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Cotachena brunnealis sp. nov. (Figs 1, 4, 6 )
Male. Length of forewing 11mm. Labial palpus blackish fuscous dorsally,
white at base ventrally. Maxillary palpus blackish fuscous. Frons pale
fuscous. Vertex yellow, roughly scaled. Antenna pale yellow. Abdomen dorsally
pale yellow or pale fuscous, with whitish short posterior fringe at each
segment, the coloration of abdomen ventrally paler than in dorsal surface.
Legs silvery white, except for forelegs tinted with pale fuscous in their
outer surface. Ground colour of forewing: above dull yellowish brown, except
for tornal area, costal portion narrowly and slightly tinted with pale
yellowish brown. Antemedial line inconspicuous, pale fuscous, straightly
oblique outward. A quadrate semihyaline mark placed in cell. A small roundish
semihyaline mark below vein CuA2. A large crescent-shaped semihyaline mark
extending from costa to vein M2, and its outer edge slightly indented.
The above-mentioned three semihyaline marks narrowly edged with fuscous
on outer and inner edges. Postmedial line pale fuscous, outwardly curved
from vein M2 to CuA2. Cilia dirty yellow. Ground colour of hind wing above
pale yellow. A pale fuscous spot in cell. Postmedial line pale fuscous,
outwardly curved from vein M, to CuA,. Cilia more or lcss paler than in
forewing. Wings beneath almost as above, but maculation and lines weaker.
Female unknown.
Male genitalia (Figs 4, 6). Uncus relatively broad,
parallel-sided, apical margin narrowly rounded, with more or less long setae
dorsally. Transtilla a wide plate, meeting medially, its posterior margin narrowly
sclerotized. Valva moderate length, distal one-third somewhat narrow, terminal
margin narrowly rounded, basal two-thirds of costal margin more or less curved
dorsad. Clasper a lobeless plate directed to near base of valva, its tip with a
small protuberance, bearring thin hair. Sacculus rather short, intlated near
base. Juxta a weakly sclerotized plate, its anterior and posterior margins
bifid. Vinculum produced into a small triangular saccus. Aedeagus cylindrical
with two short thorn-like cornuti. Coremata with a bunch of short hair-like
scales.
Holotype. ♂, Ryutousen, Higasisonogi, Nagasaki, Kyushu, Japan, 2. v. 1998
(K. Shibahara leg.) in the collection of the National Science Museum, Tokyo.
Paratype. Japan: Nomozaki Town, Nagasaki, Kyushu, 1 ♂, 26. iv. 1997 (K.
Shibahara leg.) in the collection of H. Yamanaka.
Distribution. Japan (Kyushu).
Remarks. This species is similar to C. pubescens (Warren, 1 892) described
from India in the maculation of both wings, but larger in size (length
of forewing 11 mm in brunnealis, 9-10 mm in pubescens); forewing above
almost overall tinted with dull yellowish brown; a crescent-shaped semihyaline
mark on forewing more or less larger. Male genitalic structures of the
species are closer to those of C. nepalensis Yamanaka described from Nepal
(cf. Yamanaka, 2000, Tinea 16 (Suppl. 1): 64, figs 1389, 1390, pl. 163,
fig. 15), but uncus narrower, apical margin narrowly rounded, and dorsal
setae longer; valva shorter, and basal two-thirds of costal margin more
or less curved dorsad.
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