506 University Geological Survey of Kansas. 
the apex; four oblique branches pass to the costal border, the 
first and second of which are compound. The median area is 
strongly developed and fills the apical part of the wing; its 
first branch, given off near the base, is long, twice forked, and 
runs through the center of the wing to the apex; numerous 
other superior branches go to the apex; the main vein gives off 
a thin, simple, inferior branch about the middle of its course. 
The cubitus has a sinuous course and reaches two-thirds the 
length of the tegmina. The main vein and its branches are 
very thin and delicate, flexuous, and inconstant in their course. 
The first branch presents an anomalous condition; it forks at a 
wide angle and one division runs directly across the second 
branch of the cubitus and unites with the first inferior divi- 
sion of the third branch throughout the distal half of its length. 
The basal half of both of these veins—the second branch of the 
cubitus, and the first division of the third branch—is thin and 
indistinct and is apparently becoming aborted. The third cu- 
bital branch gives off four inferior veins. The anal area ex- 
tends approximately one-third the length of the inner border. 
It is broad, triangular, marked off by a deep furrow, and has 
about nine thin, mostly simple veins. 
The broad wing and the habit of branching of the cubitus 
suggest a comparison with M. bretonensis Scudder from Cape 
Breton. WM. latissima, however, is much larger, with the main 
veins free at the base, the radial area less developed, the me- 
dian much more so, and the first branch originating earlier. 
Although peculiar in the arrangement of the cubital branches, 
this species presents nothing of the anomalous disposition of 
the anal veins described for M. bretonensis. 
Formation and locality: Le Roy shales Upper Coal Meas- 
ures, Lawrence, Kan. Type No. 36, University of Kansas col- 
lection. 
Promylacris. 
Seudder, Proce. Acad. Nat. Sei. Phila., p. 34, 1885. 
To this genus is referred those species having small sub- 
costal and very large radial areas. Most of the species of the 
genus are small. 
Promylacris radialis sp. nov. Pl. LXX, fig. 8; pl. LXXXI, fig. 5. 
Tegmina slender, costal border but slightly arched; apex 
obtuse. The subcostal area is small, the main vein having 
only three main branches, and these originating close together 
