MICROLEPIDOPTERA OF PHILIPPINE ISLANDS 81 



veins strong, upper halfway between 10 and 11 to base of 7, lower 

 from base, running close along upper edge of cell, thence strongly 

 sinuate, to just below base of 5. 



Hindwing with a cubital pec ten; 2 from before middle of lower 

 edge of cell, 3 and 4 short-stalked, 5 closely approximated at base, 

 G and 7 separate, closely approximated towards base. 



Male genitalia peculiar, with a bipartite long and porrect uncus 

 and a long hairy basal process of the costa of the valva, as described 

 with the species. 



Type species: Costosa allochroma, new species (cf). 



A specialized form of obscure affinity, apparently belonging to 

 the tribe Olethreutini. 



Costosa allochroma^ new species 



Figures 69, 114-115, 550 



Male, 19 mm. Head bright ochreous, face whitish, tufts on vertex 

 pressed together to form a high keel, ochreous fulvous. Antenna 

 ochreous tawny. Palpus ochreous orange. Thorax fuscous tawny, 

 anteriorly suffused with ochreous, shoulder ochreous yellow, tegula 

 whitish touched mth pink with pale violet reflections, anteriorly 

 suffused with ochreous; a posterior loose tuft whitish pink with pale 

 violet reflections. Abdomen hght greyish fuscous, anal tuft ochreous 

 orange. 



Forewdng rather broad, truncate, costa considerably curved an- 

 teriorly, little curved before apex, apex roimded-rectangular, termen 

 straight, Uttle obHque, rounded beneath. A large, irregularly semi- 

 circular patch, occupying less than median half of costa and almost 

 reaching middle of vein lb; this patch pale violet pink, on posterior 

 half becoming deeper pinkish purple and suffused with ferruginous; 

 remainder of \^dng bright ochreous yellow along middle of disc, 

 towards anterior part of dorsum gradually becoming oUve grey, 

 towards costa, except at base, reddish ferruginous; apical sixth 

 forming a conspicuous well-defined ochreous whitish triangle, sUghtly 

 suffused with ferruginous anteriorly; its lower edge well defined, 

 straight, bordered below by reddish suffusion which extends down- 

 wards, along termen, halfway towards cell; terminal edge suffused 

 with reddish purple, this color sHghtly dilated on veins, and forming 

 two small dots: on ends of veins 6 and 7, respectively, on the pale 

 apical patch. Cilia greyish olive in torn us, purplish violet along 

 lower half of termen, whitish along upper half. 



Hindwdng rather dark, glossy grey, becoming fuscous bronze on 

 posterior half, 2/3 of costa whitish grey. Cilia fuscous grey with 

 a pale basal line and a darker grey subbasal fascia, cilia in apex 

 whitish throughout. 



