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COSMOl'TERVGTDJJ, 47 



Erittsh GtJiANA, Barlica and Mallali, fi-ora January to March 

 (Parish) ; seven specimens. 



Stilbosis sympliracta, n. sp. 



J $ . 10-12 mm. Head and thorax rather dark hrnnzy-fnscons, 

 face ochreoiis-whitish. Talpi oclireons-whitish, second joint with 

 scales expanded towards apex, suffused!}' and finely rihbed with 

 dark fuscous, terminal joint anteriorly suffused with dark fuscous. 

 Abdomen rather dark grey. Forewings elongate-lanceolate; 9 out 

 of 6 ; rather dark fuscous ; an oblique suffused ochreous-whitish 

 line beneath costa towards base ; large opposite fuscous subcostal 

 and subdorsal tufts at |- of wing, centred with black, one in 

 disc at f , and a smaller one on dox'sum just before this ; a 

 fine whitish line running from upper end of discal tuft to angle 

 of subterminal line; a fine transverse whitish subterminal lino 

 at ^, acutely angulated in middle, followed beneath angle bj'' 

 a blackish dot and from this to termen by a silver}' spot, these 

 separating it from a light yellow-ochreous blotcli extending 

 along termeu to near apex ; three inwardly oblique fine whitish 

 striguhe from costa towards apex, extending into cilia : cilia grey. 

 Hindwings dark fuscous ; cilia grey. 



BRinsn Guiana, Bartica and Mallali, from Januar}' to March 

 (PHrish) ; seven specimens. 



\f Stilbosis condylota, n. sp. 



2 . 10-12 ram. Head and thorax glossy dark leaden. Palpi 

 dark fuscous, second joint with scales not expanded, Antennie 

 dark grej', apical fourth whitish. Abdomen grey. Forewings 

 elongate-lanceolate; 9 separate; dark fuscous, towards base with 

 a violet-leaden gloss ; large concolorous opposite subcostal and sub- 

 dorsal tufts befoi'e |, one in disc beyond middle, and a smaller 

 dorsal one just beyond this ; a small tuft in disc before subterminal 

 line ; a fine transverse whitish line at |, angulated in middle, 

 lower portion edged posteriorly Avith silvery and followed by a 

 yellow-ochreous blotch extending along termen nearly to apex and 

 including a black central dot ; three indistinct inwardly oblique 

 whitish strigulae from costa towards apex, extending into cilia : 

 cilia grey. Hindwings dark grey ; cilia grey. 



British Guiana, Bartica and Mallali, from December to March 

 (Parish) • four specimens. 



^ Stilbosis gnomonica, n. sp. 



c? . 12 mm. Head dark grey, face ochreous-whitish. Palpi 

 Avhitish, closely irrorated with dark fuscous, second joint finely 

 and irregularly rib])ed, scales somewhat expanded towards apex. 

 Thorax dark fuscous, posterior margin whitish. Abdomen fuscous, 

 beneath whitish-ochi'eous. Forewings elongate-lanceolate, apex 

 somewhat produced, acute ; 9 out of 6 ; dark fuscous ; base slen- 

 derly whitish ; a moderately broad whitish fascia near base, rather 

 inwardly oblique from costa ; large leaden subcostal and subdorsal 



