208 MR. H. DRUCE ON PERUVIAN BUTTERFLIES. [Feb. 1, 



Ucayali {Bartlett). Mus. D. & S. G. 



The specimens vary in the amount of yellow in the posterior wing. 



It may be a local race of C.fluonia, but is a distinct and well-marked 



form. 



Genus Sais, Hiibn. 



1. S. ziTELLA, Hew. {1th. z.) Exot. Butt. iv. Ith. t. 25. f. 176 

 (1868). 



Ucayali {Bartlett). Mus. S. G. & D. 



Genus Scada, Kirby. 

 1. S. theaphia (Bates), Trans. Linn. Soc. xxiii. p. 529 (1862). 

 Ucayali (Bar t let t). Mus. D. 



" Found in low moist places in the forest, upon a small white 

 flower."—^. B. 



Genus Mechanitis, Fabr. 



1. M. ORTYGiA, n. sp. (Plate XVII. fig. 5.) 



Upperside {male) transparent yellowish white, bordered with 

 greyish black, the margins all black ; the anterior wing crossed at 

 the end of the cell by a black band widest on the costal margin. 

 Underside as above, except that the base and half of the costal 

 margin of the posterior wing is yellow, and several white spots at the 

 apex of both wings. 



Exp. 2 inches. 



Huiro, valley of Santana (//. Whitely). Mus. D. 



A most singular species, exactly like an Ithomia with the neura- 

 tion of Mechanitis. 



2. M. POLYMNiA, Linn. {Pap. p.) Mus. Ulr. p. 224 (1764). 

 Nauta and Chyavetes {Bartlett). Mus. D, 



3. M. METHONE, Hew. Exot. Butt. ii. Mech. t. i^i. 14 (1860). 

 Peru. Mus. D. 



4. M. MAz^us, Hew. l. c. t. 2. f. 8 (1860). 



Huallaga {Bartlett). Mus. S. G. 



5. M. ocoNA, n. sp. 



Upperside {male) : anterior wing black, the base to the middle of 

 the cell rufous ; an oblique band crossing the end of the cell to the 

 apex and two others beyond bright yellow, the third close to the 

 apex and only extending to the middle of the wing, four small white 

 spots on the hind margin ; posterior wing orange, yellowish in the 

 middle, crossed from the inner margin to the apex by a zigzag band 

 of black, the outer margin black, widest at the apex. Underside the 

 same as above, with a submarginal row of white spots to both wings 

 and the costal margin of the posterior wing black. 



Exp. 2^ inches. 



Huiro, valley of Santana {H. Whitely). Mus. D. 



Mr. Whitely has only sent one specimen of this species. 



