206 PROCEEDINGS OF THE JSiATIOXAL MUSEUM. vol. xxix, - 



streak below costa for two-thirds from base. Secondaries dark gre}'; 

 the costal margin Avhitish; fringe at apex blackish. 



Expan.se. — 1.5 mm. I 



Habitat. — St. flean, French Guiana. 



Type.—V,'Ai. No. 8557, U.S.N.M. 



J 



Family ARCTIID^F. 1 



Genus ROBINSONIA Grote. 

 ROBINSONIA ROCKSTONIA, new species. 



Palpi, head, and collar dark brown spotted with white; some ochre- 

 ous below and at sides of head. Legs white inwardly, brown out- 

 wardly. Thorax ochi'eous; patagia white, edged with dark gre3'ish 

 brown. Abdomen with a dorsal ochreous stripe, with a dark })rown 

 stripe on either side of it, laterally and ventrally white. Primaries 

 brown; a broad subcostal ochr(H)us streak; below cell and beyond it, 

 below v^ein 0, white, leaving the mai'gins narrowly' brown, also veins 

 2, 3, and 4; subapical white spots above and l)elow vein 7; smaller 

 marginal white spots above and below vein 5. Secondaries white, a 

 fuscous streak on veins 2 and 1; a dark streak on basal half of costal 

 margin. Underneath similar, without any ochreous. 



Kvpanse. — 40 mm. 



//rt^/^(/?'. -Rockstone, British Guiana. 



Allied to R. lefaivrei Schaus. 



Type.—Q,2X. No. 8563, U.S.N.M. 



ROBINSONIA EVANIDA, new species. 



Head and thorax white; back of head ochreous. Abdomen ochre- 

 ous above; su))dorsal white points; wdiite ventrally. Primaries white; 

 the costal margin pale greyish brown. In the male the outer and 

 inner margin and a stripe across end of cell to outer margin between 

 veins 2 and 3, faintl}" greyish. Secondaries white. 



This is probably a subspecies of R. formula Grote. Had I not taken 

 the specimens myself, I should have thought they had lost their mark- 

 ings in the cyanide bottle. The male was taken in May, the female in 

 July, at Santiago de Cuba. 



Expanne. — 34 nun. 



Rohinmnla formula was not found at the east end of tlie island, but 

 was common at Matanzas. Rohinsonia dewitzi Gundlach was also taken 

 at Matanzas; it is an older name for R. grotel S<Avcins, and I have speci- 

 mens from Mexico, Trinidad, Cuba, French Guiana, and Rio de Janeiro, 

 Brazil. 



Type.— Cat. No. 8564, U.S.N.M. 



