Readio: Ovipositors of Cicadellid.f.. 219 



Between the inwardly projecting processes is a round, small, chi- 

 tinized piece. The pleura are entirely membranous, and in the 

 pleural membranes, opening ventrally, are the spiracles of the first 

 segment. These are larger than those of the other abdominal seg- 

 ments. The sternum consists of a curved, lightly chitinized caudal 

 sclerite extending for nearly the entire width of the segment, and of 

 a membranous cephalic portion connecting with the metatliorax. 

 The chitinized portion has along its cephalic border two pointed 

 projections which point mesad. 



The tergite of the second segment consists of a simple, linear, 

 chitinized sclerite which extends nearly the entire width of the seg- 

 ment. It is about one-third the length of the third tergite. The 

 pleura are represented only by pleural membranes in which the 

 spiracles of this segment are located. The spiracles open dorsally 

 and appear to be in the membrane laterad of the second tergite. 

 The sternum of segment two is a curved, chitinous piece extending 

 the entire width of the segment. 



Segments three, four, five and six have distinct and complete 

 terga, sterna and pleura. The terga are arched and form the dorsal 

 and lateral surfaces. The ventral surface is formed by the pleura, 

 which are subrectangular and longer than wide, and by the sterna, 

 which are also subrectangular, but wider than long. Each pleuron 

 bears a spiracle in a cephalomesal position. The fourth segment 

 is slightly longer than the third, and the fifth and sixth are about the 

 same length and longer than the fourth. 



Segment seven is also complete. The tergum and pleura are the 

 same as in the preceding segments. The sternum forms the sub- 

 genital plate and is commonly called the last ventral segment. Its 

 lateral margins converge caudad and its caudal border bears a broad 

 but shallow indentation along its mesal half. Dorsad of the sternum 

 of segment seven is an invaginated pocket in which the bases of the 

 valves of the ovipositor are located. Its ventral side is formed by 

 the apical portion of the seventh sternum and a membrane arising 

 from the dorsal surface of this sclerite and extending cephalad to 

 its base. The dorsal side of the pocket is formed by a membrane 

 which is continuous with the membrane of the ventral side, and 

 which extends caudad to the eighth sterna with which it connects. 

 The greater part of this dorsal membrane is strongly chitinized, but 

 medially it is apparently divided by a narrow, clear line which ex- 

 pands apically into the entirely membranous apex connecting with 



