NATURAL THEOLOGY. 



347 



six long legs instead of fourteen feet. In another 

 case we see a white, smooth, soft worm turned 



state of existence ; and thus, of course, in some instances, where 

 there is but little difference between the habits of the larva and 

 those of the perfect insect, there is likewise but little difference in 

 the structure of the mouth, as, for instance, in locusts, grasshop- 

 pers, and cock.oaches. 



In the butterfly tribe the maxillae or under-jaws of the caterpil- 

 lar become in the perfect insect elongated into two lubes (see 

 Cut,) which may be joined together at the pleasure of the animal, 

 by means of projecting ridges (furnished with a sort of hook some- 

 what like the laminae of feathers,) in such a way as to leave a 



HUMBLE BEE. 



a, a, mandibles ; c, c, maxillary palpi ; 



b, b, maxillae ; 



d, d, labium ; 



BEE. 



e, e, labial palpi; 

 /, tongue . g, neck, 



third tube between the two. It is through the central tube that 

 the nectar is pumped or sucked up ; the two outer tubes Reaumur 

 imagines are for the reception of air ; if this be the case, it may 

 possibly be that air which is discharged from the central tube to 

 create the necessary vacuum. The mandibles, or upper jaws, and 

 other parts conspicuous in the caterpillar, are to be found only in 

 ft rudimentary state in the butterfly, — yet they do exist. 



