Notes in 1887 upon lepidopterous larve, éc. 561 
Lepidoptera possess distinct traces of ten abdominal 
segments, that there are clear indications of two 
segments behind the 8th abdominal,—the last seoment 
which bears a spiracle. These two rudimentary seg- 
ments are clearly separated from each other in Aglia, 
and in many other larve, by a distinct constriction, 
parallel with that which separates them from the 8th 
abdominal segment. Each of these two additional 
segments is further emphasised by the possession of a 
pair of strongly-marked tubercles unmistakeably homo- 
logous with the 1st tubercles already described upon 
other abdominal segments. Similar homologies ex- 
tending to other tubercles also can be traced in other 
larve : (see, for instance, the structure of these parts in 
a Sphinx, a Noctua, and a Pyrale, as shown in Plate 
XV., fig. 6, Plate XVII., figs. 8 and 9, respectively). 
But the distinctness of the 9th and 10th abdominal 
segments was especially impressed upon me in Aglia, 
because of the characteristic structure and appearance of 
the Ist tubercles, which are repeated upon each of them. 
(See also the accurate representation of these parts in 
many South American larve by W. Miller ‘ Sidameri- 
kanische Nymphalidenraupen,’ Fischer, Jena, 1886, 
Plate I.). 
The head of the larva is green and rounded, and bears 
a few scattered hairs in this and all other stages. The 
head thus possesses a very generalised shape and 
appearance, like that of the majority of Sphinx larve, 
and like the young form of those Sphingide in which 
this part has a peculiar and specialised shape in the 
older stages (Sphinx and Smerinthus). 
Another very remarkable resemblance between Aglia 
and the Sphingide is seen in the characteristic Sphinz- 
like attitude assumed by the former. This attitude is 
assumed for the whole of larval life, but it is especially 
well-marked in the 1st stage, and I have noticed the 
same fact in Sphingide. The young Aglia larva always 
rests on the under side of the leaf, stretched along the 
midrib, or one of the chief lateral veins, exactly as in 
the young Sphinx or Smerinthus. No one of the many 
points of resemblance between these larve and the 
Sphingide so greatly impressed me as the absolutely 
characteristic Sphina-like attitude which they invariably 
assumed at rest. 
