292 INSECTA. 
out digitations. All those that in their caterpillar state live almost 
exposed, or in fixed domicils, several of which have at least sixteen 
feet, and which, in their perfect state, have their superior palpi very 
small, or entirely concealed, the wings more or less triangular, hori- 
zontal or tectiform, and not folding round the body, will compose the 
first eight. The last of these latter, or the eighth, is the only one in 
which the caterpillars have fourteen feet, two of them anal. If the 
same number be found in some others, then the two last are wanting. 
The two divisions, Attacus and Bombyz of the genus Phalena of 
Linnzus correspond to the four first sections. The proboscis is most 
frequently rudimental, or very small, and its two threads are not 
united. The inferior palpi, those of a small number excepted, are 
small and almost cylindrical. The antenne, at least in the males, 
are pectinated or serrated. The wings are horizontal or tectiform, 
and in several the inferior ones project beyond the others when at 
rest, and sometimes are also destitute of that bristle or bridle which 
connects them with the latter. "The thorax is always smooth, as well 
as the abdomen, and woolly. The latter is usually very voluminous 
in the females. The cocoon of the chrysalis is usually well felted and 
solid. 
Although the nocturna of the fourth section are closely allied to 
those of the preceding ones, we find a character in their caterpillars 
perfectly unique in this order: the anal feet are wanting, while all 
those of the three preceding sections have sixteen. 
The type of the first section, that of the HeprauiTeEs, is the genus 
Hepialus, (Hepiolus of some authors) of Fabricius, and the Cossus of 
the same. The caterpillars are rare, and remain concealed in the 
heart of the plants on which they feed; their cocoon is mostly formed 
of particles of the matter that nourishes them. ‘The margin of the 
abdominal annuli of the chrysalis is dentated or spinous. The antenne 
of the perfect insect are always short, and most frequently present 
but one sort of small, short, rounded, and crowded teeth. Those of 
the four others are always terminated by a simple thread; but they 
are furnished inferiorly in the males with a double line of sete. 
The proboscis is always very short, and but slightly apparent. The 
Wings are tectiform and usually elongated. The last abdominal an- 
nuli of the females form an elongated oviduct, or sort of tail. The 
caterpillars of these Insects are very injurious to several kinds of trees 
and other useful vegetable productions. 
Sometimes the antennz, almost similarly formed in both sexes, 
have but very short teeth, arranged in one or two lines. 
Hepiauus, Fab., 
Distinguished by their almost granular antenne, which are much 
mee than the thorax. ‘The inferior wings are usually destitute of 
a bridle. 
The caterpillars live in the ground, and feed on the roots of plants. 
Hi. humuli, Fab.; Harr., Exp., of Eng. Ins., 1V, a—d. The 
superior wings of the males are silver-white and immaculate ; 
those of the female yellow with red spots, 
