656 EXTERNAL ANATOMY OF INSECTS. 
the case in Copris, &c.; and in the Lepidoptera, if the 
former be separated from the latter, the legs will be de- 
tached with it. 
4. Location. We are now to consider the location and 
position of the legs, both in general and with respect to 
each other. And first, as has been before stated, we may 
observe that, in the hexapods with wings, the arms belong 
to the manitrunk, and are attached to the antepectus on 
each side the prosternum ; and the two pair of legs to 
the alitrunk, the mid-legs being attached to the medzpec- 
tus, between the scapularia and mesosternum ; and the 
hind-legs to the postpectus, between the parapleura and 
the posternum; and further, that the arms are opposed 
to the prothorax : the mid-legs to the mesothorax and the 
primary organs of flight; and the Aznd-legs to the me- 
tathoraa and the secondary organs of flight; though in 
some cases the wings appear to be behind the legs and 
in others before them: thus, in Panorpa, the former are 
nearer the head than the latter; but in the Libellulina 
the reverse of this takes place, the legs being much 
nearer the head than the wings: in both cases, however, 
the scapularia and parapleure run from the legs to the 
wings, but in an oblique direction ; and in Panorpa these 
pieces assume the appearance of articulations of the legs. 
In most of the apterous hexapods they appear to be 
attached laterally between the thorax and the pectus * ; 
but in the flea (Pulex) they are ventral. In this tribe the 
arms are usually stated to be inserted in the head: but 
I once succeeded in separating the head of a flea from 
* Mr. Montague describes the legs of Nycteribia, as dorsal (Linn, 
Trans. xi. 13); but Dr. Leach calls them /ateral (Samouelle, 303). 
» ON. Dict. d? Hist. Nat. xxviii. 247. 
