49 
[Scudder. 
wing that it may be described. It is not so slender as E. tenuis 
and tapers more rapidly, but still equally beyond the middle, the 
tip being more produced but still rounded. The mediastinal area 
is much more important than in that species, the principal vein 
being farther removed from the costal margin and extending prob- 
ably to the end of the middle third of the wing, its branches dis- 
tant, simple, arcuate, with the convexity inward. The scapular vein 
is almost exactly straight to beyond the tip of the mediastinal and 
then curves gently upward to the margin, terminating only a little 
before the tip and having about five equidistant, mostly simple 
branches, the first one not originating far before the middle of the 
wing. The externomedian vein is peculiar ; it first forks opposite 
the basal fork of the scapular vein, the upper gently sinuous fork only 
branching near the tip ; the lower, curving rather conspicuously 
downward, emits close together several long, mostly simple, arcuate 
branches. At about the middle of the wing, the internomedian vein 
changes a declivent for a longitudinal course, thus more than halving 
the width of the interspace above it when it approaches the down- 
ward curve of the externomedian vein, and making a half-closed cell 
of this interspace, resembling somewhat a similar feature in Spilo- 
blattina of the Coloradan Trias ; by this means it reaches far out 
toward the tip of the wing and its branches, which before had been 
rather distant transversely oblique, and strongly arcuate with the 
convexity inward, become less arcuate, and nearly longitudinal. 
The anal area is not preserved. 
A feature of the wing which it shares in some degree with other 
species from the same locality, but which is absolutely wanting 
in E. tenuis , is a broad piceous banding of the principal veins and 
branches. This does not, however, follow the veins implicitly, 
but is based upon the neuration. It forms a black belt following 
the entire course of the internomedian vein and edging the lower 
margin of the wing; another broader belt follows the externome- 
dian as far as the second branch ; here it divides into two, one 
merging into the internomedian belt, the other into a still broader 
one which has embraced both the scapular and mediastinal stems. 
Or, the wing might be described as piceous with pale gray streaks, 
one short one in each interspace between the internomedian ner- 
vules, one in the main externomedio-internomedian interspace, one 
in the scapular-externomedian interspace (each of the last two ter- 
minating with the narrowing of the interspace), one running ob- 
PROCEEDINGS B. S. N. H. VOL. XXIV 4 JANUARY, 1889 . 
