1910] Reiff—Argynnis Cybele bartschi 253 
surrounded by woods, and a flight to this place from localities 
far away is highly improbable. 
The two photographs reproduced on the accompanying plate 
show very well the upper and under side of the specimen. It 
will be noticed that the fore wings do not have the breadth of 
normal Argynnis forms, while the hind wings show a more oval 
rounding than usual. All rows of spots and points beyond the 
base are confluent into more or less distinct bands and this is 
true both of the upper and under side of all the wings. It is this 
which gives the specimen its extraordinary appearance. 
The bands nearest the border are more distinct and complete 
than the inner bands, but except for the yellow on the upper side, 
which is somewhat lighter than usual, the colors are almost normal. 

Fig. 1. Argynnis cybele Fabr., forma bartschi Reiff. Wing venation. 
Now what is the cause of this peculiar aberration? At first I 
thought that I could consider it as a mutation, produced by 
some external influence, until I carefully examined the venation. 
Then I found that it was a “peroneurous aberration,” 7. ¢., an 
aberration, which is produced by the absence of one or more 
veins or parts of veins. The expression “peroneurous aberra- 
tion” was created by Professor Spengel of Giessen (Germany), 
from the Greek 77p0s-aborted. A short time ago I described 
a ‘“‘peroneurous aberration” of Papilio machaon in a paper which 
will appear in the next issue of the “Zeitschrift fiir wissenschaft- 
liche Insekten Biologie.”” In the accompanying drawing I repre- 
sent the venation of the Argynnis. The venation in the two 
