1924] Swarth: Birds and Mammals of the Skeena River Region 321 There are, it is true, a number of birds found at sea level on the coast and in the lowlands of the Hazelton region, represented either by the same species or subspecies in both places, or by closely related subspecies, but these are mostly wide-ranging forms, not closely con- fined within any particular zone. Some such species are: Ceryle a. caurina Spinus p. pinus Melospiza m. morphna Melospiza 1. lincolni Hirundo erythrogaster Planesticus m. migratorius There are eighteen such cases. Turning now to conditions at high altitudes, we find the following birds in summer at timber line (Hudsonian Zone) on Nine-mile Mountain: Dendragapus o. flemingi-~ Canachites franklini Perisoreus ¢. canadensis Loxia leucoptera Zonotrichia coronata Passerella i. annectens Dendroica townsendi Wilsonia p. pileolata Nannus h. pacificus Certhia f. occidentalis Sitta canadensis Penthestes g. abbreviatus Penthestes h. columbianus Regulus s. olivaceus Regulus ¢. calendula Hylocichla g. guttata Txoreus n. naevius Of these seventeen species, just four (Perisoreus c. canadensis, Zonotrichia coronata, Penthestes g. abbreviatus, and Penthestes h. columbianus) are not found upon the coast. The others, represented either by the same species or by closely related complementary sub- species, are mostly common and characteristic birds of the forests at sea level in the coastal region. In general, the avifauna at sea level on the coast is thus scen to be closely similar to that found just below timber line (4500 feet altitude), two hundred miles inland. Tt is of interest to note that muskeg surroundings in the valleys of the upper Skeena region produced certain birds usually found in the Hudsonian Zone. Occasional pairs, at wide intervals, were thus noted of the following species: Picoides arcticus Picoides a. fasciatus Sitta canadensis On the treeless summit of Nine-mile were found breeding: Lagopus 1. alexandrae Lagopus rupestris Lagopus |]. leucurus Otocoris a. arcticola Regulus s. olivaceus Regulus ¢. calendula Txoreus n. naevius Mountain the following birds Leueosticte t. littoralis Passerculus s. alaudinus Anthus rubescens