HEMIPTERA. 19 
ORDER VII. 
HEMIPTERA(1). 
The Hemiptera, according to our system, terminate the 
numerous division of Insects which are provided with elytra, 
and of all those, are the only ones which have neither man- 
dibles nor maxille properly so called. A tubular, articu- 
lated, cylindrical, or conical appendage curved inferiorly, or 
directed along the pectus, having the appearance of a kind of 
rostrum, presents along its superior surface, when raised, a 
groove or canal from which may be protruded. three rigid, 
scaly, extremely fine, and pointed set, covered at base by a 
ligula. These sete, when united, form a sucker resembling 
a sting, sheathed in the tubular apparatus we have just de- 
scribed, where it is kept in situ by the superior ligula placed 
at its base. ‘The inferior seta consists of two filaments which 
are,united into one at a little distance from their origin, so 
that in reality the sucker is composed of four pieces. The 
inference drawn from this by M: Savigny, is, that the two su- 
-perior setz, or those which are separate, represent the man- 
dibles of the triturating Insects, and that the two filaments of 
the inferior seta correspond to their maxillze(2); this once ad- 
mitted, the labium is replaced by the sheath of the sucker, 
and the triangular piece at the base becomes a labium. A 
true ligula also exists, and under a form analogous to that of 
the preceding piece but bifid at the extremity. The palpi 
are the only parts which have totally disappeared: vestiges 
of them, however, may be perceived in Thrips. 
The mouth of Hemipterous Insects is then only adapted for 
(1) Ryngota, Fab. 
(2) Or rather, in my opinion, to their terminal lobe, or that superior portion 
which in the Bees and Lepidoptera is prolonged into a thread or attenuated lamina, 
and reaches beyond the insertion of the palpi. 
