MEEK : MOUTH-PARTS OF THE HEMIPTERA. 277 



EXPLANATION OF ABBREVIATIONS 



REFERRING TO PLATES VII TO XI. 



nt Anterior arm of the tentorium. 



c Clypeus. 



ca Crescent shaped Bclerite attached to the maxillae. 



CO Hinge connecting the mandible with the head wall. 



or Chitinous rod differentiated from the cephalic surface of the labium. 



cp (In figs. 4 and 13.) Chitinized plate for the attachment of the mus- 

 cles belonging to the salivary injector. 



02) (In figs. 11 and 14.) The chitinized plunger in the salivary injector. 



cm Muscles attached to the cervical sclerite for moving the head. 



cmx Chitinized plates for attachment of the rotary muscles of the head. 



esc Cervical sclerites. 



e and ep. . . .Epipharynx. 



/ Frons. 



h Hypopharynx, 



I Lumina. 



la Labium. 



lah (123).. .First, second and third segments of labium. 



Ic . . Chitinized labial canal. 



Ip Labial protractor. 



Ir Labial retractor. 



m Membrane connecting hypopharynx with labium. 



mc Tendon connecting the crescent-shaped sclerite with tentorium. 



md Mandible. 



ml Muscles moving the entire head. 



mr Rotary muscles of the head. 



mg Process holding the maxilla to the epipharynx and the chitinous 



plates. 



^nd}) Mandibular protractor. 



mdr Mandibular retractor. 



m,in Muscles of the injector. 



m,ds Mandibular sclerite. 



mx Maxilla. < 



mxx> Maxillary protractor. 



mxr Maxillary retractor. 



p Pharynx. 



pc (In fig. 14.) The pharyngeal canal. In other figures, the lower 



lamella of the pharynx. 



procx Maxillary process. 



s Stylets. 



sc Salivary canal. 



sd Division of salivary duct. 



sin Salivary injector. 



t Tentorium. 



tl Tip of labium. 



tp Tendons of the pharyngeal muscles. 



tm.x Tip of maxilla. 



V Valve in injector. 



z Muscle for movement of head. 



