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porcellus, are found back in elpenor, a great superficial similarity 
resulting from this, which finds its expression in the popular names. 
But in tbe pattern an important difference prevails, for in elpenor 
the traces of transverse bars along the front-margin are almost 
completely absent, while on the contrary the V-diagonal-design is 
strongly expressed, though in factit reaches the back-margin of the 
wing in its more distal part, and therefore deviates in a lower 
degree from the original transverse direction of the primary bars 
than is the case with other Chaerocampinae. 
Fig. 1. (after Denso). 
Denso pays special attention to this vicariating relation between 
the two parts of the back-margin of different species of Celerio, 
into which it is divided by the above-mentioned oblique line, which, 
starting from the wing-tip, forms the outer border of the light middle- 
field. He arranges these species in a series, beginning with lineata, 
where the meeting-point of this line with the back-margin lies 
farthest towards the proximal side, and ending with ntcaea, which 
in its more distal position of this point more or less agrees with 
elpenor. 
As far as 1 feel able to understand his views, he seems, for 
the just-mentioned reason, to consider lineata as more original than 
nicaen. 
According to my conviction the relation between these two species 
is precisely the opposite one. 
To me it just seems remarkable that Denso, when speaking of 
another detail of the wing-design, which he remarked in a few 
