102 U.S. NATIONAL MUSEUM BULLETIN 25 7 



Microlepidoptera . . . Meyrick, vol. 4, p. 57, pi. 27, figs. 3-3b (wing, 

 genitalia illustr.). 



Peragrarchis syncolleta (Meyrick, 1928), new combination 



Meridarchis syncolleta Meyrick, 1928, Exotic Microlepidoptera, vol. 3, p. 404 

 (cf $ , Andaman Is.). — DiakonofiF, 1950, Bull. Brit. Mus. Nat. Hist., Ent. ser., 

 vol. 1, p. 297. — Clarke, 1963, Catalogue . . . Microlepidoptera . . . 

 Meyrick, vol. 4, p. 58, pi. 28, figs. 4-4b (wing, genitalia illustr.). 



These species have male genitalia of a very characteristic type, 

 showing that the group is natural and compact. They differ from 

 one another by reason of minor points of genital structure and also by 

 coloring and markings. 



Metacosmesis Diakonoff, 1949 



Metacosmesis Diakonoff, 1949, Treubia, vol. 20, p. 48, figs. 5, 6, 10 (type species: 

 Metacosmesis barbaroglypha Diakonoff, 1949, Treubia, vol. 20, p. 48, Java). 



The genus is better characterized by the genitaha of the males than 

 by the superficial characters, e.g., the neuration, which is subject to 

 some variation, which may be either between species or between the 

 sexes of a single species, as has been described in M. barbaroglypha. 



In that species veins 3 and 4 of the forewing are connate in male, 

 closely approximated in female; in M. illodis, new species, they are 

 stalked. Veins 8 and 9 are closely approximated in both sexes of 

 M. barbaroglypha and stalked in M. illodis. Vein 11 originates from 

 4/5 of cell in M. barbaroglypha female, from 3/4 in male, while in other 

 species its origin is situated at 2/3 of cell. 



These variations appear to be less important in the present genus 

 and do not affect its homogeneity, because the male genitalia in the 

 two known species are of a similar characteristic and remarkable 

 shape, with the bases of valvae entirely jointed to the vinculum and 

 the valvae themselves having large clasping hooks. 



Metacosmesis illodis, new species 



Figures 133-134, 579 



Male, 23 mm. Head white, a median longitudinal streak on ver- 

 tex and orbits slightly infuscated. Palpus moderate, subascending, 

 dilated, roughish towards apex above, terminal segment very short, 

 drooping. Antenna light tawny, ciliations over 1, scape white. 

 Thorax white, shoulder niLxed with blackish, a median irregular broad 

 band of light fuscous dusting, apex in middle slightly infuscated. 

 Abdomen silvery white. 



Forewing with veins 3 and 4 stalked, 8 and 9 stalked, 11 from 2/3; 

 narrowly elongate-subtriangular, costa moderately curved toward 

 extremities, hardly curved in middle, apex moderately rounded, ter- 



