374 
because in /igustri the groundeolour of the hindwings plays into a 
rose-red hue, especially in the neighbourbood of the wing-root, this 
red even running over into the root of the forewings. The black 
wingbands lie more exactly in the prolongation of those of the anterior 
abdominal segments and show fewer traces of their origin by the 
coalescence of a row of intervenous spots. 
All the above-mentioned resemblances are equally found in atropos, 
only the hues and the variegations being different. When we start 
from the abdomen, the dorsal stripe on its back corresponds to that 
of the caterpillar as well in the V-shape of its segments as in its 
blue shade. The rose-red colour of convolvuli and ligustri is replaced 
by stark-yellow and the dorsal borderlines between the yellow lateral 
areas on the abdomen and the blue dorsal patches run in the same oblique 
direction as the lateral sides of the V-shaped elements of the dorsal 
design in the caterpillar. At the ventral side of the abdomen the 
black design along the frontborder of the segments, at least of the 
anterior ones, is well developed, and shows well-marked enlargements 
along the hypostigmal and subventral lines, pointing to the presence 
of series of spots at those levels. 
As well as in /igustri the light (in atropos yellow) hue of the lateral 
walls of the metathorax is continned not only on the hindwings, but 
also on the root of the forewings, though it does not reach the 
front-margin of these latter. 
The cranial design on the dorsal side of meso- and metathorax may 
be easily traced back to sets of dark spots on a light ground: two 
pairs of these spots standing on the meta-, one on the mesothorax, 
just as is found in the caterpillar, and in the same way in the 
imagines of many other Sphingids as well as in those of other 
Heterocerous families. The contour of the skull-image corresponds to 
the dorsal or medial dark longitudinal thoracal line, which forms the 
borderline of the median area of the thorax, in the same way as in 
convolvuli and ligustrt. The more ventral or lateral thoracal-line is 
likewise present in atropos, and next to it also the epipterygial light 
streak, though here this latter does not show the grey shade of 
convolvuli or the white of Ligustri; but a dark bluish grey, which 
of course renders it much less conspicuous. 
Lastly comparing the three stages of Chaerocampa celerio, as well 
with each other as with the corresponding stages of the three above- 
mentioned Sphingids, we meet again with all the already remarked 
peculiarities, but here they are in some regards more complete and 
better pronounced, in other points more original, in still other on the 
contrary more modified, either in a higher degree or in a different way. 
