10 PROCEEDINGS OF THE NATIONAL MUSEUM VOL, 125 
wing whitish, strongly mottled with grayish fuscous; cilia gray basally, 
white apically. Foreleg ocherous white, overlaid with fuscous; hindleg 
ocherous white, suffused and irrorate with grayish fuscous, particu- 
larly on outer side. Abdomen ocherous white with grayish-fuscous 
suffusion and irroration. 
Male genitalia slide JFGC no. 11623. Harpe moderately broad, 
cucullus rounded; sacculus very broad basally and heavily sclerotized, 
terminating in a sharp point. Uncus rather short, compressed, sharply 
pointed. Vinculum evenly rounded, narrow. Tegumen short, stout. 
Transtilla terminating in a median, stout, strongly spined process. 
Anellus subrectangular, broader than long. Aedeagus stout, distally 
terminating in a sharp, slightly curved, point; vesica armed with two 
long and two short cornuti. 
Holotype: U.S. National Museum No. 69731. 
Type-locality: Guatemala, Chejel. 
Distribution: Guatemala. 
Described from the male holotype (June, Schaus and Barnes) and 
3 o'c' paratypes, all with the same data. Male genitalia figured from 
the holotype. 
Apparently melasma is closely related to H. perspicuana Barnes 
and Busck but is immediately distinguished from it by the four 
cornuti, there being only three in perspicuana. The uncus of melasma 
is less than half the length of that of perspicuana and the sacculus 
is much wider. 
As 
Ficure 5.—Hysterosia melasma, new species: a, ventral view of male genitalia with left 
harpe and aedeagus removed; 5, aedeagus. 
