s. 
T his very numerous and various clafs confifts of fmall animals, 
breathing through lateral fpiracles, armed on all fides with a 
bony flcin, or covered with hair ; furniflied with many feet, aftd 
moveable antennoe or horns, which projetfl from the head, and are the 
probable inftruments of fenfation, , , r r 
They are deftitute of external nojirlh and tarst though lome ot 
them evidently enjoy the fenfes of hearing an4 fmell. 
The eyer are ufually 2, fomctimes more, without eyelids, and rarely 
placed on a moveable peduncle. 
The 2 antenna are placed on the head, ufually before the eyes, are 
compofed of an indefinite number of articulations, and convey an un- 
known fenfation, probably that of the touch. 
The /rf /err are fenforial, moveable, affixe4 to the mouth, generally 
4 , fometimes 2 or 6, and confift of 2, 4 or 3 joints. - . 
The niouth is generally placed beneath the head, fometimes m the 
breaft, and in a few is wanting ; the jaws are tranfyerfe and move- 
able laterally. 
The flemmata are 3 fhining convex fpots placed on the crown. 
The is placed between the head and abdomen, fupported by 
th.e feet, with the thorax above, behind which is Oitfcutelor ejcutchtony 
and the Jlernum and hreaji bep^ath, 
The abdomen is ufually annulate with 5 fegments, perforated at the 
fides with 5 fpiracles or breathing holes, with the bach above, ^ the 
belly beneath, and is terminated by the tail, which is fometimes 
armed with a fting. 
The wings are 2 or 4, the upper ones are often cruftaccous Ihells, 
covering the lower; fometimes femicruftaceous wing cafes, or of a 
fubftance between the membranaceous wings and cruftaccous fhells. 
The legs confift of 3 diftinft divifions, the thighs, lhanks, and tarfi 
which are articulate and terminated by nails ; fome have a handf or 
chelate kind of claw with a moveable thumb. 
The poifers arc compofed of a head affixed to a fmall pedicle, and 
placed under the wings pf the dipterous order, or fuch as have only 
2 wings. 
C L A S S V. 
INSECT 
