SELLARDS. | Cockroaches. 5385 
Wellington shales, Htoblattina, continuing over from the Coal 
Measures, and Puknoblattina, a new genus. The ten species 
found in the Wellington are all new. They are in general 
much smaller than the Coal Measure species, while the com- 
pact wings of the species of the genus Puknoblattina is sug- 
gestive of an approach to Mesozoic cockroaches. Cockroaches 
were apparently by no means so abundant relatively during 
Permian time as they were during Coal Measure time. The 
number of cockroach specimens obtained from Coal Measure 
localities are usually found to exceed all other insects com- 
bined. In the Wellington shales the cockroaches are much in 
the minority. A collection of something over 2000 insect spe- 
cimens from this formation made by the writer is found to con- 
tain only about 70 cockroaches. Of the associated insects the 
orders Odonata and Plectoptera have been described by the 
writer in the American Journal of Science (vol. 22, pp. 249- 
258, 1906; vol. 238, pp. 345-355, 1907). A description of the 
remaining material obtained from the Permian has not yet 
been published. It may be said, however, that the insects con- 
sist largely of new types and that the fauna represents a dis- 
tinct advance over the Coal Measure insect fauna." 
807. Since the above was written representatives have been described of the Mega- 
secoptera, Oryctoblattinide, and Protorthoptera. Amer. Journ. Sci., vol. XXVII, pp. 
151-1738, 1907. 
