in the Basin of the Amazons. 241 



marginal shade sinuous, distinct only near the costa ; a marginal 

 row of minute dark dots. Hind wings rather browner, with the 

 markings of the fore wings repeated ; fringes of both wings uni- 

 colorous. Head, thorax, and abdomen cinereous ; palpi paler, 

 fuscous, finely mottled with oclu-eous. Under side dull brownish 

 grey, with the two outer lines alone showing darker, and a dark 

 central spot in the hind wing. Expanse of wings, 30 mm. 



Two specimens only, both females ; one from Trom- 

 petas, Feb. 28th, 1875 ; the other from Guara, R. 

 SoHmoes, Nov. 22nd, 1874. 



21. Bertula biciliata, n. s. 



Fore wings dull fuscous, with traces of two sinuous dark lines, 

 one before, the other beyond the middle, and a darker central shade 

 between them ; also of a blackish orbicular and reniform stigma, 

 and of a submarginal line, beyond which the exterior margin of 

 the wing seems to have been paler. Hind wings like the fore 

 wings. The example is too much worn to admit of any exact 

 description, as far as its markings are concerned ; but the last 

 joint of the palpi unfolds like that of B. Talausalis, from Vene- 

 zuela, into a large fan-like tuft of hairs. The species, however, 

 may best be distinguished by the peculiar antennae : these, instead 

 of being, as in B. Talausalis, armed with long thin pectinations, 

 are thickly bipectinated, each pectination resembling a short claw, 

 and bearing at its apex a fine hair of the same length as the claw 

 itself; the stem of the antennae is finely serrated above between the 

 base of the pectinations. Expanse of wings, 42 mm. 



One (? . Gaviao, Nov. 10th, 1874 ; at light. 



The constitution of the terminal joint of the palpi in 

 the 3- of this genus is very singular. It consists of a 

 piece of thin membranous tissue, bearing fine scales on 

 its outer surface, but with its inner surface clothed with 

 long silky ochreous hairs, which can be expanded so as 

 to form a large fan-like tuft. 



Erebothrix, n. g. 



Fore wing short and broad ; costa gradually curved, slightly 

 hollowed beyond the middle ; hind margin nearly straight ; inner 

 margin curved at the base. Hind wing rounded, with the anal 

 angle somewhat produced, and a broad flap along the inner mar- 

 gin clothed with bristly hairs. Palpi moderately hairy, curved 

 upwards, and reaching only a little above the liead ; third joint 



