580 



Light green turning to straw color or light brown in older specimens. 

 Tegmina and wings hyaline, veins green or yellowish brown. 



Female. Length 7.5 mm., tegmen 7 mm. Pregenital plate with a 

 semi-quadrate emargination on the hind margin, wider than deep; anal 

 segment conical, short, anus at apex, ventral apical edge not much 

 produced. Color similar to male. 



Described from six males and six females from Niiie or 

 Savage Island (Kellers, August 6, 1918). Type No. 1020. 



This species is of interest because it stands between the 

 type species and Rhinodictya Kirk. Melichar's tribe Peggiogini 

 for those Tropiduchidae having elongated heads I think is a 

 purely artificial one. Vaniia, Leptovanna and Rhmodictya are 

 closely allied, but Peggioga is nearer to Xitmicia. 



The condition of the genital styles in this family is of 

 interest. On some genera, i. e. Ommatissns loufouensis Muir, 

 these organs are symmetrical and separate with their bases 

 near together ; the penis is surrounded by a ring from which 

 projects a pair of long, slender processes nearly as long as 

 the long, thin, tubular, penis. In Tatiibinia forniosa Kirk, and 

 allied genera the genital styles are symmetrical, but their bases 

 are amalgamated so that they act as a single organ ; the penis 

 is partly surrounded by a sheath. In Vanua and allied genera 

 the genital styles are joined together to the apex and form 

 a single asymmetrical organ ; the penis has no surrounding 

 sheath or homalogous structure. We also find a corresponding 

 modification of the tegmen. In Ommatissus the venation is 

 simple and there is no costal area; in Tambinia the tegmen 

 is broader, the venation more numerous and there is an 

 indication of a costal area. In Joanna the tegmen is broad, 

 there is a large costal area with cross-veins and the venation 

 is much more numerous. This would indicate that the primitive 

 type had a tegmen with a simple venation without costal area 

 and a complex aedeagus with a penis surrounded by a more 

 or less complex structure, and two genital styles which were 

 symmetrical. 



