: 
- 
September, 1942 
and additional records of specimens from 
Missouri and Oklahoma were added in 
1935. Since the Missouri record was 
based upon a nymph whose identity was 
assumed because of the presence of claas- 
seni in similar and adjacent territory in 
Ilinois, a doubtful procedure in this genus 
where nymphs are of homogeneous appear- 
ance, | am pleased to confirm the Missouri 
record from adult specimens and to add 
additional distributional records as fol- 
lows. 
INDIANA.—TURKEY RUN StTaTE Park, Newby 
Gulch: May 12, 1933, T. H. Frison & C. O. 
Mohr, 1 nymph. Tributary of Sugar Creek, 
east of TuRKEY RUN STATE Park: April 9, 
mv, 1. H. Frison & H. H. Ross, Nr SRE 
1 nymph. 
Missourt.—Southeast of ELLSINORE: March 
8, 1939, I. H. Frison & C. O. Mohr, 14 
(reared), 19, 2 nymphs. 
OHIO.—AsH CAVE: March 6, NSS od Nee ale & 
Frison, 12. 
New illustrations of the important male 
and female structures, fig. 18, are present- 
ed to aid with the separation from other 
[linois species. Both the male and the 
female of this species are markedly differ- 
ent from decepta Claassen and tenuis 
(Pictet), the other two Illinois species of 
—4 
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Fig. 18.—Leuctra claasseni 
Frison: NorrH AMERICAN PLECOPTERA 
257 
Leucitrg xin fact. claasséni is so distinctive 
that it represents a subgroup or division 
among North American species of the 
genus, which Hanson (1941) has named 
Paraleuctra. 
Leuctra decepta Claassen 
Leuctra decepta Claassen (1923, 
Original description, gee 
Leuctra decepta Needham & Claassen C192 5) 
p. 227). Additional record. 
Leuctra decepta Claassen 
Nymphal description. 
Leuctra decepta was described from 
New York specimens and, since the orig- 
inal description was published, this species 
De 260). 
(1931, p. 99), 
STERNITES 
1 GO ABDOMINAL TERGITES 
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Fig. 19.—Leuctra decepta. 
has not been recorded from other states. 
The recent finding of this species in south- 
ern Illinois and other places indicates it is 
widely distributed in eastern North Amer- 
ia: 
Since this species was not known to 
occur in Illinois when my report on the 
Illinois stonefly fauna was published in 
1935, 1 am presenting illustrations, fig. 
19, to aid with its recognition. The struc- 
tural features of both male and female 
show decepta to be much more closely re- 
