MR. A. G. BUTLER ON THE SPHINGID®. i 601 
Genus 4. Isoanatuus, Felder. 
Tsognathus, Felder, Wien. ent. Mon. vi. p. 187 (1862). 
‘Section Errmnyts, Hiibner (restricted)'. 
1. ISOGNATHUS RIMOSUS. 
3, Erinnyis rimosa, Grote, Proc. Ent. Soc. Phil. v. pp. 73 and 167, pl. 2. fig. 1 (1865). 
Anceryx scyron (part.), Walker, Lep. Het. viii. p. 225. no. 5 (1856). 
Sphinx mnechus, Poey, in Grote’s ‘ Notes on Cuban Sphingide,’ p. 75 (1865). 
Haiti (Tweedie). B.M. 
2. ISOGNATHUS LAURA, 0. sp. 
Nearly allied to the preceding, but rather smaller; the primaries more distinctly 
marked, the black discal dash shorter; the secondaries of a rather paler yellow colour, 
with the marginal border one third narrower; body darker; wings below darker, trans- 
verse bar more distinct. Expanse of wings 2 inches 4 lines. 
Venezuela (Dyson). Type, BM. 
3. IsoGNATHUS AMAZONICUS, n. sp. (Plate XCIV. fig. 8.) 
9, Anceryx scyron, Walker (nec Cramer), Lep. Het. viii. p. 225. no. 5 (1856). 
Villa Nova (Bates). Type, B.M. 
This is the species described by Walker; it is the largest in the genus. The primaries 
have a peculiar greyish tint, and the markings are strongly defined; the outer border 
of secondaries takes up a little more than one third of the wing; the bands on the 
abdomen are well defined, and scarcely interrupted in the centre. 
4. ISOGNATHUS CONGRATULANS. 
Erinnyis congratulans, Grote, Ann. Lyc. Nat. Hist. New York, viii. p. 200 (1867). 
Cuba (Gundlach and Poey). 
5. IsoGNATHUS FUMOSA. 
Isognathus fumosa, Butler, P. Z.S. 1875, p. 258. no. 50. 
Brazil (Stevens). Type, B.M. 
‘ Mr. Grote remarks, Lyc. Nat. Hist. New York, that ZH. rimosa and L. congratulans are a group ‘‘ charac- 
terized by the elevated square thoracic parts, which are but slightly advanced before the insertion of the pri- 
maries.” ‘They remind one of the genus Diludia in pattern. 
4u2 
