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Show 194 DR. R. W. SHUFELDT ON THE COMPARATIVE [Mar. 3, spots are subapical, two spots being close together below the fifth subcostal nervule, the second between the first radial, while the third is a little further off near the hind margin, below the second radial nervule. Hind wing black, enclosing a large yellow area which reaches from near the base of the wing, spreads over the cell, and occupies the basal third of the disk. Underside. Fore wing dusky, the apex somewhat reddish ; the base buff chestnut, extending along the basal edge of the costal margin. The white spots of the upper surface indicated by pearly-white spots below. Hind wing. Bright chestnut at the base, with tiny dots of black, followed by a yellow mesial area, almost coextensive with the same area on the upper surface, but reaching to the inner margin of the wing behind the chestnut, which has sharply quadrate borders on its hinder aspect ; the whole of the hind margin bronzy brown with a reddish tinge, forming a very broad band, the nervules marked by black lines, with a mesial line of black between each nervule to the hind margin. Exp. 2$ inches. Hab. Mount Elgon, Feb. 1890. DESCRIPTION OF THE PLATES. PLATS XVI. Fig. 1. Papilio mackinnoni, sp. n., p. 187. 2. Mylothris wintoniana, sp. n., p. 189. 3. Mylothris jacksoni, sp. n., p. 190. 4. Belenois margaritacea, sp. n., p. 191. 5. Mylothris mackenziana, sp. n., p. 190. 6. Teracolus elgonensis, sp. n., p. 191. PLATE XVII. Fig. 1. Papilio jacksoni, sp. n., <$, p. 188. 2. Papilio jacksoni, sp. n., $>, p. 188. 3. Acrcea excelsior, sp. n., p. 192. 4. Acrcea melanoxantha, sp. n., p. 193. 5. Acrcea oreas, sp. n., p. 193. 3. On the Comparative Osteology of the United States Cohtmbidce. By R. W . SHUFELDT, C.M.Z.S. [Eeceived February 2, 1891.] Opportunity has recently been afforded me to compare together examples of the skeletons of the following species of Pigeons of our avifauna, viz.:-Ectopistes migratorius, Zenaidura macroura, Engy-ptila albifrons, Melopelia leucoptera, Columbigallina passerina, inca, and Starnoenas cyanocephala. I have also had at hand during this work skeletons of several of our domesticated varieties, a large series of skeletons of nearly all our gallinaceous birds, and the published accounts of the osteology of many forms of columbine |