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Show 314 . APPENDIX 0,- BIRDS. BIKDS; BY SPENCER P. BAlKD. - . •> ^ - 1. BUTEO BOREALIS, Bp.- Red- tailed Hawk. Fako borealis, Wils. VI. 72, pi. 52.- Aud. Biog. L 265, pL 51. Salt Lake. Found by Gambel in California. 2. ACCIPITEB FU6GUS, Bp.- Sharp-* hinned Hawk. Falcovelox; Will. VII. 110, pi. 46, fig. 1 ( young female). Fako penneylvanicue, Wils. VI. 18, pi. 16, fig. 1 ( adult mile). Falcoftucus, Aud. Biog. IV. 622, pi. 874* Salt Lake. 8. ATHENS HYPUGABA, Cassia.- Burrowing Owl.. Strix hypugcea, Bp. Am. Orn. I. 72, pi. 7. ' Strix cunicularia, And. Biog. V. 2* 4, pL 482, f. 2. . Athene eoddlie, Gamtol, Pr. A- N. 8. IIL 47. Abundant in the valley of Salt Lake and on the plains east and west of the mountains. 4< SIALIA MACEOPTERA, Baird.- Long- winged Bluebird. MALE.- Salt Lake City, March 18,1850. A specimen of Sialia was procured by Captain Stansbury, which, at . first sight, was referred to S. arotica of Swainson. On comparing it with others from Fort Union, the differences were found to be sufficiently great to constitute a distinct species. The Fort Union specimen was clearly referable to * S. arctica of Swainson shot at Fort Franklin, Great Sear Lake, so that it becomes necessary to impose a new name upon the one from Utah. Not. having at hand specimens from the Pacific coast, it is impossible to say to which species the birds described , by Audubon as S. arctica belong, ( probably arctica.) The principal difference between the two allied species is to Be found • in the longer wings, and much smaller and weaker claws, with rather longer toes, of the S. macroptera, as will . be sufficiently |