256 ANATOMY. 



mutual wants or discoveries. But I shall enter 

 more fully into this subject when I come to speak 

 of the various uses to which the antennae are 

 applied. 



' The PALPI or FEELERS are also important or- 

 gans ; their ends are furnished with nervous 

 papillae, indicating some peculiar sense, of which 

 they are the instrument : they are four in number, 

 two emerging from the maxillae called maxillary 

 feelers, and one from each side of the labium, 

 called labial feelers. The maxillary are short 

 and without a joint, the labial long and with four 

 joints, including the two flat joints or elevators. 



The EYES, two in number, are placed in the 

 sides of the head ; they are compounds of an in- 

 finite number of hexagonal lenses, as clear as 

 crystal, and are guarded by a horny tunicle or 

 covering. This subject is however treated of in 

 Chap. XXXII. 



THE TRUNK. 



The trunk affords attachment to the organs of 

 motion. 



First, To the WINGS, which transport the insect 

 through the air ; these consist of two superior and 

 two inferior: they are membranous and trans- 

 parent, and while in a state of repose are incum- 

 bent on each other, covering the abdomen. 



Bees and various other hymenopterous insects, 



