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Show 814 APPENDIX C- BIRDS. BIRDS. By SPENCEB F. BAIRD. 1. BUTEO BOREALIS, Bp.- Red- tailed Hawk. Fako borealit, Wile. VL 72, pL 62.- Aud. Biog. L 266, pL 51. Salt Lake. Found by Gambel in California. 2. ACCIPITER FU8CU8, Bp.- Sharp- shinned Hawk. Falco veloz, Wile. VII. 110, pL 46, fig. 1 ( young female). Fakopttuuylvanicus, Wile. VL 18, pL 16, fig. 1 ( adult male). Fakoftmw, And. Biog. IV. 622, pL 874. Salt Lake. 8. ATHENS HYPUGAEA, Oassin.- Burrowing OwL Strix hypugcea, Bp. Am. Orn. I. 72, pi. 7. " Am ctmicularia, And. Biog. V. 264, pi. 482, t 2. Athene tociaftf, Gambel, Pr. A. N. 8. m. 47. Abundant in the valley of Salt Lake and on the plains east and west of the mountains. 4. SIAXIA MACBOPTBBA, 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. arctica 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 8. arctica of Swainson shot at Fort Franklin, Great Bear 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 8. 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 |