ORTIIOPTKRA OF INDIANA. 



131 



The short phite (cly), below or in front of the epicranium, is the 

 '■'dypeus." Below this and hinged to its front edge is a movable flap 

 known as the "hilrnim (Ibr) or upper lip, to which are attached a 

 pair of jointed "labial palpi." This forms the roof or covering of 

 the. front part of the mouth, within which are the large, black-tipped, 

 toothed Jaws or "mandihles" (md), which are so attached to the epi- 

 cranium as to move only in and out or to and from a median line. 

 Beneath the labrum and arched over the tongue will also be found a 



.fiiOc:«i\Dda. 





;? 



Fig. 4. External anntoray of a locust, showing the head and thorax disjointed. 

 (After Packard.) 



pair of accessory jaws, the "maxillai" (mx), each of which is composed 

 of three pieces, the most important, used in classification, being the 

 jointed "maxillary palpus." 



