468 EXTERNAL ANATOMY OF INSECTS. 
expense of al] the palpi, but in the proboscis at that of 
the dabial only; and in some cases at that also of the 
mandibles or maxilla,—the former merging in the /a- 
brum and the latter in the /abium. 
ili. Antlia?.—The third kind of imperfect mouth is 
that of the Lepidoptera, which I have called Antlia. Fa- 
bricius denominates it lingua ; but as this organ has no 
analogy with the real tongue of insects, this is confessedly 
improper, and it appeared necessary therefore to ex- 
change it for another denomination : I have endeavoured 
to apply a term to it that indicates its use—to pump up, 
namely, the nectar of the flowers into the mouth of the 
insect. Ona former occasion I described to you the 
structure of this instrument; but further discoveries 
with regard to it having since been made by MM. Sa- 
vigny and Latreille, I shall here give you the result of 
their observations. ‘The former of these able physiolo- 
gists has detected in the mouth of the Lepidoptera rudi- 
ments of almost all the parts of a perfect mouth. Of the 
correctness of this assertion you may satisfy yourself, if 
you consult his admirable elucidatory plates, and com- 
pare them with the insects. Just above the origin of the 
spiral tongue or pump, the head is a little prominent and 
rounded ; and immediately below the middle of this pro- 
minence there is a very minute, membranous, triangular 
or semicircular piece ; which from its position, as cover- 
ing the base of the antlia, may be regarded as the rudi- 
ment of the upper-lip (labrum)*. On each side of the 
* Prare VI. Fic. 18. a’, b’, c’, di. b Vor. I. p. 394—. 
© Prate VI, Fie. 13. a! Savigny Anim. sans Verttbr. 1,1. 3—. 
t, 1.—ill, a. 
