1882 .] 
391 
[Seuddcr. 
A NEW AND UNUSUALLY PERFECT CARBONIFEROUS 
COCKROACH FROM MAZON CREEK, ILL. 
BY SAMUEL H. SCUDDER, 
Etoblattina mazona nov. sp. 
The front wing is moderately broad and resembles in shape 
that of E. russoma, E. carbonaria and E. venusta ; the costal 
margin is pretty regularly and considerably convex, while the 
inner margin away from the base is probably pretty straight ; the 
tip is regularly and well rounded, the wing beginning to taper con- 
siderably only in the middle of the apical fourth ; the humeral 
lobe is produced to less than a right angle, scarcely rounded off. 
The ve ns originate a little within the middle of the outer 
two-thirds of the base of the wing, and are no more arched 
than the opposite costal border. The mediastinal vein runs sub- 
parallel to and rather distant from the costal border, terminat- 
ing at about three-fifths the distance to the tip ; the basal fourth 
of the area seems to be free from branches, but beyond that 
there are six or seven equidistant, considerably oblique, simple or 
singly forked veins, the forked ones occurring apically ; in the 
single specimen seen there are three forked veins in the left, one 
in right wing, and the basal branches are more distant from each 
other on the right than on the left wing ; at the greatest width of 
the area, near the base, it is scarcely less than one-fourtli the 
width of the wing. The scapular vein runs subparallel to the 
costal margin but diverges a little from it beyond the basal 
third of the wing, afterward, in the apical fourth, sweeping 
upward again to terminate a little above the extreme tip ; it 
begins to branch at or just beyond the basal third of the wing 
and emits from four to six simple, forked or compound, curving 
veins to the costal border, having nearly the general direc- 
tion of the apical mediastinal branches ; in the specimen in 
hand there is some difference between the forking of the vein in 
the two wings ; in the left wing the branches are distant at base 
and four in number, the first compound, emitting from near the mid- 
dle of its upper side two approximated, apically forking branches, 
