 
teryx nivalis (Fitch) and Semblis fasciata. 
In my remarks in this article under the 
heading of Taeniopterygidae, I have stated 
my reasons for now recognizing but two 
genera in this family, Taentopteryx and 
Brachyptera. This procedure reduces 
Strophopteryx to subgeneric status along 
with such names as Rhabdiopteryx Kla- 
palek and Oemopteryx Klapalek. 
While determining large series of fascr- 
ata, | have observed instances of variation. 
The most noticeable involves the occur- 
rence or non-occurrence of membranous 
; Mees é == 
SUBANAL LOBES G ABDOMINAL TERGITES 
Fig. 9—Brachyptera fasciata. 
‘| 
SUBANAL LOBES 3 ABDOMINAL TERGITES: 
Fig. 10.—Brachyptera fasciata. 
