September, 1942 
Abdomen, fig. 112, with tenth tergite 
not cleft; subanal lobes recurved upwards 
and over tenth tergite and with promi- 
nent, long, sharply pointed tips; ninth 
sternite produced much beyond tip of ab- 
domen and rounded behind; eighth ster- 
nite with a stubby lobe on posterior mar- 
Bite pale? 
Length to tip of wings 13 mm ; length 
to tip of abdomen 10 mm. 
(uy ‘ 
\ 
AW 
NYMPHAL 
MAXILLA 
NymMPHAL LaBium 
@ TERMINAL ABDOMINAL 
STERNITES 
? TERMINAL ABDOMINAL 
STERNITES 
& TERMINAL ABDOMINAL 
TERGITES 
& HEAD AND 
PRONOTUM 
Fig. 112.—Isoperla lata. 
Frison: NortH AMERICAN PLECOPTERA 
23D 
FEMALE.—Head, thorax, basal abdom- 
inal segments and appendages in general 
similar to those of male but slightly larger 
ee 
Fig. 113—Nymph of Jsoperla lata. 
in size. Important differences are as fol- 
lows: eighth abdominal Stermtentoa.whl 2, 
with subgenital plate slightly produced 
over ninth sternite and broadly rounded, 
Holotype, male—Boulder Junction, Wis.: 
reared April 20, 1937, from nymph taken in 
small stream April 9, 13/7 n ee He Prison. & 
C0. Mohr: 
Allotype, female—Same data as for holo- 
type. 
Paratypes. — Wisconsin. — BouLDER JUNC- 
TION: Same data as for holotype except reared 
April 30, 1937, 19. 
MIcHiGAN.—LoveLis, north branch of Au 
Sable River: June 16, £935, .J. W. Leonard, 
22. North of St. IGNAcE: May 11, 1940, T. 
H. Frison & H. H. Ross, 12. 
QuEBEC. — LAURENTIDES NATIONAL Park, 
Pikauba_ River: July 7, 1 1938) “Charles 
Gauthier, 19. 
NymeH.—General color bright yellow 
with sharply contrasting black areas on 
