SELLARDS. | Cockroaches. 515 
vein straight, branches very oblique, simple, and straight. 
Radial strongly developed, curved up a little at the base, then 
passing with a slightly flexuous course through the middle of 
the wing. The first branch arises close to the base. Numer- 
ous other simple or compound branches, about nine in all, pass 
obliquely to the costal border. The media branches first oppo- 
site the end of the anal area, its first division in the type speci- 
men ending blindly before reaching the border. Three other 
branches are given off, two of which are forked. The cubital 
area extends about two-thirds the length of the wing. Six 
branches are given off, three of which are forked. The first 
branch presents an anomalous condition occasionally seen in 
the cubital area of other species, one division running directly 
across the second cubital branch. The anal furrow is distinct. 
The anal area has four simple curved veins. 
The large area occupied by the radius brings this species 
within the genus Archimylacris. The only species with which 
it admits of close comparison is A. parallela Scudder, from a 
much lower horizon. The radius of this new species branches 
much earlier and the subcosta is shorter. Length of tegmina, 
24 mm.; width, 10 mm. 
Formation and locality: Le Roy shales, Upper Coal Meas- 
ures, Lawrence, Kan. Type No. 138, University of Kansas 
collection. 
Gerablattina. 
Scudder, Mem. Bost. Soe. Nat. Hist., vol. III, p. 97, 1879. 
Gerablattina arcuata. Pl. LXX, fig. 3; pl. LX XXII, fig. 4; pl. LXXVII, 
g. 10 
Sellards, Amer. Jour. Sci., vol. 18, p. 216, text fig. 1; pl. I, fig. 7. 
Tegmina about twice as long as broad, outer border strongly 
arched, the apex rounded; inner border nearly straight, in- 
terrupted by the anal area. Subcosta arched parallel to the 
costal border, reaching three-fourths the length of the wing; 
branches numerous, simple, thin, curved and parallel. The 
radius is but slightly developed, branches first beyond the 
middle of the wing and falls short of the apex. The media, 
like the radius, occupies a comparatively small area, and re- 
mains simple until beyond the middle of the wing, its four 
simple oblique branches filling the apex. The cubitus is 
strongly developed and reaches almost to the apex. The first 
five branches are simple and nearly straight; the others are 
more oblique, closer and curved. The anal area is well marked 
and has about seven simple veins. In texture and general ap- 
