SELLARDS. | Cockroaches. 527 
entire. The head is displaced to the right of the pronotum. 
The antennze are very well preserved. On the pronotum is 
seen a circular mark which seems to be characteristic of the 
species. Traces of the venation are evident, the cubitus and 
its branches, as is usual among nymphs, being the first to ap- 
pear. Parts of the legs are exposed at the sides of the body. 
The tibia is spinous and the tarsus apparently long. The 
pointed free edges of the terga are evident. The cerci, al- 
though incomplete, are unusually long. A considerable num- 
ber of specimens of this general type and in various stages of 
development have been obtained from the Le Roy shales. Dur- 
ing the early stages the corners of the pronotum are rounded. 
As the nymph approaches maturity the corners become more 
pointed and the pronotum broader in proportion to its width. 
The cubitus is the first of the veins to appear in the developing 
wing, and in some of the larger specimens most of the veins 
of this area can be seen. 
The first three or four terga and sterna of the specimen 
illustrated by figure 18, plate LXXV, are seen in place, the 
sterna showing as impressions through the terga. In the 
wings of this specimen traces of the venation are evident, as 
is also the thickened spot at the base, which marks the point 
at which the articulation of the wing with the body is found. 
The detached wing of figure 20 of the same plate is from a more 
mature individual, and traces of all of the main veins are to be 
seen. The cubitus especially is well developed. Two or three 
anal veins are to be seen also, although the anal area is not as 
yet distinctly marked off. The detached wing photographed, 
figure 3, plate LX XXII, has reached about the same stage of 
development and shows a similar distribution of veins. The 
trochanter, femur and tibia of one leg, with a detached tergum 
at the side, are seen in the specimen illustrated by figure 27, 
plate LXXV. The medium-sized specimen of figure 19 of the 
same plate is interesting as showing, besides parts of the body, 
a considerable part of the slender antenne, and something of 
the crushed head. 
Formation and locality: Le Roy shales, Upper Coal Meas- 
ures, Lawrence, Kan. 
Etoblattania? sp. Pl. LXXII, fig. 3. 
The large nymph illustrated by figure 3, plate LX XII, has a 
very bulky abdomen with unusually prominent epimera and 
