373 
upon the succeeding annuli. It is true that the surface of the wing 
is not divided into regular annuli in the same way as the body-wall, 
yet also its surface becomes parcelled into so-called cells by means 
of the venous system, this division showing a considerable amount 
of similarity to the first-mentioned division in annuli. One even 
might feel tempted to ascribe a certain importance to the fact, that 
in the neighbourhood of the wing-root the number of internervural 
cells is equivalent to that of the annuli of the larval segments, when 
the original number of veins in the proximal area of the wing is 
taken to be eight, (costa, subeosta, radius, medius, cubitus and three anals). 
Comparing the body-design of the convolvuli-imago to that of the 
corresponding stages of Ligustri and atropos, the similarity is obvious 
on first view, and not less striking than that of the wing-patterns. 
But entering into details, which at first sight might seem to be 
trifles without deeper meaning, a few curious features may be 
remarked, which draw the original similarity with the caterpillars 
into stronger evidence. So in ligustrt the contrast between the light 
areas on both sides of the black median dorsal line and the enlarged 
dorsal tops of the black transversal bars, is sharper than in convol- 
vuli, these broadened black tops, protracted as they are towards 
the head-side, producing the impression of a sequence of dark sub- 
dorsal spots separated by the lateral emergencies of the front-corners 
of the lightbrown subdorsal fields, in a higher degree than is the 
case in the lastnamed species. 
Likewise in ligustr, the white lateral transversal stripes along the 
frontborder of the segments are lacking, or to express it more 
correctly, the white is replaced by black, which coalesces with that 
along the back-border of the foregoing segment, the black between 
the first and the second abdominal segment being restricted to a 
subdorsal blotch. Moreover the ventral ends of the black and of the 
red transversal bands are obliquely truncated, which calls forth the 
impression of a zig-zag-line, running at a certain distance above the 
series ‘of the stigmata, which line corresponds to the system of 
diagonal stripes on the abdominal segments of the caterpillar. _ 
At the ventral side the design has remained unaltered in a much 
higher degree than in convolvuli, the dark ventral line stretching 
over the whole of the segments. At both sides of this line light areas are 
found,which at the level of the stigmata are marked off by a dark festooned 
line. On the thorax the resemblance with convolvuli is striking, and 
especially the light epipterygial band is drawn with peculiar sharpness. 
The similarity in design between the abdominal segments and the 
hindwings is still more obvious than is the case with convolvuli, 
