MR. A. G. BUTLER ON THE SPllINGIDiE. . 601 



Genus 4. Isognathus, Felder. 

 Isognathus, Felder, Wieu. ent. Mem. vi. p. 187 (1862). 



Section Erinnyis, Hiibner (restricted) 1 . 



1. Isognathus rimosus. 



<J, Erinnyis rimosa, Grote, Proc. Ent. Soc. Phil. v. pp. 73 and 167, pi. 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 Sphingidse/ p. 75 (1865). 



Haiti (Tweedie). B.M. 



2. Isognathus laura, n. 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 (Dyso7i). 'JjP e > B.M. 



3. Isognathus amazonicus, n. sp. (Plate XCIV. fig. 8.) 



$>, Anceryx scyron, Walker (nee 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. Lye. 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. 



1 Mr. Grote remarks, Lye. Nat. Hist. New York, that E. rimosa and E. congratulans are a group "charac- 

 terized hy the elevated square thoracic parts, which are hut slightly advanced before the insertion of the pri- 

 maries." They remind one of the geuus Diludia in pattern. 



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