44 SMITHSOXIAX MISCELLANEOUS COLLECTIONS VOL. 94 



second valvulae are small (C, 2VI) as in Acrididae and are supported 

 by the anterior intervalvula (aiv). The first and third valvulae, how- 

 ever, are longer and slenderer than in the typical acridid ovipositor, 

 and the apodemes are relatively short. Basivahailar sclerites are ab- 

 sent in Teffigidca. but Walker (1919) describes and figures basivalvu- 

 lar sclerites associated with the first valvulae in Acrydium ornatuui. 

 and Chopard (1920) shows a lateral sclerite (pileolus) at the base 

 of the first valvula in Paramastax lacta. Walker describes also in 

 Acrydium a sclerite interposed between the liase of the third valvula 

 and the lower edge of the ninth tergum, which he regards as a valvifer. 



The ovipositor of the tridactylid genus Rhipipteryx, as Walker 

 (1919) observes. " is remarkably similar to that of the Acridoidea." 

 The female abdomen of R. bioUeyi is elongate and slender. The last 

 unmodified segment is the seventh (fig. 19 A, VII). The eighth seg- 

 ment, which is partly concealed within the seventh, has its tergum di- 

 vided into two lateral plates by a median membranous area of the 

 dorsum (A, B, VIIIT). The spiracles of this segment lie in the lower 

 parts of the tergal plates. The tergum of the ninth segment (A, IXT) 

 consists of two widely separated lateral plates (E, IXT), the anterior 

 dorsal angles of which (C, E) are produced into a pair of slender 

 arms invaginated beneath the dorsal membrane of the eighth segment. 

 The tergum of the tenth segment (F, XT) is broken up into two large 

 lateral tergites and a group of three small dorsal tergites. The lateral 

 tergites extend forward between the arms of the ninth tergal plates, 

 where they are united with each other anteriorly. The eleventh seg- 

 ment is represented by a shield-shaped epiproct ( F, Eppt), and two 

 large projecting paraprocts (Papt) bearing each a terminal lobe 

 (papfl). The cerci (Cer) arise laterad of the epiproct at the bases of 

 the paraprocts. 



The exposed part of the ovipositor of RJiipipteryx biolleyi consists 

 of four elongate conical processes (fig. 19 A, Ovp), which, as in 

 Acrididae and Tetrigidae, are the first and third valvulae. Each ventral 

 first valvula (C, iVl) has an accessory tooth on its outer surface and 

 a large lateral basi valvular sclerite («) at its base. The latter appears 

 on the side of the abdomen as a prominent plate behind the eighth 

 sternum (A, a). The dorsal third valvulae (C, jF/) are somewhat 

 longer than the ventral valvulae, and each is supported on the distal 

 margin of the lateral tergite of the ninth segment (IXT), to which 

 it is articulated ventrally (E) by a condyle of the latter. Below and 

 between the bases of the dorsal valvulae are two small intermediate 

 second valvulae (E, ^Vl), united at their bases bv the anterior inter- 



