1948 ] 
Carpenter — Permian Insect f rom Texas 
103 
and Ideliids have a net-work of cross-veins covering the 
entire wing, and all have the posterior branch of M in- 
dependent of CuA. The conclusion that these two veins 
are partially anastomosed in Ideliopsis has been reached 
by comparison with Metidelia and Idelia. In both of 
these, the media has a long posterior branch and CuA lias 
two main branches. In Ideliopsis , M appears to lack the 
long posterior branch and CuA appears to have an extra 
anterior branch. It seems probable, therefore, that the 
posterior branch of M has become attached to CuAl. 
The stratum which yielded Ideliopsis is apparently 
about the same age as the insect beds near Elmo, Kansas. 
At any rate, the Belle Plains Formation of Texas, in 
which the specimen of Ideliopsis was found, has tenta- 
tively been correlated with the Wellington Formation of 
Kansas, of which the Elmo limestone is a member. 2 C. B. 
Read (in King, 1939, p. 697) has referred to the plants of 
the Belle Plains Formation as a “ Gigantopteris assem- 
blage.” David White, who published a list of the plants 
of the Formation, 3 noted the occurrence of insects in the 
main plant bed, 4% miles southeast of Fulda, though he 
did not mention their being found at Castle Hollow. In 
1932 I searched for insects at both localities for several 
days, but without success. 
2 A. S. Romer, 1935, Bull. Geol. Soc. Amer., 46: 1597—1658 (esp. fig. 3). 
P. B. King, 1939, Bull. Amer. Assoc. Pet. Geol., 26: 535-763. 
s David White, 1912, Proc. U. S. Nat. Mus., 41: 506. 
