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 ex- 

 cision 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 



