ee a Ne em See Le ee ee i. 
S. H. Scudder—Devonian Insects. 115 
lated; the others possess only transverse cross veins more or 
order, and in other ancient types the ancestors of living repre- 
sentatives of another order; were we unfamiliar with the 
divergence of these orders in modern times, we should not 
think of separating ordinarily their ancestors of the Carbonif- 
Pp 
known types, ancient or modern; and some of them appear to be 
even more complicated than their nearest living allies, With the 
xception of Platephemera, not one of them can be referred to 
any family of insects previously known, living or fossil; and 
even Platephemera, as shown above, differs strikingly from all 
other members of the family in which it is placed, both in 
gh neuration and in reticulation ; to a greater degree even 
