292 PERCY SLADEN TRUST EXPEDITION 



72. Acrocercops rhombocosma, n. sp. 



$. 8 mm. Head white. Palpi white, second joint loosely rough-scaled beneath 

 with blackish median ring, terminal joint with black basal ring. Abdomen grey, on 

 sides white obliquely striped with dark fuscous. Legs white ringed with dark fuscous. 

 Forewings very narrowly elongate, moderately pointed ; fuscous, apical third suffused 

 with brownish-ochreous ; two moderate angulated white fascise anteriorly, interrupted 

 in middle ; a third fascia in middle, more widely interrupted ; a large oblique-triangular 

 white spot on costa about f ; an oblong white spot on dorsum beyond this ; small 

 opposite costal and terminal white spots towards apex ; an elongate suffused black apical 

 spot : cilia white, with basal and apical thirds dark grey, towards tornus greyish. 

 Hindwings dark grey ; cilia grey. 



Mahe", Cascade Estate, 1000 feet, in February ; one specimen. 



Gracilaria Haw. 



73. Gracilaria proslicta Meyr. 



Mahe, Port Victoria, in February ; one specimen. A South African species, probably 

 introduced. 



Macarostola Meyr. 



74. Macarostola parolca, n. sp. 



$. 11 mm. Head and thorax pale ochreous mixed with whitish. Palpi with 

 appressed scales. Abdomen white, towards base greyish, posteriorly with a lateral groove 

 rilled with pale yellowish scales. Posterior tibia? with short dense scales above. Fore- 

 wings extremely narrow, short-pointed, obtuse ; whitish sprinkled with dark fuscous, 

 appearing to indicate oblique striga? from costa and dorsum, posteriorly distinctly marked 

 with oblique white strigae from costa and dorsum separated by blackish scales, on termen 

 towards apex with a blackish marginal streak, on costa before apex with a small blackish 

 spot. Hindwings dark fuscous ; cilia grey. 



Mahe\ Anonyme Island, in January ; one specimen. In bad condition, description 

 therefore incomplete, but it should be easily recognisable by structure of abdomen 

 and legs. 



Plutellidse. 



Argyresthia Hueb. 



75. Argyresthia lustralis, n. sp. 



,£$. 9 — 11 mm. Head, palpi, and thorax white, shoulders narrowly brownish. 

 Abdomen whitish-grey. Forewings elongate-lanceolate; 7 and 8 separate; brownish 

 strigulated with blackish; a broad snow-white streak occupying dorsal half of wing, 

 attenuated posteriorly, reaching to near apex, cut somewhat beyond middle of wing 

 by a slightly oblique dark fuscous bar, and upper edge notched with dark fuscous 

 midway between this and apex; a small dark fuscous apical spot: cilia pale brownish, 

 towards tornus whitish, round apex with tips dark fuscous. Hindwings grey; cilia 

 ochreous-grey-whitish. 



