of the Amazon Valley. 335 
Genus AganistH0s, Boisduval et Leconte, Icon, Lép. Amér. Sept. 
140. Aganisthos Orion, Fabricius. 
Papilio Orion, Fab. Syst. Ent. p. 485. 185 (1775). 
Danaé, Cramer, 84 a, B (1779). 
A widely distributed insect in Tropical and Subtropical America, 
being found from Florida to South Brazil. As might be supposed 
from the great volume of the thorax, it is an insect of extremely 
rapid flight. I have seen it only in open, sunny places in the 
neighbourhood of towns. 
141. Aganisthos Cadmus, Cramer. 
Papilio Cadmus, Cram. 22 a, B (1779). 
Pherecydes, Cram. 380 a, B. 
—— Acheronta, Fabr. Ent. Syst. m1. i. 76. 239 (1793). 
This species was placed by Westwood in the genus Megistanis. 
In all essential points of structure it agrees with Aganisthos, differing 
only in the possession of a tail or slender pointed lobe on the outer 
border of the hind wing. 
Genus Prerona (Boisd.), 
Westwood, in Dbldy. & Hewits. Gen. p. 299. 
142. Prepona Demodice, Godart. 
Nymphalis Demodice, Godt. Enc. Méth. ix. 408. 193. 
Prepona Demodice, Boisd. Species Gén. pl. 7. f. 18. 
Papilio Demophon 2, Linn., Cramer, 158 E. 
Laértes, Hiibn. Sammi. Exot. Schm. 
This species is widely distributed in the Amazons valley, but rare. 
Like all the rest of the genus, it is a strong and swift flier, and has 
the habit of settling on projecting naked branches of trees, main- 
taining its place boldly, and therefore easily captured. 
143. Prepona Eugenes, n. sp. 
¢d. Expanse 3” 8’. Closely allied to P. Demodice. Fore wing not so 
much produced at the apex, and outer border much less strongly incurved : 
blue belt broad, and terminating at the median nervure of the fore wing ; 
but the blue spots existing near the costa in the typical P. Demodice are 
entirely wanting. Abdominal border of the males furnished with a stellate 
fascicle of pale hairs, as in all the species of this section. Beneath, 
P. Eugenes differs from P. Demodice in the ground-colour being through- 
out of an ochreous or pale-brownish tawny hue, ornamented with shining 
ochrey-white spots, in the following order—one at the end of each cell, 
and several placed irregularly in a row from the costa of the fore wing 
across the disks of both wings, nearly to the abdominal border of the hind 
