76 Lincoln, Birds of the Clear Creek District, Colo. [j" n 



Arrives before May 15, is nesting by June 10 and fledglings out of the nest 

 are of note by July 15. 



Toxostoma rufum. Brown Thrasher. — Summer resident; com- 

 mon. Arrives, nests and leaves about the same dates as D. carolinensis. 



Salpinctes o. obsoletus. Rock Wren. — Migrant; not common. 

 The enormous piles of boulders thrown up in the days of placer mining 

 here, are usually occupied by one or two Rock Wrens during the late sum- 

 mer and early fall. Nests in the foothills. 



Catherpes m. conspersus. Canon Wren.- — Resident, but not 

 common on the Hogback. Their call is exceptionally ventriloquil, 

 and being an adept at dodging behind and beneath rocks and bushes, this 

 handsome wren is hard to locate. Seven noted on this ridge, January 1, 

 1912, four of which were secured. Their song and call are unusually 

 melodious, even for a wren, and could be confused with no other bird. 



Troglodytes a. parkmani. Western House Wren. — Summer 

 resident; plentiful. The familiar House Wren is found everywhere, where 

 the underbrush is to his liking. On one occasion (June, 1909) a pair made 

 their nest in a crack of a cottonwood, which was so situated, that in order 

 to enter they had first to pass through my tent. Deserted Flicker holes 

 are also used as nesting apartments. 



Telmatodytes p. plesius. Western Marsh Wren. — Migrant; not 

 common. Only seen in April. The willows on the right of way of the 

 interurban electric fine, are periodically cut and piled, making retreats 

 especially favored by marsh wrens. I have taken a few each year. 



Certhia f . montana. Rocky Mountain Creeper. — Rare. I find 

 but three records of the occurrence of this bird in the creek valley, although 

 they are not uncommon in the Yellow Pines of the adjoining foothills. I 

 observed one October 30, 1909, and Mr. Rett has two others taken Novem- 

 ber 14, 1916 and December 30, 1917. 



Sitta c. nelsoni. Rocky Mountain Nuthatch. — Ordinarily, not 

 common in the valley but during September and October, 1910, several 

 were noted and a few secured. More numerous in the foothills. 



Sitta p. pygmsea. Pygmy Nuthatch.— Pygmy Nuthatches are 

 plentiful winter residents of the Yellow Pine zone, but I have never known 

 them to enter the belt of cottonwoods and willows immediately below. 



Penthestes a. septentrionalis. Long-tailed Chickadee. — Winter 

 resident; plentiful. In the fall, both septentrionalis and gambeli are found 

 in the same flocks, and in about equal numbers, but gambeli soon leaves its 

 long-tailed cousins in complete possession for the winter. The Long-tails 

 also reach the valley first, usually by the first of August. 



Penthestes g. gambeli. Mountain Chickadee. — Migrant; plenti- 

 ful. Its absence in the winter is only from the first of November to the 

 middle of March. 



Regulus c. calendula. Ruby-crowned Kinglet. — Migrant; com- 

 mon, more so some years than others. Generally more numerous in the- 

 fall. 



