192 U.S. NATIONAL MUSEUM BULLETIN 257 



Imma basiflava. — Meyrick 1906, Trans. Roy. Ent. Soc. London, p. 190; 1913, 

 in Aurivillius, Lepidopterorum Catalogus, pars 13, p. 27; 1915, in Wyts- 

 man. Genera Insectorum, fasc. 164, p. 10. 



Distribution: Philippine Is., Luzon. 



Lectotype, cf, herewith selected, genit. slide 5873 (SMF). 



Male genitalia: The intersegmental membrane between segments 7 

 and 8 forming long, semi-elhpsoid pair of menses and rostrad of these 

 a pair of long coremata, retracting into slender membranous tubes. 

 Tegumen vnth short pedunculi and a membranous semioval top. 

 Tuba analis large. Vinculum narrow, erected. Anellus strong, 

 bivalvous, lobes short and rounded. Valva elongate, lengthwise 

 concave; sacculus prominent mesad, membranous. Cucullus top 

 bifid, a ventral sclerotized and a dorsal, bristly, slender process. 

 Aedeagus httle curved dorsoventrally, slightly curved laterally, top 

 more sclerotized. 



Imma chrysocosma, new species 



Figures 295-296, 666 



Male, 20 mm. Head bright yellow, forehead paler. Palpus 

 appressed to face, slightly exceeding base of antenna; bright yellow. 

 Antenna hght ochreous; long-cihate, cihations over one-half. Thorax 

 and tegulae with anterior half bright yellow, posterior darker fuscous, 

 sides of meta thorax yellow. Legs yellow, posterior femur glossy grey; 

 median tibia dilated with rough spiny scales. Abdomen fuscous with 

 whitish reflections, segments 1-4 of venter light yellow, dorsum pale 

 yellow at base, with a yellow median streak on tergites 5-7, anal tuft 

 yellow in middle. 



Forewing elongate-subtruncate, dilated and rather narrow^, costa 

 straight except toward apex, apex moderately rounded, termen 

 convex; veins 7 and 8 stalked, 8 to costa. Dark fuscous with blue- 

 lilac gloss in certain lights, markings bright yellow, well defined. A 

 clavate patch along less than anterior half of costa, extending over 

 upper half of base of wing, posteriorly dilated into a rounded-triangular 

 tooth almost to middle of wing, lower edge of patch concave, posterior 

 edge convex; a slightly oblique erect semioval moderate patch on 

 2/3 of costa; faintest markings of lilac-blue iridescence: a short 

 transverse streak along closing vein and a marginal line along posterior 

 foiu-th of costa, in apex and along termen. CUia dark fuscous with 

 whitish tips. 



Hindwing and cilia dark fuscous, dorsum with a narrow pale yellow 

 streak, dorsal ciUa pale yellow; a well-defined bright yellow central 

 patch, shaped as follows: upper edge straight, along upper half of cell 

 to beyond closing vein, with a rising tooth at end, posterior edge 



