40 THE HEAD. 



2d. The labium^ or under lip^ is fastened to the under 

 part of the moutli and is placed between the two max- 

 illae, or under jaica. 



3d. The labial palpi^ or faeler^^ arc jointed filaments, 

 placed one on each side of the labium. 



HEAD AND JAWS OF THE TIGEK-BEETUS. 



4th. The mandibulse, or upper jaws, are a pair of 

 horizontally moving organs placed under the labium, 

 generally horny or corneous, and used for chewing ; to 

 these are often attached prominent points, which may 

 be considered as teeth, since they discharge the func- 

 tions of chewing and prehension. 



5. The maxillaB or under jaws, are two organs moving 

 underneath the upper jaws hinged on either side with the 

 base of the labium and usually parallel with it ; 

 their chief use in the chewing insect appears to be the 

 holding of the food, while being chewed, by the upper 

 jaws ; to them are attaclied the maxillary palpi, or feelers 



