(Photos by W. J. Lucas.)]
Except that it is generally less prominent, the head, with the various
parts thereof, is pretty much the same as in the butterflies. In a few
families, however, the "tongue" (proboscis) is only rudimentary or even
entirely absent; while in others it is very long. The Convolvulus Hawk-moth
has the proboscis of such length that it is able to reach the deep-seated
nectary of such tubular flowers as those of _Nicotiana affinis_. In the
illustration the "tongue" of the moth and the sweet-scented tobacco blossom
are shown on exactly the same scale.
Fig. 2 represents some forms of antennæ found in moths. A, {3} thickened
and spreading out towards the tip (_dilate_); B, simple, thread-like
(_filiform_) structure, without teeth, hairs, or bristles; C, fringed with
fine hairs (_ciliate_); D, fringed with fine hairs, and with longer
bristles at the joints (_setose ciliate_); E, the fringe in tufts
(_fasciculate_); F, toothed, with fine hairs on the teeth (_dentate
ciliate_); G, toothed with hairs in tufts from the teeth (_dentate
fasciculate_); H, I, with double rows of hair scales (_bipectinate_); in I
the projections are continued to the tip, and are themselves fringed with
fine hairs, giving the antennæ a very feather-like appearance--the term
"plumose" is sometimes used to describe this form of antennæ; in H the
pectinations do not reach the apical fourth, which is simple. J, the
_lamellate_, that is, the undersides of the rings or joints are made up of
minute plates.
[Illustration: FIG. 2.