HEAD, MOrTH-PARTS, ORTHOPTEHA EUPLEXOPTER.\ 281 



labium. The apex of the triangular area is applied against 

 the laterocaudal angle of the salivia. The oseula on the lateral 

 aspect forms a small membranous fold at the proximal end of 

 the hypopharj^nx. 



In jNIelanoplus (figs. 156 and 162) the parapharynx is sub- 

 globular and obtusely pointed at the distal end. The pharyngea 

 is long and slender, its caudal part extending along the ventro- 

 lateral margin of the postpharynx; the cephalic part is strongly 

 chitinized. The subgusta is deeply furrowed on the meson, and 

 constricted between the cephalic ends of the pharyngeae. The 

 paralingua is the small V-shaped sclerite ventrad of and fused 

 with the cephalic part of each pharyngea. The ventral arm of 

 the V extends ventrad and then caudolaterad into the poorly 

 differentiated linguacuta which is attached to the mesocephalic 

 end of the rectotendon of each mandible. The lingula is the 

 brownish subquadrate sclerite located slightly ventrad and 

 cephalad of the cephalic end of each paralingua. Its cephalic 

 margin is expanded and its mesocephalic end bent mesad. The 

 hypopharynx is narrowest between the distal ends of the lingulae 

 and is produced laterad and strongly convexly cephalad of this 

 constriction. There is a constriction near the distal third of the 

 hjT^opharynx where the lateral surface is produced like a shoulder. 

 This prominence caudad of the distal constriction was inter- 

 preted by Folsom ('00) as a rudimentary 'superlingua.' The 

 salivia consists of two subdivisions. The dorsal is a long strongly 

 chitinized sclerite extending obliquely from the dorsal constric- 

 tion along the ventral margin of the proximal part of the hypo- 

 pharynx. The other is a large chitinized plate on the lateral 

 and ventral aspects. The ventral part is irregular and is con- 

 tinuous with the dorsal part, with a faint suture-like furrow be- 

 tween them. It extends mesad to form a support for the salivos. 

 The ventral aspect of the hypopharynx is distinctly convex and 

 is produced into a small pocket under the salivos. The salivary 

 duct is slightly dilated and depressed immediately caudad of the 

 salivos. It extends caudad for a short distance, then bifurcates. 

 The oseula is flat under the free part of the hypopharynx, pro- 

 tects the salivos, and extends laterad, then caudad, to the 

 lingulae and paralinguae where it is continuous with the L'lbicoria. 



JOURNAL OF MORPHOLOGY, VOL. 33, NO. 2 



