[126] Campephilus bairdi, Cassin, Pr. A. N. Sc. 1863, 322 (Cuba).—Gundlach, Repertorium, I, 1866, 293.—Ib. Cab. Jour. 1866, 352. Hab. Cuba.
[127] Picoides tridactylus, var. tridactylus. Picus tridactylus, Linn. S. N. 12th ed. I, 177 (1766).—Degland, Orn. Eur. I, 161 (1849). Apternus tridactylus, Bonap. Birds (1838), p. 9.—Gould, Birds of Europe pl. ccxxxii. Picoides tridactylus, Gray. Picoides europæus, Less. Orn. p. 217 (1831).
[128] Picoides tridactylus, var. crissoleucus. Picus crissoleucus, Brandt, Mus. Petrop. Apternus crissoleucus, Bonap. Consp.—Reich. Syn. p. 362, No. 836; pl. dcxxxi, f. 4197, 4198. Picoides crissoleucus, Malh. Monog. Pic. I, 180. “Apternus kamtchatkensis, Bonap.”—Malh. Monog. Pic. I, 180 (in synonomy). Apternus tridactylus, Mus. de Mayence.—Pallas, Zoogr. Ros. As. I, 415.
[129] Centurus carolinus, var. tricolor. Picus tricolor, Wagl. Isis, 1829, 512. Centurus tri. Scl. Catal. Am. B. 1862, 343. C. subelegans, Scl. P. Z. S. 1855, 162; 1856, 143.
[130] Centurus aurifrons, var. hoffmanni. Centurus hoffmanni, Cabanis, Journ. Sept. 1862, 322 (Costa Rica).
[131] Melanerpes formicivorus, var. striatipectus, Ridgway. In view of the very appreciable difference from the other races named, it appears necessary to name this one, in order that it may rank equally with the rest. The almost entirely streaked breast is only an approach to what we see, in its extreme phase, in the var. flavigula. The black vertex of the female appears broader than in specimens of var. formicivorus.
[132] Melanerpes formicivorus, var. flavigula, Natt. Melampicus flavigula (Natt.), Malh. Rev. Zoöl. 1849, 542, Monog. Pic. II, 202, pl. xcix, f. 5, 6. Melanerpes flavigularis, Scl. P. Z. S. 1856, 161. This can only be considered the melanistic extreme of a species of which the var. formicivorus is the rubescent one, the transition being gradual through the var. striatipectus of the intermediate region.
[133] Colaptes mexicanoides, Lafr. Rev. Zoöl. 1844, 42.—Scl. & Salv. Ibis, 1859, 137.—Scl. Catal. Am. B. 1862, 344. Colaptes rubricatus, Gray, Gen. B. pl. cxi. Geopicus rub. Malh. Monog. Pic. II, 265, pl. cx, figs. 1, 2. Picus submexicanus, Sund. Consp. Pic. 1866, 72.
[134] A series of hybrids between mexicanus and auratus is in the Smithsonian collection, these specimens exhibiting every possible combination of the characters of the two.
[135] Colaptes auratus, var. chrysocaulosus. Colaptes chrysocaulosus, Gundlach, Boston Journal.—Ib. Repert. I, 1866, 294.