NEW MICROLEPIDOPTERA FROM BRITISH GUIANA 91 



annulation before the tip ; terminal joint with base broadly dark brown, 

 tip yellowish. Face yellowish white. Head light ochreous. Thorax 

 ochreous with a narrow blackish brown transverse line across the middle. 

 Patagia with a black line across their bases. Forewings light ochreous 

 brown ; costa yellowish with a small black dot at basal third and a larger 

 on the middle ; a subcostal, black, interrupted longitudinal streak edged 

 dorsally by a yellow longitudinal line ; ill-defined groups of black dots at 

 apical third of costa and at the end of the cell ; a series of black dots 

 around apical and terminal margin, edged with yellow ; cilia with alter- 

 nating yellow and black tufts. Hindwings dark brown. Abdomen 

 brown above. Underside of body silvery white. Legs white with 

 broad bars of blackish brown on tibiae and tarsi. Alar expanse : I 7 mm. 



Habitat: Kitty, British Guiana. 



Food plant : Securidica. 



U. S. Nat. Mus. type No. 1 601 5. 



Eucosma tetropsis, new species. 



Second joint of labial palpi light ochreous with two transverse dark 

 brown bars, a heavy one near base and a narrow one near the tip, apex 

 of second joint and terminal joint dark brown. Head eind thorax dark 

 brown. Forewings in the male with well developed costal fold reaching 

 to the middle of the wing and with a series of tufts of raised scales on 

 the fold ; greenish ochreous mottled with dark brown ; a series of equi- 

 distant dark brown streaklets on costa from base to apex with their inter- 

 vals silvery violet ; the tufts on the fold silvery violet ; a thin, silvery, 

 metallic, zigzag line runs from apex along the terminal edge to tomus, 

 thence obliquely upwcird to the end of the cell and again downward to 

 the tufts on the fold. Cilia light greenish brown with heavy tufts of black 

 in the upper half. Hindwings dark greenish fuscous with costal edge 

 silvery. Abdomen dark brown with anal tuft and underside lighter. 

 Legs blackish brown with inner side and joints ochreous. Alar ex- 

 panse : 1 3 mm. 



Habitat : Kitty, British Guiana. 



Foodplant : Guava, feeding on the tender shoots. 



U.S. Nat. Mus. type No. 16016. 



This species I should formerly have placed in the genus Crocidosema, but 

 late studies have convinced me that the supposed characters of this genus, 

 notably the position of veins 6 and 7 in the hindwing, do not hold good 

 and that the genus cannot be maintained apart from Eucosma Hiibner. 



