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July, 1908 ANNOTATED I,IST OF TIlE BIRDS OF MESA COUNTY, COLORADO 167 Junction as early as March 4 and nests as early as the last week in April, with young on the wing by June 1. In the higher parts of the County, however, the dates of arrival and nesting are considerably later. My earliest arrival date is March 21 and the earliest nest May 4, while the great bulk of the nests are two weeks later. Raises two broods in a season and the bulk depart in September, altho E. R. Warren has seen it at Grand Junction as late as October 4. lquttal10rnis b0realis. Olive-sided Flycatcher. Information is lacking regard- ing the occurrence of this species within the confines of the County. It is in- cluded in this list on the strength of a single specimen seen during the summer of 1905 at 6800 in Plateau Valley. I do not think it is common anywhere in the County. C0nt0pus richards0ni. Western Wood Pewec. Summer resident. Common. One of the most common Fly- catchers in the higher parts of the County. Frequents the quaking-aspen particularly from 7000 to 10,000 feet where its plaintive calls may be heard continually during the breed- ing season which is late iu June. The writer has not seen it in any abundance below 7000 feet. [Empidonax diffieilis. Wes- tern Flycatcher. The absence of this bird from the list can only be accounted for by tile lack of syste- matic collecting by field xvorkers, as it is a common summer resident thruout the mountains of the State aud nndonbtedly occurs more or less commonly in Mesa County.] Empid0nax trailli. Traill Flycatcher. Prof. Cooke says, "One collected in June, 1893, at Grand Junction by J. A. Loring. The species was not rare and was breeding." [Empidonax h a m m on d i. Hammond Flycatcher, Whatever has been said regarding the XVes- NEST OF THE S.a- PHOEBE; MESA. COUNTY tern Flycatcher xvill apply equally xvell to this species.] Empid0nax wrightii. Wright Flycatcher. Summer resident, common. Fre- quents the open hillsides covered with "buck brush" from 7000 to 9000 feet, where it nests commonly late in June. I have no information concerning its migratory habits. 0t0c0ris alpestris leuc01eema. Desert Horned Lark. Summer resident, not common. Winter resident, abundant. Arrives in small scattered flocks with the first cold weather and in large numbers with the first snow. It remains abund- ant up to about April first when the birds begin to scatter and migrate and by the middle of April is seldom seen. I am of the opinion that most of the birds winter- ing here breed farther north and what few birds breed in the County come in from the south. Miss Eggleston reports it as "abundant both summer and winter" at