740 
Precisely in the case of porcellus, it can be proved in a very 
striking way, that this would be inappropriate. 
For not only the pattern of the seven transverse bars is repre- 
sented on the fore-wing, but that of the V-diagonal as well. Or ex- 
pressing it in other words, we may assert that the pattern of porcellus 
could be obtained by combination of that of Smerinthus populi with 
that of H/penor gall and euphorbiae, of course under omission or 
reduction of certain parts of each. 
The best proof for this assertion can be given by superadding 
the wing-patterns of the above-mentioned species to that of porcellus, 
or, otherwise, by marking with a darker hue those elements of 
foreign wing-designs in the porcellus-pattern that can be discovered 
in it. 
Bar I, otherwise called the marginal seam, shows in porcellus 
the usual type of an irregularly indentated, wine-red streak, which 
is characteristic of Chaerocampinae. It begins at the wing-tip with 
the above-mentioned oblique white stripe, which likewise is of so 
frequent occurrence among Sphingides, and can be considered as 
the outmost fragment of the V-diagonal. 
Bar II begins with a tolerably distinct, rather dark blotch, in the 
wine-red streak along the front-margin, but gets much fainter as 
soon as it enters the yellow-brown central area of the wing, which 
it traverses in a well-marked inward curve. 
Bar III likewise begins at the front-margin with a double-blotch, 
but becomes a single band when entering the yellow area, and at the 
same time gets into contact with the discoidal spot, which itself may 
be considered as a remnant of Bar IV. Furtheron B. III runs parallel 
to II, both being dislocated a little in the direction of the wing-root. 
V and VI are represented by a pair of small, greenish-brown 
stripes in the red field, VII can confusedly be traced in the brownish 
root-area. 
On the upper side of the hindwing the only point of similarity 
with the forewing is formed by the wine-red marginal seam, but 
the underside once more proves, that also in porcellus well-marked 
remnants of the transverse bars occur in the shape of dark spots 
and stripes on the light-yellow and rose-red fond. As in most other 
cases these are especially well-marked along the front-margin. 
At the underside the similarity between fore- and hindwing is 
again much more pronounced than on the opposite surface, the 
design on the firstnamed wing being more reduced than on the last, 
especially as regards the root-field. 
The same red, violet and greenish-golden-brown hues that decorate 
