E. B. Sellards — Types of Permian Insects. 171 



State Geological Survey. A detailed account of the group is 

 therefore omitted from this paper. It has usually been observed, 

 in collecting from Paleozoic localities, that cockroaches exceed in 

 number of individuals all other insects combined. In the 

 Wellington shales the cockroaches are much in the minority. 

 A collection of something over two thousand insect specimens 

 was found to contain only about seventy cockroaches. From 

 these, two genera and ten species were identified. Of the two 

 genera, one is the well known Coal Measure and Permian genus 

 Etoblattina. The second genus is new. The ten species ob- 

 tained are new. The rarity of cockroaches in the Wellington 

 is in marked contrast to their relative abundance in most Coal 

 Measure and early Permian localities. 



Fossil insects have been obtained from the Birmingham 

 shales near Steubenville and Kichmond, Ohio, in the Cone- 

 maugh series just above the Ames or Crinoidal Limestone. 

 Recently reptilian remains heretofore supposed to be Permian 

 have been found near Pitcairn, Pennsylvania, in the red clay 

 below the Ames limestone.* The presence of the reptilian 

 remains has given rise to a question as to the age of the Cone- 

 maugh series. In the collection of insects from that locality, 

 Scu elder recognized twenty-two species referable to three genera. 

 All of these are cockroaches, other families not having been 

 found at this locality. Of these twenty-two species, seventeen 

 were referred by Scudder to the genus Etoblattina, three to 

 Gerabldttina, and two to Povoblattina. Of these genera 

 Etoblattina alone is recognized in the Wellington shales, and 

 as already remarked, the cockroach family is in the minority at 

 that locality. E"o one of the twenty-two species of the Kich- 

 mond locality has been recognized in the Wellington. On the 

 other hand, two of Scudder's species, Etoblattina maladicta 

 and E.benedicta (regarded by the writer as a single species 

 and referred to Sjpiloblattina), have been obtained from the 

 Leroy ( Coal Measure ) shales of Kansas.f It should be added, 

 however, that Handlirsch^: does not agree with the writer either 

 in uniting these two species, or in identifying them with the 

 specimens from the Leroy shales. Aside from the question of 

 discrimination of species, about which there may be differences 

 of opinion, the essential fact remains that a closely similar 

 type of wing development is seen in species from the two 

 localities. This type of wing venation is referred to by Scud- 

 der as the " remarkable openness of the neuration in the middle 

 of the tegmina.§ Handlirsch assigns to the cockroaches of this 



*P. E. Kaymond, Science, xxvi, p. 835, 1907. 

 fThis Journal, vol. xviii, p. 214-216, 1904. 

 JDie Fossilen Insekten, p. 240, 1906. 

 § Bulletin U. S. Geol Survey No. 124, p. 12, 1895. 



