412 
Psyche 
[December 
the hind wings, which are very little known in Paleozoic roaches. 
As shown in the photograph (Figure 7), the specimen shows part 
of the thorax, apparently a middle and hind leg, and the two hind 
wings, the length of the complete hind wing being 20 mm. The 
thorax has obviously been crushed and distorted but the mesothorax 
(M) can readily be distinguished, the former showing scars of the 
dorsoventral muscles. However, one can distinguish a fairly large 
coxa, small trochanter and large femur and tibia; the segmentation 
of the tarsus is not preserved. The hind wing is of interest because 
of the preservation of most of the veins. The venational pattern is 
similiar to that of the hind wing which Tillyard described as belong- 
ing to the genus Pycnoblattina Sellards, from the Lower Permian 
of Kansas, although the Madera specimen shows a somewhat 
shorter subcosta. The posterior margin of the hind wing is clearly 
preserved to the level at which the anal fan presumably extended. 
This specimen indicates, as noted previously by Tillyard, that the 
anal area was very small in at least some of the Paleozoic roaches, 
in contrast to its development in most Recent Blattaria. 
Literature Cited 
Bates, R. L. and others 
1947. Geology of the Gran Quivira quadrangle, New Mexico. New 
Mexico Bur. Mines and Min. Resources Bull., 26: 16-23. 
Carpenter, F. M. 
1943. The Lower Permian insects of Kansas. Part 9. Proc. Amer. 
Acad. Arts and Sci., 75 (2): 55-84. 
Keroher, G. C. and others 
1966. Lexicon of geologic names of the United States for 1930-1960. 
Part 2: 2315-2316; Part 3: 3436-3437. 
Kukalova, J. 
1969. Revisional Study of the Order Palaeodictyoptera in the Upper 
Carboniferous Shales of Commentry, France. Part II. Psyche, 
76: 459-486. 
1971. The Structure of Dunbaria fasciipennis Tillyard (Palaeodictyop- 
tera). Psyche, in press. 
Read, C. B. and others 
1944. Geologic map and stratigraphic sections of Permian and Penn- 
sylvanian rocks of parts of San Miguel, Santa Fe, Sandoval, Ber- 
nalillo, Torrance and Valencia counties, north central New 
Mexico. U. S. Geol. Survey oil and gas Investigations, Pre- 
liminary Map, 21. 
Read, C. B. and G. H. Wood 
1947. Distribution and correlation of Pennsylvanian rocks of late 
Paleozoic sedimentary basins of northern New Mexico. Journ. 
Geol., 55: 220-236. 
