. A monograph of the jacamars and puff-birds, or families Galbulid and Bucconid . species in the Rio Negro district, where B. macrorhynchus is found,and in Upper Amazonia, where B. dysoni likewise occurs, is certainly a curious fact in distri-bution, as such closely allied representative species usually occupy distinct areas. Herr v. Pelzeln(Sitz. Ak. Wien, xx. p. 498) is inclined to think that B. giganteus may be only the adult male ofB. macrorhynchus, and speaks of having seen intermediate forms. I think if this had been thecase we should have met with examples of B. macrorhynchus in collect
. A monograph of the jacamars and puff-birds, or families Galbulid and Bucconid . species in the Rio Negro district, where B. macrorhynchus is found,and in Upper Amazonia, where B. dysoni likewise occurs, is certainly a curious fact in distri-bution, as such closely allied representative species usually occupy distinct areas. Herr v. Pelzeln(Sitz. Ak. Wien, xx. p. 498) is inclined to think that B. giganteus may be only the adult male ofB. macrorhynchus, and speaks of having seen intermediate forms. I think if this had been thecase we should have met with examples of B. macrorhynchus in collections from Cayenne, where,however, so far as I know, it has never occurred. Nor have I ever seen any specimens of thepresent bird that could not be readily distinguished from B. macrorhynchus. The examples of this species in my collection measure as follows:—• S-o. Sex. Patria. Long, tota, alffi, caudse, rostri. 1. inc. E. Peru [Hauxwell). 10-2 4-5 3-3 2-2 2. ? Para {Layard). 10-0 4-3 3-6 2-1 The figure (Plate XXII.) was prepared from No. 1. $ Sclater, Jac ^c ^iiieica:::-? -.^ BUCCO SV/AllTSOTn. r^sLTJiaJ.^ unp BUCCO SWAINSONL SWAINSONS XXIII. Tamatia macrorhynchos, Swains. Zool. 111. ser. i. ii. pi. 99 (1822). jBucco swainsoni, Gray et Mitch, Gen. B. i. p. 74 (1846). Bucco swainsoni. Gray, List of Fiss. B. M. p. 47 (1848). Capito swainsoni^ Bp. Consp. i. p. 146 (1850). Bucco swainsoni, Sclater, Ann. N. H. ser. 2, xiii. p. 358 (1854). Bucco swainsoni, Scl. Syn. Bucc. p. 8 (1854). Tamatia swainsoni, Bp. Consp. Vol. Zyg. p. 13 (1854). Bucco swainsoni, Sclater, P. Z. S. 1855, p. 196. Capito macrorhynchus, Burm. Syst. Ueb. ii. p. 283 (1856). Bucco swainsoni, Pelz. Sitz. Ak. Wien, xx. p. 509 (1856). Bucco swainsonii, Scl. Cat. A. B. p. 269 (1862). NotJiarchus swainsoni. Cab. et Hein. Mus. Hein. iv. p. 151 (1863). Bucco swainsoni, Pelz. Orn. Bras. p. 21 (1871). Bucco swainsoni, Scl. et Salv. Nomencl. p. 105 (1873). Notharclms swainsoni. Cab. J. f
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