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Show 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. (Ith. zi) Exot. Butt. iv. Ith. t. 25. f. 176 (1868). Ucayali (Bartlett). Mus. S. G. & D. Genus SCADA, Kirby. 1. S. T H E A P H I A (Bates), Trans. Linn. Soc. xxiii. p. 529 (1862). Ucayali (Bartlett). 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 (H. Whitely). Mus. D. A most singular species, exactly like an Ithomia with the neuration 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. 3. f. 14 (1860). Peru. Mus. D. 4. M. MAzasus, Hew. I. 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. |