53 
[Scudder. 
Length of fragment 23 mm. ; breadth of same 10 mm. ; probable 
length of wing 30-33 mm. ; probable breadth 11 mm. 
Barren coal measures between coal 7 and 8, Wills Creek, Rich- 
mond, Jefferson Co., Ohio. Collected Sept., 1884, by Henry Crew- 
then of Johns Hopkins University, to whom I am indebted for the 
opportunity of studying it. 
Etoblattina hnstoni, nov. sp. 
This species is represented by a single wing, rather more ob- 
scure than the others described here but differing conspicuously 
from them. It is the least slender wing of all, having certainly 
been not more than two and one-half times longer than broad. 
The costal margin is noticeably convex and the inner margin prob- 
ably nearly straight. The mediastinal area narrows slightly be- 
yond the middle, extends nearly to the end of the middle third of 
the wing and has many simple, straight, rather strongly oblique veins. 
The scapular vein is peculiar in that it is divided before the middle 
into two compound branches which do not act similarly, the upper 
being sinuous and supporting oblique, mostly simple branches, 
somewhat resembling the mediastinal, the lower straight with lon- 
gitudinally dichotomizing forks like the externomedian branches ; 
the lower must terminate scarcely above the tip of the wing, ap- 
proaching it more closely than is usual in Etoblattina. The ex- 
ternomedian vein is again peculiar, for it divides in the middle of 
the basal half of the wing into two main branches which do not 
again fork until beyond the middle of the wing and then with few 
longitudinal branches. The internomedian is very narrow and 
straight throughout, leaving the centre of the wing with very wide 
interspaces notwithstanding the early division of the externome- 
dian vein ; the internomedian vein appears to terminate far out 
toward the tip ; its branches are frequent, simple, oblique, gently 
curved, with the convexity toward the base ; anal area unknown. 
Length of fragment 19 mm. ; probable length of wing 25 mm. ; 
its breadth 10.5 mm. 
Barren coal measures of Will’s creek, Richmond, Jefferson Co., 
Ohio. Collected by Sam. Huston. 
