of the Amazon Valley. 307 
from P. Amphimachus constantly in the much darker hue of the outer 
halves of the wings beneath, and in the presence of a paler outer 
border to the fore wing, separated from the dark-brown hue by a 
line nearly parallel to the margin. In the species which I take to 
be P. Amphimachus the outer halves of the wings, beneath, are of a 
much lighter brown hue, and there is no paler border to the fore 
wing, but, instead of this, a dusky line strongly angular towards the 
apex. 
Upper and Lower Amazons; not very common. 
146. Prepona Amphimachus, Fabricius. 
Papilio Amphimachus, Fabr. Syst. Ent. p. 457, n. 59. 
This is a very common species throughout the Amazons region. 
The larva, which resembles much in form that of Apatura Iris, is of 
a uniform olive-green colour. The pupa is broad, smooth, and very 
protuberant in the middle of the dorsal part of the abdomen. 
147. Prepona Demophon, Linneus. 
Papilio Demophon, Linn. Syst. Nat. ii. 753. 47. 
, Clerck, Icones, t. 29. f. 3, 4. 
Sisyphus, Cramer, 158 c. 
— Thalpius, Hiibn. Samml. Exot. Schm. 
A common insect throughout the Amazons region. 
148. Prepona Amphitoé, Godart. 
Nymphalis Amphitoé, Godt. Enc. Méth, ix. 407. 190. 
Closely allied to P. Demophon, but different in the pale-ashy hue of the 
underside and the form of the transverse black line, which consists of 
short lines, each of which is angulated in the interspaces between the 
nervures. 
Generally distributed in the Amazons region, but much less com- 
mon than P. Demophon. 
149. Prepona Lycomedes, Cramer. 
Papilio Lycomedes, Cramer, 158 v. 
Rare; Ega, Upper Amazons. 
Genus Aerras, Dbldy. Proc. Zool. Soc. 1848, p. 46. 
150. Agrias Sardanapalus, Bates. 
Agrias Sardanapalus, Bates, Proc. Entom. Soc. Lond. April 1860. 
——, Hewitson, Exot. Butt. Agr. f. 4. 
This magnificent insect is one of the most richly coloured of the 
