South A^nerican^Micro-Lepidoptera. 239 



streak towards base, and indistinct grey subbasal and subapical 

 rings. Thorax violet-brownish-ochreous. Abdomen dark grey, 

 with two long expansible ochreous-whitish anal hair pencils. Middle 

 femora and tibiae dark fuscous, both tufted with rough blackish 

 scales, apex of tibiae blackish, tarsi white ; posterior legs grey- 

 whitish. Forewings very narrowly elongate -lanceolate ; light 

 brownish, with strong violet reflections, strewn throughout with 

 fine fuscous strigulae, costa narrowly whitish-tinged ; apex whitish - 

 tinged, with two or three darker fuscous strigulae : cilia grey, 

 round apex whitish, with some rows of dark grey points. Hind- 

 wings dark grey, thinly scaled in disc anteriorly ; cilia grey. 



British Guiana, Bartica, in February (Parish) ; one 

 specimen. 



Gracilaria oriarcha, n. sp. 



(^. 19 mm. Head grey-whitish. Palpi slightly roughened an- 

 teriorly, whitish, sprinkled with grey. Thorax grey-whitish suffused 

 with light reddish-fuscous. Abdomen pale greyish, anal tuft 

 whitish-ochreous. Middle legs rather dark reddish-fuscous, tibiae 

 tufted towards apex above, tarsi whitish; posterior legs whitish 

 obscurely banded with grey irroration. Forewings very narrow, 

 parallel-sided, moderately pointed; violet-reddish-fuscous, some- 

 what sprinkled with dark fuscous, strewn with irregular dots of 

 whitish scales, edges blackish minutely dotted with white : cilia 

 ochreous-whitish, on costa and round apex with several groups of 

 blackish specks, towards tornus pale greyish. Hindwings grey ; 

 cilia light grey. 



Peru, Jauja, 11,900 feet, in July {Parish); one speci- 

 men. This interesting insect is much the largest of the 

 whole family known to me. 



LYONETIADAE. 

 Opostega microlepta, n. sp. 



(^ $. 4 mm. Head, antennae, thorax, and abdomen ochreous- 

 white. Forewings lanceolate ; shining ochreous-white ; a minute 

 black apical dot : cilia ochreous-whitish, more oclireous-tinged 

 towards base, with a faint grey line at base of costal cilia, and two 

 others beyond it converging to apical dot. Hindwings pale greyish - 

 ochreous; cilia whitish-ochreous. 



British Guiana, Bartica, in February ; Ecuador, Duran, 

 in June {Parish) ; two specimens. Distinguished by its 

 minute size. 



