460 Lord Rothschild on Arctiinze from 
abdominal half of the wing is deep uniform rose acutely cut 
off from the pale costal half. 
Length of fore wing 18 mm.; expanse 41 mm. 
1 g caught. 
[Idalus mossi fluviatilis, subsp. n. 
o. Differs from mossi mossi in being much paler in 
colour, in the large tooth running into the yellow terminal 
area of fore wing being reduced to a point, and in the hind 
wing being entirely sericeous buffy cream-grey with only a 
slight rose tint on the hairs of abdominal half. 
@. Differs from ¢ in being much darker and having the 
hind wings large and normally developed and uniform rose- 
colour throughout. 
266,22 2%, Fonte Boa, Upper Amazons, Aug. 1907 
(S. M. Klages coll.); 1 9, Manaos-Yutshi (Maewell 
Stuart). | 
12. Idalus favillacea (Rothsch.). 
Automolis favillacea, Rothschild, Novit. Zool. vol. xvi. p. 86. no. 55, 
pl. v. fig. 28 (1909) (Aroewarwar Creek). 
Mr. Moss obtained 1 @ of this species, of which hitherto 
only the unique ¢ type had been recorded. 
6. Differs from 9 in being smaller, in the dark area of 
hind wings being smoky-black sharply cut off from the 
cream-coloured costal area, and in the hind wings being 
small and triangular. 
Length of fore wing, ¢ 17 mm., 2? 20 mm. ; expanse, 
3 41 mm., 2 47 mm. 
1 o caught. | 
13. Aphyle margaritacea, Walk. 
Aphyle margaritacea, Walker, List Lepid. Ins. Brit. Mus. pt. iii. 
~ p. 720, no. 1 (1885) (Para). 
1932 2 2 caught. 
14, Pheomolis incarnata (Hmpsn.). 
Aphyle incarnata, Hampson, Cat. Lepid. Phal. Brit. Mus. vol. iii. 
p. 20, no. 1215, fig, 11 (1901) (St. Paulo di Olivencas). 
1g, 1 2 caught; 1 2 bred (cocoon hammock-shaped, 
with long narrow pointed ends yellowish wood-brown). 
There appears to be considerable confusion with this 
insect and its near allies; Sir George Hampson, when 
describing it, only knew the ¢; the ¢ was described 
five years later by Mr. Herbert Druce as Jdalus marpessa 
