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Tribe LIMNOPHILINI. 
This is the most important tribe among the Limnobine whether 
living or fossil. Five genera and twenty-five species have been rec- 
ognized among the fossils, though only a very few of the European 
species are described or figured. Three or more species each of 
Limnophila, Trichocera, Tanymera, and Trichoneura—the last two 
extinct genera—have been recorded from the European tertiaries, 
besides one of the extinct genus Calobamon; these are all from 
amber except a single species each from Aix and Locle, belonging 
to Trichocera. From America only four species of Limnophila 
are known. 
LIMNOPHILA Macquart. 
Limnophila Macq., Hist. Nat. Dift., i, 95 (1834). 
Limnophila is a prolific north temperate genus with numerous 
species both in North America and in Europe, in each of which 
about thirty species are known. In North America it occurs across 
the continent and from Alaska to Mexico, and it is also found in 
South America. 
In his first studies upon this group, Osten Sacken suggested the 
use of several subgeneric names, which he proposed in a tentative 
manner, to be used until a complete revision of the genus could be 
made. In later writings he has still further subordinated these, 
which are in part founded upon minor points in the neuration 
of the wings. The examination of the few fossils of this group 
from Florissant seems to emphasize his later judgment, since 
we find several species with a cross vein in the first submarginal 
cell (one of the characteristics of his subgenus Dicranophragma), 
but which do not well agree in other features of Dicranophragma, 
while one of them has a supplementary cross vein in the costal 
area, as in Epiphragma—a group which he later regards as of 
generic value. It has seemed best, therefore, pending a complete 
revision of the Limnophile of the world, to use for these fossil 
species only the broader generic name Limnophila. It is a striking 
fact that of the four species known (each, unfortunately, by only a 
single example) three should have only four posterior cells, and 
three should have a supplementary cross vein in the first sub- 
marginal cell, both these features being rare in modern Limno- 
phile. 
PROC. AMER. PHILOS. SOC. XXXII. 143. 2B. PRINTED JAN. 17, 1894. 
