Bulletin - United States National Museum

72 U.S. NATIONAL MUSEUM BULLETIN 257
and 9 closely approximated toward base, 10 closer to 11, 11 from
middle of cell. Upper parting vein from before base of 10 to below
base of 8, close to upper angle of cell, lower parting vein from halfway
between base of wing and base of 1 1 to just below base of 5. Hindwing
with vein 2 from beyond 2/3 of cell, 3 and 4 short-stalked from angle,
5 closely approximated at base, 6 and 7 closely approximated toward
base.
Male genitalia: Tegumen rather high, slender. Uncus peaked,
hairy, membranous. Gnathos (or subscaphium) well developed and
strong, arms sclerotized, forming a pending semicircle, hook porrect,
strong, ending in two diverging and long horns. Valva rather narrow,
with a very deep primary incision, sacculus triangular, cucuUus ovate,
on a narrow stalk, a projection with modified spines at its base.
Anellus strongly extended, forming a concave plate covering the
entire aedeagus from above. The gender of the generic name is
feminine.
Type species: Gnathmocerodes petrifraga, new species.
A small and very natural group of species, characterized by the
unique forked gnathos or subscaphium and the constricted unequal
valvae. The type species and the following two belong here:
Argyroploce lecithocera Meyrick, 1937, Exotic Microlepidoptera, vol.
5, p. 60 (=A. lecythophora Meyrick, 1939, Trans. Roy. Ent. Soc.
London, vol. 89, p. 49), from Java.
Argyroploce tonsoria Meyrick, 1909, Journ. Bombay Nat. Hist. Soc,
vol. 19, p. 592.
Gnathmocerodes petrifraga^ new species
Figures 76, 116, 543
Male, 13-15 mm (type 13 mm). Head and thorax ochreous
grey, mixed with darker grey, thorax irrorated with dark fuscous.
Palpus grey suffused and mixed with darker grey, tip of terminal
segment whitish. Abdomen fuscous.
Fo^e^^^Ilg elongate-subtruncate, dilated, moderately broad, costa
gently curved throughout, apex obtuse, termen gently curved, convex,
little oblique. Pale grey, suffused with fuscous, whitish and fuscous
black. Basal patch large, almost 1/3, grey, centered with paler
scales,
edge angulate, with a deep oblique excision at 1/4; upper half
of space between basal patch and transverse fascia almost white,
finely parted by a black line from a dark dot on costa; transverse
fascia well defined, angulate above middle of wing, not reaching
dorsum, lower extremity gradually rounded with deep oblique excision
in posterior edge just above angulation; this fascia narrow
above, twice as broad below, olive grey, finely edged with blackish,
lower part of excision filled out with white; posterior half of costa