MICROLEPIDOPTERA OF PHILIPPINE ISLANDS 117 



facies show that all belong to the same natural group. Therefore, I 

 prefer to mclude them in Metathrinca, after a slight extension of the 

 concept of this genus, instead of erecting a new genus which would 

 be borne by the neuration alone, but not by the genital characters. 



Antenna long-pectinate in male, pectinations biciliate. 



Forewing with vein 2 from weU before angle of ceU or absent, veins 

 3 and 4 stalked from angle, 5 closely approximated at base, slightly 

 converging with 6 posteriorly, closing vein between these veins absent 

 or very weak, 7 and 8 stalked, 7 to termen or costa, 9 absent. 



Male genitalia with tegumen moderate, uncus of diverse width, 

 bicornute, gnathos strong, porrected, hook sometimes scobinate. 

 Valva elongate or rounded, sacculus ending in a cm'ved harpe, being a 

 process of diverse length, appressed to disc of valva and bristled along 

 inner edge. Anellus tubular, dUated at base. 



Female genitalia little differentiated. The eighth segment more or 

 less sclerotized and bristled, with diversely shaped caudal and rostral 

 edges which provide specific differences. Signum, a transverse, 

 concave sclerite with denticulate edges. 



Key to the Philippine Species of Metathrinca 



1. Palpus with median segment pure white . . . M. coenophyes, new species 

 Palpus white, but appearing blackish or blue in certain lights 2 



2. Palpus white, in certain lights luminescent blue. 



M. iridostoma, new species 

 Palpus white, in certain lights appearing blackish 3 



3. Median segment of palpus far exceeding base of antenna, terminal segment 



half median M. sinumbra, new species 



Median segment of palpus just exceeding base of antenna, terminal segment 

 longer than half median M. pernivis, new species 



Metathrinca iridostoma, new species 



Figures 154-155, 159, 586 



Male, 17-18 mm.; female, 16-17 mm. Head and thorax glossy 

 snow white. Antenna in male thickened, white, pectinations black, 

 2%, in female white, slender, minutely ciliated. Palpus in male with 

 basal and median segments strongly iridescent violet blue, greyish or 

 completely white in certain lights, apical segment under 1, pure white; 

 palpus in female longer and more slender; median segment iridescent 

 grey. Abdomen glossy white, tergites with bands of spines showing 

 through, fuscous golden. 



Forewing with vein 2 present, vein 7 to termen; with costa gently 

 curved along basal fourth and towards apex, hardly concave in middle, 

 apex tolerably pointed, termen straight, moderately oblique. Snow 

 white, with a silky gloss; basal fourth of costa with a narrow marginal 

 fuscous line. Cilia white. 



