_Does the Form-relationship of the Larva coincide with that of the
Imago?_ p. 432.
Family groups, 432. Families frequently completely congruent, 435.
Exception offered by the _Nymphalidæ_, 435. In transitional families
the larvæ also show intermediate forms, 441. Genera; almost completely
congruent; the Nymphalideous genera can be based on the structure of
the larvæ, 444. So also can certain sub-genera, as _Vanessa_, 445.
Incongruence in _Pterogon_, 450. Species; incongruence very common; _S.
Ocellatus_ and _Populi_, 451. Species of _Deilephila_ show a nearer
form-relationship as imagines than as larvæ, 454. Systemy not only the
expression of morphological relationship, 455. Varieties; incongruence
the rule; seasonal dimorphism; climatic varieties; dimorphism of
caterpillars; local varieties of caterpillars, 456. Result of the
investigation, 458. Causes of incongruence, 460. A phyletic vital force
does not explain the phenomena, 461. This force is superfluous, 464.