118 U.S. NATIONAL MUSEUM BULLETIN 25 7 



Hindwing glossy silvery white. Cilia snow white. 



Male genitalia: Sclerotized throughout, Tegumen gently nar- 

 rowed below top. Uncus dilated apicad, bicornute. Gnathos strong, 

 point scobinate. Vinculum rather long, triangular. Valva with a 

 very broad, concave sacculus; harpe, an almost circular process, 

 reaching costal edge, with a series of strong spines along the upper half 

 of anterior edge. Anellus tube almost as long as the aedeagus, which 

 has an annular, sclerotized top with a recurved subapical tooth. 



Female genitalia: Eighth sternite sclerotized, well defined. Ostium 

 bursae and bursa copulatrix caliciform, equally sclerotized, appressed 

 to that sternite, ostium large. Ostium bursae with median portion 

 minutely punctulate. Signum normal, a rhomboidal sclerite. 



Material exammed: Luzon, Mt. Makiling (Baker), 1 cf, holotype, 

 genit. slide 5146, 4 cf paratypes; 1 9, allotype, genit. slide 5162, 2 9, 

 paratypes. 5 cf , 3 9 (USNM). Oriental Negros, Dumaguete, 390 m, 

 26.VI.1958, 1 d^ (H.E. MiUiron) (BMH). 



Metathrinca pernivis, new species 



Figures 144, 589 



Male, 12 mm. Head and thorax snow white. Antenna black; 

 bipectinate, pectinations with short white cilia; outer pectinations 2, 

 inner partly, 3. Palpus long, recurved, median segment rather 

 slender, well exceeding base of antenna, black, covered with minute 

 white scales, appearing dark grey or white in certain lights; terminal 

 segment 2/3 of median, more slender, white, appearing grey in certain 

 lights. Abdomen white, costa narrow, posterior submarginal bands of 

 orange-ferruginous spines. 



Forewing obUquely oval, moderately broad, little dilated, costa 

 gently curved at base, straight in middle, more curved before apex, 

 apex rounded, termen little rounded, rather oblique. Glossy snow 

 white. Cilia concolorous. 



Hindmng and cilia glossy snow white. 



Male genitalia: Resembhng those of Metathrinca iridostoma, new 

 species, closely, but with valva longer, more truncate, top of cucullus 

 shorter, harpe longer and less curved, with slightly shorter bristles; 

 instead of a hairy knob in the center of valva there is a dark, loose, 

 triangular sclerotized lobe. 



Material examined: Mindanao, Davao Prov., Maco, Tagum, sea 

 level, 9.x. 1946, at light (CNHM Philippine Exped. 1946-47, H. 

 Hoogstraal), 1 cf , holotype, genit. slide 5756. Closely allied with M. 

 iridostoma, new species, but with the palpus slightly longer, median 

 segment distinctly longer and grey instead of hidescent blue, and 

 with the male genitalia distinct. 



