NOCnOA. OSLAKIA. 257 



*4643. Nocloa arivaca. (Plate CXLII. fig. 27.) 



Lythrodes arivaca, Barnes, Can. Ent. xxxix. p. ()6 (1907). 



2 . Head and tliorax creamy white ; abdomen yellowish white 

 tinged with brown. Fore wing creamy white with a yellowish 

 tinge, the outer half of medial area tinged with red-brown, the 

 ■veins streaked with brown ; antemedial line ochreous, downcurved 

 to vein 1 near base; orbicular and reniform small, defined by 

 blackish, the former round, the latter with black centre; medial 

 line dark, expanding into a patch on costa, tlien incurved; post- 

 medial line brown, slightly bent outwards below costa, excurved to 

 vein 5, then strongly incurved; traces of a subterminal line 

 excurved below vein 7 ; cilia white intersected with ochreous. 

 Hind wing yellowish white tinged with brown towards termen ; 

 cilia white. 



Hah. U.S.A., S. IVew Mexico. Exp. 36 millim. This species is 

 unknown to me ; figured from a drawing from type in Coll. W. 

 Barnes. 



Genus OSLARIA. 



Type. 

 Oslaria, Dyar, J, N.Y. Ent. Soc. xii. p. 41 (1904) viridifera. 



Proboscis aborted, rather small; palpi upturned, the 2nd joint reaching to 

 about middle of froiis and moderately fringed with hair in front, the 3rd short; 

 froiis with large heart-shaped corneous prominence with raised edges, its lower 

 edge produced to a point and witli corneous plate below it ; eyes large, round ; 

 antenna of male laminate and almost simple : tliorax clothed with rough 

 scales and hair mixed, the prothorax without crest, the metatlioras with 

 spreading crest, the patagia rather curled upwards at extremities ; tibife 

 moderately fringed with hair, the fore tarsi typically short and the ungues 

 very large ; abdomen with dorsal crest at base only. Fore wing with the apex 

 rounded, the termen evenly curved and hardly crenulate ; veins 3 and 5 from 

 near angle of cell ; (i from upper angle ; 9 from 10 anastomosing with 8 to 

 form theareole; 11 from cell. Hind wing with veins 3, 4 from angle of cell ; 

 6 obsolescent from just below middle of discocellulars ; 6, 7 from upper angle ; 

 8 anastomosing with the cell near base only. 



Sect. I. Fore tarsi with the joints very short and the ungues large. 



A. Fore wing with slight olive-green streats on terminal area 



above and below vein 4 viridescens. 



B. Fore wing without olive-green streaks on terminal area 



above and below vein 4 viridifera. 



4644. Oslaria viridescens. (Plate CXLII. fig. 28.) 



Siibadium viridescens, Schaus, Trans. Am. Ent. Soc. xsx. p. 153 (1904). 



Head, thorax, and abdomen ochreous mixed with olive-green. 

 Fore wing ochreous suffused with olive-green, the basal and medial 

 areas faintly tinged with purple and the medial area suffused "witk 

 red-brown from median nervure and vein 2 to above vein 1 ; sub- 

 basal line absent; antemedial line red-brown expanding into a 

 triangular rufous shade at costa and defined by whitit^h on inner 

 side, oblique, sinuous ; orbicular and reniform large with faint pale 

 annuli slightly defined by brown, the former rather oblique elliptical, 



VOL. IX. .s 



