September, 1942 
holotype was collected. The exuviae rep- 
resent both males and females, are very 
' dark, lack a longitudinal pale stripe on ab- 
- dominal tergites, lack coxal gills and, from 
shape of apical abdominal segments, un- 
doubtedly should be associated with rossi. 
The peculiar, pointed projections on the 
tenth abdominal tergite, combined with 
the lobe on the ninth abdominal sternite, 
readily separate the adult of this new spe- 
cies from adults of all previously described 
species. 
Brachyptera limata new species 
Mate.—General habitus similar to that 
of other species of Brachyptera. Head, 
thorax and abdomen mostly yellowish 
RIGHT WINGS 
G ABDOMINAL TERGITES 
Fig. 16.—Brachyptera limata. 
Frison: NortH AMERICAN PLECOPTERA 
255 
# x 
f 
g % 
% 
% i 
‘ \ Toh 
Fig. 17—Nymph of Brachyptera limata. 
brown, antennae and parts of thorax dark 
brown. No traces of membranous gill 
scars on coxae. Wings stained with brown, 
venation as in fig. 16. 
Apical abdominal segments intricately 
modified and presenting the most distinc- 
tive characters for this new species, fig. 16, 
as follows: Ninth abdominal sternite 
greatly prolonged into a plate which ex- 
tends back beyond tip of abdomen, then 
bends upward, but becomes considerably 
narrowed at tip, without a lobe near base ; 
tenth abdominal tergite without any pro- 
jections near base; cerci several segmented, 
with a small globose lobe above base: 
supra-anal process short, somewhat  re- 
