INSECTA. 
343 
kind of a metamorphosis, which increases the number of legs, and 
that of the annuli of the body, correspond to the order of the Arach- 
nides anlennistes of Lamarck, The organ of sight in these animals 
is usually a mere (more or less considerable) assemblage of simple 
eyes resembling granules. The following orders compose the class 
of Insects of the same author. That of the Suctoria, which only 
comprises the genus Pulex, from its natural relations should appa- 
rently terminate the class, but as I place those Insects which are 
apterous at the beginning, this order, for the sake of regularity in the 
system, should immediately follow that of the Parasita. 
Certain English naturalists have formed nev/ orders, based upon 
the wings ; I see no necessity, however, for admitting them, that of 
the Stresiptera excepted, the name of which appears to me to be 
erroneous* * * § , and which I will call Rliipiplera^. 
In the first order, or the Myriapoda, there are more than six feet — ■ 
twenty-four and upwards — arranged along the whole length of the 
body, on a suite of annuli, each of which bears one or two pairs, and 
of which the first, and in several even the second, seem to form a part 
of the mouth. They ai'e apterous J. 
In the second, or the Thysanoura, there are six legs, and the abdo- 
men is furnished on its sides with moveable parts, in the form of false 
feet, or terminated by appendages fitted for leaping. 
In the third, or the Parasita, we find six legs, no wings, and no 
other organs of sight than ocelli ; the mouth, in a great measure, is 
internal, and consists of a snout containing a retractile sucker, or in 
a slit between two lips, with two hooked mandibles. 
In the fourth, or the Suctoria, there are six legs, but no wings§ ; 
the mouth is composed of a sucker inclosed in a cylindrical sheath, 
formed of two articulated portions. 
In the fifth, or the Coleoptera, there are six legs, and four wings, 
the tAVo superior of Avhich have the form of cases, and mandibles, and 
maxillee (a) for mastication : the inferior wings are simply folded cross- 
* Twisted wings. The parts taken for elytra are not so. See this order. 
-f- Wings folded like a fan. 
J Destitute of wings and scutellum. 
§ They undei-go metamorphoses and acquire organs of locomotion which they did 
not possess at first. This character is common to the following orders, hut in the 
latter the metamorphosis developes another sort of locomotive organs — the wings. 
The maxillffi of coleopterous Insects, in conjunction with the mandibles, usu- 
ally have this triturating function assigned to them. M. Hentz, a distinguished Ame- 
rican entomologist, Trans. Phil. Soc., Ill, part ii, p. 458, is of the opinion that in 
many cases the maxiilre must be considered as mere appendages to the tongue, and 
that their office is to assist in deglutition, seldom serving to grind- or lacerate, except 
in the Mdolonthidte, RideUdce, and some others, where there seems to be a departure 
from their primary use. In corroboration of this idea he adduces the configuration 
