486 
NORTH AMERICAN PLECOPTERA 
In this species wings rather long and narrow ; a scanty irregular, apical net- 
work of cross-veins occupying the region between the branches of the sector 
and media; the costal margin not showing a concavity at the humeral cross- 
vein; the entire costal area beyond the humeral cross-vein occupied by numer- 
ous cross-veins; subcosta passes into radius before the level of the cord, the 
length of the inner inter-radial ceU only a fourth greater than its base; cord 
well developed; the first anal vein not angled at the base as in all other species 
of this tribe (fig. 65). Without gills. 
Female. The posterior margin of the eighth ventral segment is evenly 
produced forming a short, broad, hemispherical vulvar lamina (fig. 56). 
One female specimen from New Mexico and another from 
Florissant, Colorado, VI, 1907 (T. D. A. Cockerell). The 
specimen from New Mexico is the type of this species. It is at 
Cornell University in the entomological collection. 
Abbreviations 
Sub. A. P. Sub-anal plate. 
Sup. A. P. Supra-anal plate, with the following parts; — 
C. Sperm cup. 
F. Free end. 
I. Inner part. 
L. Link. 
L. B. Lateral brace. 
L. S. Lateral stylet. 
M . Muscle. 
M. S. Median stylet. 
P. G. P. Para-genital plate. 
P. T. Protractile tendon. 
R. T. Retractile tendon. 
P. A. P. Para-anal plate. 
S. Membranous sac. 
