Help-notes towards the determination 
and the classification of the 
European Myrmeleonidae. 
I By 
P. Esben-Petersen, Silkeborg. 
I trust that the following notes, and especially the pho- 
tos may be of some value for the future study of the Euro- 
pean Myrmeleonid-Fauna. 
My best thanks are due to H. Stitz, Berlin Museum, 
and Dr. Zerny, Vienna Museum, for their great readiness 
to help me. I am especially much indebted to Dr. Zerny 
for the opportunity of examining and photographing some 
of Navas's type-specimens. 
In the wings of the Myrmeleonidae Sc and R unite 
at the pterostigma, and from the pterostigma to the tip 
' of the wing they continue as a single nervure. The area 
beyond the pterostigma and between C and Sc + R is 
named the apical area. The branches from Sc + R in that 
area are often connected by crossveins. Rs arises from R 
more or less close to the base of the wing; it runs almost 
parallel to R, and between R and Rs is found a series 
of crossveins. Rs emits a series of branches connected 
with each other by crossveins, some of which, espe- 
cially towards the apex of the wing, form more 
or less regular series; one or more of these apical series 
are often shaded. In a number of Myrmeleonidae the bran- 
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