18 HETEROCERA. 
3. Amphonyx rivularis. 
Amphonyz rivularis, Butl. P. Z. 8S. 1875, p. 11°; Trans. Z. 8. ix. p. 599, t. 94. £. 6. 
Hab. Nicaragua, Chontales (Belt, mus. Oaf.); Panama, Chiriqui (Arcé, mus. D.).— 
Amazons, Ega 1. 
This species is easily distinguished from all other members of the genus by the green 
shade of the primaries. 
4, Amphonyx cluentius. 
Sphing cluentius, Cr. Pap. Ex. i. t. 78. f. Bt. 
Hab. Panama, Chiriqui (mus. Staudinger).—Gutana, Surinam! ; BraziL, Rio (mus. D.). 
I include this species on Dr. Staudinger’s authority. 
ANCERYX. 
Anceryz, Walk. Cat. viii. p. 222 (1856). 
This genus, as restricted by Mr. Butler, contains two closely-allied species, both 
belonging to the Neotropical Region. One only of these occurs within our limits. 
1. Anceryx alope. 
Sphinz alope, Drury, Ill. Nat. Hist. i. t. 27. f. 1°. 
Hab. Panama, Chiriqui (Ribdé).—AntitLes, Jamaica!; Ecoapor (mus. D.); S.E. 
Brazi (mus. D.). 
I have only seen a single example of this species from Central America, taken near 
Chiriqui. It agrees in all respects with a large series of specimens from Ecuador. 
ISOGNATHUS. 
Isognathus, Felder, Wien. ent. Mon. vi. p. 187 (1862). 
Mr. Butler places nine species in this genus, all being found in South America, one 
only as yet having been recorded from Panama. 
1. Isognathus scyron. 
Sphine scyron, Cr. Pap. Ex. iv. t. 801. f. B’. 
Hab. Panama, Chiriqui (mus. Staudinger).—Gutana, Surinam 1. 
I have not seen a Central-American specimen of this species, but include it on the 
authority of Dr. Staudinger. 
DILOPHONOTA. 
Dilophonota, Burmeister, Abhandl. naturf. Gesellsch. Halle, p. 69 (1855). 
Very close to the two preceding genera. It contains about eleven species, six of 
which occur within our region. 
