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them as I dare not decide which are really due to cross-veins and 
which are not. 
Judging by the course of the veins the wing seems to have been 
of a very high triangular form. 
Length of the preserved piece 14 mm. 
1 specimen, without locality (poss. Min. Museum). 
Lechæa primigenia n. sp. 
The find, dealt with in the following, consists of one fore wing 
and the marginal part of the other fore wing (of which the rest is 
hidden in the stone). Also here Clavus is missing. As far as the 
course of its veins may be stated with certainty, the venation turns 
out to be in so great agreement with the recent Flatid genus Lechæa 
that I have no doubt in referring it to this genus. The Eocene Flatid 
genus Lithopsis Scudd. to which Scudder as well as Cockerell have 
referred several Flatid wings described by them, is out of the question 
here — both as regards this find and the above mentioned Ormenis 
far cat a. Scudder’s species have a totally different venation, and 
Cockerell’s figures do not allow any comparison, as the venation 
cannot be stated in them. 
It is characteristic of the present species that the costal cell is 
relatively narrow, more so than the costal membrane, and that the 
cross-veins of the costal cell are not bifurcate as in the recent species, 
but simple. Subcosta, on the other hand, is bifurcate quite distally. 
Radius bifurcates almost midway on the wing, and its anterior branch 
soon after once more bifurcates, the posterior branch, however, about 
