L, Lesquereux on the Coal Fermations of N. America. 371 
Bayou, Arkansas, I have found for the first time in America 
one of those beautiful wings of insects, referred by M. Germar 
t . 
Coal 1B. Its horizon appears to mark the epoch of the high- 
est development of the vegetation of the coal formation. Not 
only is this coal bed the most reliable of all, and consequently 
the m i d, not only does it attain locally an 
ost extensively worked, n¢ y a a Pa 
be characterized: First, 
he strata connected with 
nearly all the species of Zrigoncarpum, Cardiocarpum, Luiabac 
canpos and Dernolitees belong to it. Its second characteristic, is 
the great abundance of —— of Lepid 
Mes of this genus have 
Generally speaking, the coal has t 
