TRIFID,-E. 237 



more ovate fore wings, abdomen shorter, stouter and 

 pointed. 



We have but one species. 



1. R. tenebrosa, Huh. — Expanse of male \\ to 1^ inch, 

 of female 1 to 1^ inch. Antenn^B of the male very strongly 

 pectinated; fore wings shining dark umbreous with very 

 slender black transverse lines ; costa spotted with white ; 

 hind wings pale smoke-colour. Female far smaller, with 

 narrow fore wings and threadlike antenna). 



Antenna3 of the male pectinated with long, slender but 

 somewhat clubbed, ciliated teeth, dull brown ; palpi rather 

 short, moderately tufted, apical joint prominent and rather 

 tufted, umbreous ; eyes naked, shining leaden black, with 

 black back lashes ; head and thorax dull pale umbreous, the 

 latter faintly tufted at the back ; fascicles dirty white ; ab- 

 domen shining pale brown, the basal portion covered with 

 long scales ; lateral and anal tufts spreading, dull brown. 

 Fore wrings very broad and blunt, costa rather curved ; apex 

 bluntly rounded ; hind margin perpendicular, very full and 

 somewhat truncate, but suddenly rounded off below the 

 middle ; dorsal margin nearly straight ; colour umbreous 

 with a silky gloss ; markings very obscure ; basal line partial, 

 a short curved dark brown streak, edged with ashy-brown ; 

 first line oblique, black-brown, very slender but angulated 

 and indented throughout ; second line also very slender, 

 black-brown, nearly perpendicular and composed throughout 

 of crescents with long points on the nervures ; subterminal 

 line a mere thread of whitish brown edging a darker shade 

 of ground colour ; orbicular stigma usually quite absent but 

 occasionally suggested by a most obscure black-brown 

 margin ; reniform stigma indistinct but usually traceable by 

 brownish-white cloudy marginal streaks edged with dull 

 black ; between them and crossing to the dorsal margin is a 

 smoky-black central shade ; on the costa are five or six white 

 or whitish-brown spots or dots ; cilia umbreous. Hind wings 



