739 
obliquely across the wing from tip to root). Consequently in my 
opinion the most original pattern must be looked for in those Chaerocam- 
pinae that show the fewest traces of this influence of the V-diagonal 
on the transverse bars. Now it is evident that this does not at all 
occur in zygophylli and lineata, but on the contrary in Pergesa 
(Deilephila, Metopsilus) porcellus, and better still in Berutana (Metop- 
silus) syriaca. In this latter the forewing shows a set of transverse 
bars which remarkably agree with that of Smerinthus populi, though 
they do not to any notable degree pass over upon the hindwing. 
The V-diagonal is only very slightly indicated at the apex of the 
wing in the shape of the foremost external triagonal spot, which 
extends from the wing-tip along the front-border, and shows the 
form of a dark-brown threesided blotch, growing fainter and of 
lighter hue from before backward. It remains separated from the 
convex blotch along the external margin by a narrow space, which 
is occupied by the well-known oblique white apical stripe, that is 
seen in so many different forms of Lepidoptera. 
In the same way the posterior triagonal spot is well-developed, 
but remains separated from the anterior one by three internervural 
Spaces, containing only faint traces of dark marginal spots. 
Bar Il is complete and well-marked, III on the contrary hardly 
visible, IV is a broad dark band, imperceptibly passing at its external 
side into the area where III] would have occurred, had it been 
visible, but very sharply traced at its internal border. “V is rather 
sharp, but does not reach the back-margin of the wing. VI is just 
indicated by a faint trace, VII on the contrary is invisible. 
On the upper side of the hindwing a broad marginal seam and 
an obscuration of the root-field are the only traces of the pattern. 
On the inferior surface the common heterocerous pattern occurs, 
viz. a design which is the same for front- and backwing, and 
betrays clear traces of reduction, when it is compared to that of 
the upper-side. For it only consists of a well-defined marginal range 
of (coalesced) spots, inwardly bordered by an irregular zig-zag-line, 
and moreover of the bars Il and III, represented by brown lines 
on a lighter ground. 
The wing-design of porcellus may rather easily be derived from 
that of syriaca, and this deduction presents a certain amount of 
probability, as the complete set of seven transverse bars is clearly 
discernible along the front-margin of the forewing. Three of these 
bars: the outward or distal ones (1, Il and IIL) reach the hind-margin. 
When I call this pattern an original one, this expression should 
not be taken in the absolute sense generally connected with it. 
