Bulletin - United States National Museum

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 Wytsman.
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.
Thorax
Antenna hght ochreous; long-cihate, cihations over one-half.
and tegulae with anterior half bright yellow, posterior darker fuscous,
sides of metathorax 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 bluelilac
gloss in certain lights, markings bright yellow, well defined.
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.
A
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