SELLARDS. | Cockroaches. 509 
unites with the subcosta, 4 or 5 mm. from the base, thus giv- 
ing it much the appearance of a strong radial sector. The 
partial basal union of the main veins and the deep subcostal 
fold are apparently modifications for securing support for 
the broad but thin hind wing. The forking of the vein occupy- 
ing the anal furrow is seen on six well-preserved specimens 
and is evidently the normal character. In five of the six it is 
simply forked, but in one case, wing No. 2, University of Kan- 
sas collection, a second branch is seen near the tip. The man- 
ner in which branches are given off from the first anal vein 
beyond the anal furrow and their termination on the following 
anal vein is very suggestive of some Permian hind wings in 
which a fold is developed along this line. Occasionally among 
the Coal Measure wings the part of the anal area beyond this 
line is seen folded under, as in wing No. 203, University of 
Kansas collection. 
The costa, subcosta and anal veins of the hind wing are thus 
seen to differ entirely from the same veins in the front wing. 
Some resemblances remain, however, in the veins of the cen- 
tral part of the wing. The radius of the hind wing, except for 
its basal union with the subcosta, is not unlike that of the 
front wing. The media also, although occupying more area 
relatively, is otherwise not unlike the media of the front wing. 
The cubitus of both wings gives off one or two thin branches 
from the upper side. 
It seems probable that the heavy-bodied nymph shown in 
figure 3, plate LX XII, may be the immature form of EL. scud- 
deri, as it is apparently too large for the young of any of the 
associated species. 
Formation and locality: Le Roy shales, Upper Coal Meas- 
ures, Lawrence, Kan. University of Kansas collection, Nos. 9, 
AA, 96, 100, 109, 141, 157, 202, 140?; Yale collection, Nos. 4, 
23, 98, and one specimen in lot No. 2685; author’s collections, 
Nos. 1, 3, 37. Hind wing, University of Kansas, Nos. 2, 15, 
36, 203, 210; Yale, No. 81; author’s collections, Nos. 2, 4, 27?. 
Etoblattina obscura sp. nov. Pl. LXX, fig. 5; pl. LXXIX, figs. 1, 2; 
pl. LXXXI, figs. 2, 4; pl. LX XXIII, figs. 1, 2. 
Cockroaches with arched, thick, dark-colored front wings, in 
which the venation is indistinct or partly obscured; inner 
border nearly straight, slightly interrupted by the anal area. 
Subcosta variable in extent, reaching from less than one-third 
