half of the Argentine Ornis, we may say that Finches, Tyrants, and Wood-hewers are remarkable for their abundance, Plant-cutters and Tapacolas for peculiarity of type, and Dippers as an instance of the occurrence of an Arctic form in Antarctic latitudes. +------------------------+-------------+-------------+-------------+ | | I. | II. | III. | | | No. of | No. of | | | | Neotropical | Argentine | Proportion. | | | Species. | Species. | | +------------------------+-------------+-------------+-------------+ | I. Passeres. | | | | | Oscines | 1049 | 108 | - | | Oligomyodæ | 445 | 67 | + | | Tracheophonæ | 482 | 54 | - | | II. Macrochires | 444 | 18 | -- | | III. Pici | 116 | 13 | - | | IV. Coccyges | 214 | 15 | - | | V. Psittaci | 142 | 10 | - | | VI. Striges | 37 | 6 | + | | VII. Accipitres | 114 | 22 | + | | VIII. Steganopodes | 17 | 1 | - | | IX. Herodiones | 44 | 19 | + | | X. Anseres | 64 | 23 | ++ | | XI. Columbæ | 66 | 8 | = | | XII. Gallinæ | 90 | 4 | - | | XIII. Opisthocomi | 1 | 0 | | | XIV. Geranomorphæ | 57 | 16 | ++ | | XV. Limicolæ | 73 | 25 | ++ | | XVI. Gaviæ | 53 | 9 | + | | XVII. Pygopodes | 9 | 5 | + | | XVIII. Impennes | 9 | 1 | = | | XIX. Crypturi | 36 | 8 | + | | XX. Struthiones | 3 | 2 | + | | +-------------+-------------+ | | | 3565 | 434 | | +------------------------+-------------+-------------+-------------+