94 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL, 1 37 



In the description of the phallic organ of MareUia rcniipes that 

 follows and in the corresponding figures, the nomenclature of Snod- 

 grass (1935a) has been used. In order to facilitate its comparison 

 with the phallic complexes of other Acridoidea as described by Dirsh 

 (1956), the nomenclature of that author is given in parentheses. 



The phallic organ of MareUia protrudes from the floor of the genital 

 chamber when in its retracted position (fig. 20 A). The membrane 

 that forms this floor (ectophallic membrane) covers its basal part, 

 being folded at its distal end in what is called the basal fold (Bf), 

 under which emerges the apical part of the aedagus (Acd). On this 

 membranous cover is the sclerite known as the epiphallus (Epph). 



The epiphallus of MareUia remipes (fig. 20 A, B, C, D, Epph) is 

 fairly similar in form to the same sclerite in the only other genus of 

 the family, Paulinia, as described and figured by Radclyffe-Roberts 

 (1941) and Dirsh (1956). It has rather large lateral lobes (lateral 

 plates) {h) and a pair of anterior processes (ancorae) (;') that, unlike 

 those of Paulinia which form a part of the epiphallus, are connected to 

 it only by membrane. On the posterior part of the epiphallus, there 

 is a pair of raised, crestlike posterior processes (lophi) (k) which 

 extend along its posterior margin and nearly meet on the median line. 

 No separate oval sclerites can be seen. These sclerites are present in 

 Paulinia, and a study of the muscles of MareUia might reveal that 

 they are incorporated in the lateral lobes of the epiphallus. 



A peculiar feature of the floor of the genital chamber (ectophallic 

 membrane) in MareUia is the presence of a large sclerite posterior to 

 the epiphallus, which is here called the dorsal sclerite of the ectophal- 

 lus (dsE). In the retracted phallic organ (fig. 20 A, B, dsE) it 

 covers hoodlike the posterior processes of the epiphallus (lophi) 

 (C, k). Its anterior margin is always definite, being molded on the 

 shape of the posterior margin of the epiphallus, while its posterior 

 margin weakens gradually into membrane, showing variable contours 

 in different individuals. In order to extend the phallic organ, it is 

 necessary to lift this sclerite to dislodge it from the epiphallus. Then 

 it can be seen that it is separated from the epiphallus by a considerable 

 stretch of membrane (see fig. 20 C, D, dsE). 



The aedagus (A, B, Acd) is, as usual, divided into a ventral lobe 

 (A, D, vl) and a dorsal lobe (D, dl). The ventral lobe is almost 

 entirely membranous but shows two definitely sclerotized areas in the 

 form of elongate, curved lateral sclerites (C, D, Is) along its lateral 

 edges. 



The dorsal lobe of the aedagus (r) appears to be formed in MareUia 

 by the confluence of several parts which form two lateral halves of a 



