372 
In my opinion the transverse markings of the dorsolateral fields 
might be ascribed to the original distribution of the colour in dorso- 
ventral bars, corresponding to the eight annuli which enter into 
the composition of each segment; probably the white represents the 
first annulus, the pink area the following four, the black the poste- 
rior three, but in convolvuli the limits of the single rings are indis- 
tinct. As we shall see, this division can really be traced in imagines 
of other Sphingids. 
Now comparing this pattern of the abdomen to that of the thorax, 
we remark that the grey ground-colour along the dorsal side of 
the latter, provided with three darker longitudinal striae on both 
sides of the middle-line, evidently may be considered as a broadening 
of the dorsal markings of the abdomen. Over the root of the wings 
runs a greyish-white streak of long, soft hairs, forming a continuation 
of the white transversal markings of the abdominal segments, 
especially of their dorsal part, which on the second segment already 
has the shape of an isolated round white blotch. This light stripe 
over the wing-root (epipterygial stripe) should probably not be 
considered the homologon of the white subdorsal line on the thorax 
of the caterpillar. 
In the third place an evident connection exists between the markings 
on the upperside of the hindwing and those on the dorsal side of 
the body, as well of the thorax as of the abdomen. The said wing- 
design consists of dark spots arranged in bands on a lighter ground. 
These bands apparently stand perpendicularly to the longitudinal axis 
of the body, thereby agreeing in position with the anterior three 
black transversal rings on the abdomen. As a matter of fact however 
they are not transverse but longitudinal bands, because they run 
from the anterior towards the posterior border of the wing, the 
apparent transverse position only being a consequence of the round- 
ing off and reduction of the hindwings, which in Sphingids has 
taken place in an extreme degree. 
When as described before, the hindwings are projected upon the 
lateral walls of the thorax, the dark bands may be drawn on the 
wing-fields as longitudinal lines, viz: in an oro-eaudal direction. In 
this way the similarity with the lateral design of the abdomen, 
which at first aspect is so striking, withdraws to the background, 
or, rather, is reduced to its real proportions. 
Indeed, as well as the design on the annuli of the thoracal segments 
of the convolvuli-caterpillar, that on the wings is seen to consist of 
dorso-ventral rows of alternately dark and light spots, which are 
arranged in longitudinal chains, by their situation at the same level 
