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 162 THE CONDOR VoL XVIII regions of the Rockies, and its avifauna has probably been little changed through human agencies. At Riverside the elevation of the river is about 3200, and at Cabin Parks about 3500 feet. The mountains enclosing the valley rise to about 8000 feet. Western larch and Douglas fir are the principal tree species, with a mixed stand of western white pine here and there, and with Engelmann spruce at the higher altitudes. Open burns and grassy mountain parks occur quite frequently, though the valley is essentially a forest cov- ered region. Mergus americanus. Merganser. Common in small flocks. Seen at Coalbank, Cabin Parks and Spotted Bear. One flock of seven appeared at camp, attracted by trout entrails thrown into the river. Their ability as swimmers was well demonstrated by the ease with which they made headway against the swift current of the river. Helodromas solltarlus olnnamomeus. Western SoIttary Sandpiper. Two birds seen at Cabin Parks. Actiris maculaHa. Spotted Sandpiper. Common along the river at all camps. Canachltes frankllni. Franklin Grouse. The "Fool-hen" was quite common along the main trail and elsewhere. Bonasa umbellus, subsp. Ruffed Grouse. The Ruffed Grouse was nearly as com- mon as the Franklin, and found frequenting the same localities. Buteo borealis calurus. Western Red-tail. One seen at Riverside. Hallaeetus leucocephalus leucocephalus. Bald EagJe. One seen near Riverside. Acciplter velox. Sharp-shinned Hawk. One found dead in the trail near Coalbank. Falco sparverlus, subsp. Sparrow Hawk. One seen at Hungry Horse Ranger Station near Riverside. Pandion hallaetus carolinehals. Osprey. Well distributed along the river. Two old nests were noted. Otus aslo, subsp. Screech Owl. The familiar calls of screech owls were heard at Cabin Parks and Spotted Bear. Bubo virginianus, subsp. Western Horned Owl. The hooting of Horned Owls was heard several times. Presumably Ceryle alcyon alcyon. Belted Kingfisher. Common all along the river. Dryobates villosus montlcola. Rocky Mountain Hairy Woodpecker. Common along the river trail, and noted at 6500 feet in Silver Basin. Picoides arcticus. Arctic Three-toed Woodpecker. Plcoides americanus dorsalis. Alpine Three-toed Woodpecker. Both species of the three-toed woodpeckers were quite common in the vicinity of Coalbank where there was considerable bug-infested western white pine. Two of the Arctic Three-toed Wood- peckers were also seen at Cabin Parks. Sphyrapicus varius nuchalls. Red-naped Sapsucker. One bird seen in a clump of aspen at Spotted Bear. Phloeotomus plleatus abietlcola. Northern Pileated Woodpecker. Quite common and well distributed throughout the valley. Colaptes cafer collaris. Red-shafted Flicker. Common along the main trail. Choralelies virginianus henryl. Western Nighthawk. Common at all camps. Swift. Swifts were seen flying overhead at Cabin Parks but were not identified. Tyrannus tyrannus. Kingbird. One seen at Riverside. Flycatchers of any type were notably lacking throughout the trip. Cyanocitta stelleri annectens. Black-headed Jay. A few were seen at Coalbank and Riverside. Not numerous. Perisoreus canadensis capitalIs. ' Rocky Mountain Jay. Common. Corvus corax slnuatus. Raven. Common and very noisy. UsualIy seen close to the river. Nuclfraga columblana. Clarke Nutcracker. Common and noisy. Molothrus ater ater. Cowbird. One which was seen at Coalbank persisted in alighting on the backs of the horses. Pinlcola enucleator montana. Rocky Mountain Pine Grosbeak. Two seen in Doug- las fir on Spotted Bear Mountain. Carpodacus cassini. Cassin Purple Finch. One seem at Coalbank. Loxla leucoptera. White-winged Crossbill. One male and two females were seen