312 Intinoris NaTtuRAL History SURVEY BULLETIN 
be identical with specimens in the Illinois 
Natural History Survey collection from 
Tennessee and North Carolina. 
Except for Ricker’s drawing showing 
the triangular-shaped subgenital plate of 
NyMPHAL 
MAXILLA 
Ny MPHAL 
L_ABIUM 
9 HEAD AND 
PRONOTUM 
G' ABDOMINAL 
TERGITES 
MEAG! 
NNN ere 
3 ABDOMINAL STERNITES 
apis 85 
Isoperla 
holochlora. 
“~BDOMINAL 
SEGMENTS 
the lectotypic female, no illustrations of 
this species have been published, and no 
records other than that of “Georgia” 
associated with the types have been intro- 
duced into literature. 
Illinois Natural History Survey field 
work, as well as the study of some material 
submitted for identification, has revealed 
the presence of this species in several east- 
Vol. 22, depae 
ern states. Rearings have enabled me to 
associate the previously unknown nymph 
with its adult and definitely to establish 
the correct association of males with fe- 
males. To facilitate future identifications 
of this species, illustrations of the im- 
portant characters of the adults, fig. 85, 
are given and a description of the nymph 
is presented. 
Nympu.—General structural features 
approximately the same as for nymph of 
Isoperla patricta, described in this paper. 
Labium and maxillae as in fig. 85. Gene 
eral color pattern as in fig. 86, with tend- 
ency in some specimens for a broad, pale, 
longitudinal medial area on abdominal 
tergites to be more obscured. 
Records for this species, based upon Illinois 
Natural History Survey field collecting and 
specimens submitted for identification, are as 
follows. 
MAINE.—Mount KaraubI, Roaring Brooks: 
Aug. 26, 1939, T. H. Frison & T. H. Frisom 
[eo cr ee 
Fig. 86—Nymph of Isoperla holochlora. 
