578 



two curved spines arise from near the apex, one on each side, and curved 

 over dorsal aspect; just basad of these there is a small process. 



Light green or stramineous, darker in old specimens; abdomen darker 

 green; pygofer, anal segment and styles brown; a round black spot at 

 lateral margin of the pronotum beneath the eyes. 



Tegmina hyaline, veins broM'n, costal membrane, costal cell, the 

 very narrow subcostal and apical subcostal cells brown with a darker 

 mark at apex of subcostal cell and base of E2 and E3, the apical margin 

 fuscous to the apex of clavus; wings hyaline, veins dark, hind margin 

 slightly fuscous. 



Female. Length 5 mm., tegmen 9 mm. Similar to male. Pygofer 

 and anal segment dark brown, ovipositor liglit. 



Described from two males and three females from Tutuila, 

 Samoa, elevation 1200 feet (Kellers, April to December, 

 1918). Type No. 1017. The two males have a small cross- 

 vein at the base of R2 — 3, which is absent in the female 

 specimens. This species differs from P. marginata Montr., 

 by having no light spots in costal membrane and no color 

 bands on head and thorax. The genital styles of P. marginaia 

 have the apices hammer shape, being more bluntly pointed on 

 the outer corner of apex and considerably and roundly pro- 

 duced on inner corner. 



Plestia anomala sp. n. Fig. 5. 



Male. Length 3.7 mm., tegmen 7 mm. Female. Length 5 mm., tegmen 

 8 mm. The genital styles of this species are slightly narrower than 

 P. kellersi, and the small process basad of the curved spine on the aedea- 

 gus is longer and thinner. In color and general build, it is the same as 

 P. Tcellersi, except for one point in the venation of tegmina. Tn this 

 species there is a submarginal row of cross-veins which is missing in 

 P. Tcellersi, and the other two species of the genus. This character is 

 enough to base a genus upon, according to the characters used in the 

 family. But apart from this character the two species are so closely 

 allied that I cannot agree in placing them in different genera. 



It would be of great interest to study these two species and 

 see if they interbreed and the result of interbreeding. 



Described from two males and two females from Tutuila, 

 Samoa {Kellers, April to December, 1918). Type No. 1018. 



