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176 THE CONDOR VoL. X classes this bird as resident and says, "While not as common as the Northern Shrike it is found in limited numbers near Grand Junction. In the fall and early spring it has a voice not unlike the mockingbird tho not so varied. Grasshoppers and occasionally even mice are seen hanging from the barbs of the wire fences, im- paled by the shrikes. The bird seems to like human companions and nests in the chico near some dwelling." Mr. Sullivan also classes it as resident but never very plentiful, and says it breeds near Grand Junction. Mr. E. R. Warren writes, "One or two seen September 26, and on October 4 several more seen between. Grand Junction and Palisades. The writer has seen the bird occasionally in Pla- teau Valley during the summer, but never in the winter. Vireo gilvus swainsoni. Western Warbling Vireo. Summer resident, com- mon. A rather late arrival in the spring, and goes at once into the Well timbered country, where it breeds late in June, mostly about 7500 feet, frequenting creek bottoms and nesting in cottonwoods. A very inconspicuous bird and probably a larger part of its occurrence is overlooked by observers in the field owing to its seclusive habits. [Vireo solitarius plumbeus. ?lumbeous Vireo. A common summer resident thruout the mountains of the State. Should thus be found in more or less abundance thruout eastern Mesa County.] Helminthophila virgini/e. Virginia Warbler. Regarding this bird Miss Eggle- ston writes, "Regular migrant, possibly occasionally breeding. These birds are so quick in their movements, that they are hard to watch. They come when the early trees leaf out and are quite common until the heat of summer drives them to higher altitudes." Prof. Cooke states that "in western Colorado it is abundant in migration and in many places is the most common warbler during the breeding season." Thus it is probably more or less abundant during the sumruer thruout the higher portions of the County. [Helminthophila celata lutestens. Lutescent Warbler. A not uncommon Summer resident thruout western Colorado. Undoubtedly occurs in more or less abundance thruout the mountains of Mesa County, altho there are no definite records of its occ?rrence up to date.] Dendroica/estiva. Yellow Warbler. Summer resident, abundant. By far the commonest breeding warbler thruout the County up to at least 7000 feet. Arrives the first of May and breeds in June. Nests of this bird seem to be the favorite re- ceptacle for eggs of the Cowbird. Much more common below 6500 feet than above. Probably the Grand River bottom is the center of abundance of the species in the County. Departs south early in September. Mr. Sullivan's extreme dates of ar- rival and departure are April 28 and September 7. Dendroica auduboni. Audubon Warbler. Summer resident, common; in mi- gration abundant. Strictly a bird of the higher altitudes during the br&eding season, when it frequents heavy coniferous timber from 8000 to 10,000 feet. Dur- ing the fall migration especially it is very plentiful thruout the lower part of the County. Arrives early in May (May 7 is my earliest ddte), breeds thruout June and July and the southward migration begins late in August, altho Mr. Warren has' seen it at Grand Junction as late as September 27. Dendroica nigreseens. Black-throated Gray Warbler. The only information at hand regarding this species comes from Mr. Sullivan who says, "A single one seen in front of my house May 12, 1904." This species should occur as commonly in Mesa County as in any county in the State, but is never plentiful anywhere within the State. [Dendroica townsendi. Townsend Warbler. Cooke says, "A western species coming east to the base of the foothills. Rather rare in summer, breeding from 5500 to 8000 feet in western Colorado.]