South American Micro- Lepidoptera. 17 



Crocidosema cosmoptila, n. sj). 



(^. 17 mm. Head and thorax grey mixed with blackish. (Palpi 

 broken.) Abdomen mostly black (partly defaced), towards apex pale 

 ochreous. Forewings elongate, posteriorly somewhat dilated, costa 

 gently arched, with narrow fold from base to near middle and rough 

 scales beneath it basally, apex obtuse, termen slightly sinuate in 

 middle, somewhat oblique; grey, mixed with whitish and suffused 

 with dull greenish, on costal g dark violet-grey; costa blackish, on 

 posterior half with five pairs of whitish strigulae; basal patch 

 suffused with blackish, undefined, cut by an irregular suffused white 

 median streak from base, running into a large trapezoidal median 

 dorsal whitish blotch whose upper portion projects posteriorly so as 

 almost to reach ocellus ; ocellus margined laterally by silvery-metallic 

 streaks and limited above by a curved irregular outwardly oblique 

 black streak, internally sjjeckled with white and containing two 

 black dots : cilia grey sprinkled with blackish (imperfect). Hind- 

 wings dark grey, paler and thinly scaled in cell, veins dark fuscous ; 

 tuft long, grej^ posteriorly whitish, projecting downwards over an 

 ochreous-yellow space surrounded with a few scattered black scales ; 

 cilia grey. 



Argentina, R. Parana, in April ; one specimen. 



Crocidosema impendens, n. sp. 



cJ $. 16-17 mm. Head whity-brownish, crown in 3* sometimes 

 suftused with dark grey. Palpi whitish. Thorax ochreous-whitish, 

 somewhat strigulated with dark fuscous, or in ^ anteriorly and 

 dorsally suffused with dark grey. Abdomen whitish-grey. Fore- 

 wings elongate, posteriorly somewhat dilated, costa gently arched, 

 in (^ without fold, apex obtuse, termen slightly rounded, faintly 

 sinuate in middle, somewhat oblique; pale brownish-ochreous ; in 

 (J a basal patch of dark fuscous suffusion extended on costal half 

 almost to apex, on dorsal half reaching to | and followed by an 

 ochreous-whitish quadrate dorsal blotch; in $ whole wing longi- 

 tudinally streaked with dark fuscous suffusion on veins, most 

 strongly subdorsally, costal and dorsal edges strigulated with 

 dark fuscous; ocellus lateralty margined with indistinct silvery- 

 metallic streaks, containing three or four undefined black dots near 

 posterior edge : cilia whitish-ochreous somewhat mixed with dark 

 fuscous above middle and on base of lower part of termen, on 

 costa and a subtornal spot dark fuscous. Hindwmgs whitish-grey 



TRANS. ENT. SOC. LOND. 1917. — PART I. (NOV.) C 



