756 BULLETIN UNITED STATES GEOLOGICAL SURVEY. [Yol.Y. 



1825. Lesson, [R. ] P. Quelques Observations sur Ics Falco clirysaetos et fulvnis, qui 

 prouvent I'identit^ de ces deux esp^ces; par P. -J. Selby. . . . <^F^U8S. 

 Bull., 2« sect., vi, 1825, pp. 96, 97. 

 Bxtrait des Mem. Wern. 8oe., iv, pt. ii, 1823, pp. 428-433, q. v. 



1825. Lesson, [R. ] P. Remarques sur diverses opinious Praises sur la distinction sp6ci- 

 fique, ou sur I'identite des Aigles commun et dore ; par James Wilson. . . . 



< Feruss. Bull, 2« sect., vi, 1825, p. 97. 



Extrait des Mem. Wern. Soe., iv, pt. ii, 1823, pp. 434-448, q. v. 



1825. Lesson, R. P. Esquisses ornitliologiques, ou observations sur les rapports qui 

 existent dans un des groupes les plus nombreux en esp^ces d'oiseaux ; par N.- 

 A. Vigors, jun. . . . <i^e>ttss. 5«/?.,2e sect., vi, 1825, pp. 406-408. 



'Extrait An ZoologicalJournal, i, Oct., 1824, pp. 308-446; cette partie des "Esquisses" ren- 

 fermantla classification "quinaire" des Falconid6s. 



1825. Vigors, N. A. On a new genus of Falconidae [Gampsonyx swainsonii, sp.n.,p. 

 69]. <^Zool. Journ., ii,No. 5, Apr., 1825, pp. 65-70. 



A subhead, beiug part of the 2d instalment of "Sketches in Ornithology; or," etc. Cf. 

 Feruss. Bull, 2" sect., vii, 1826, p. 106; Isis, 1830, pp. 839, 840. 



1825. Vigors, N. A. On a new genus of Falconidje [Nauclerus riocourii, p. 386, sp. n. ]. 



<^Zool.Jonrn., ii, No. 7, Oct., 182.5, pp. 385-387. 



A subhead, being part of the fourth instalment (pp. 368-405) of the series of papers entitled 

 " Sketches on Ornithology ; or," etc. Cf. Feruss. Bull., ix, 1826, p. 91 ; Isis, 1830, pp. 1042, 1043. 



1826. Lesson, R. P. Esquisses ornithologiques, etc., sur un genre nouveau des Fal- 



conidse; par M. N. A. Vigors. . . . <^ i¥mss. i>«Z/. , 2"= sect. , vii, 1828, p. 106. 

 Gam,psonix (sic) swainsonii. — Zool. Journ., ii, Ifo. 5, AvrU, 1825, p. 65. 

 1826. Lesson, [E. P.] Sur un nouveau genre de la famille des Faucons; i)ar Vig- 

 ors. . . . < Fer«s.«. 5((W., 2** se^ct., ix, 1826, p. 91. 

 Nauclerus riocourii. — Extrait du Zool. Journ., ii, 1825, pp. 385-387. 

 1829. Audubon, J. J. Notes on the Bird of Washington (Falco washingtoniana), or 

 Great American Sea Eagle (fig. 53). <^ Loudo7i's Mag. Nat. Hist, i, 1829, pp. 

 115-120. 



1829. Johnson, J. Vision of Birds of Prey. < London's Mag. Nat. Hist. , ii, 1829, p. 473. 

 Erom Medico-OMrurgieal Review. 



1829. "T. F." An Arrangement of the different Species of Falcons found in Great 



Britain. < Loudon's Mag. Nat. Hist., i, 1829, pp. 217-221, figg. 85-90. 

 14 spp., under 6 sections. 



1830. Bennett, [E.T.] [Polyborus ? hypoleucus, sp.n.] <P. Z. S., Dec. 14, 1830, 



p. 13. 

 1830. Brehm, C.L. Die grossen Adler mit befiederten Fussen von Brehm. <^01cen's 



Lsis, Bd. xxiii, 1830, pp. 96-106. 

 Aquila fulva, A. melanaetos, A. chrysaetos "Brehm". 

 1830. Vigors, N. A. Gami^sonyx [swainsonii], eine neue Sippe der Falconiden, 



< Ohen's Lsis, Bd. xxiii, 1830, pp. 839, 840. 

 Aus d. Zool. Journ., ii, 1825, p. 65. 



1830. Vigors, N. A. Nauclerus [riocourii], neue Sippe der Falconiden. <^Oken's Isis, 



Bd. xxiii, 1830, pp. 1042, 1043. 

 TJebers. d. Zool. Journ., ii, 1825, p. 385. 



1831. Anon. The Bald Eagle [Haliaetus leucocephalus]. <C-0. J- Browne's The 



Naturalist, i. No. xii, Dec, 1831, pp. 359-367. 

 Popular account, chiefly compiled from "Wilson. 

 1831. Audubon, J. J. An account of the habits of the American Goshawk (Falco 

 palumbarius, Wils.). <^EdinT). Journ. Nat. Geogr. Sci., iii, 1831, pp. 145-147. 

 Not seen. 

 1831. Bennett, [E. T.] [Remarks on two specimens of Polyborus hypoleucus which 

 had been living in the Society's Garden.] <^ Fhilos. Mag., ix, 1831, pp. 63, 64. 

 Erom P. Z. S., Dec. 14, 1830, p. 13. 



