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172 THE CONDOR VoL. X abundant. Probably the most abundant breeding sparrow in the County. Arrives from the south the middle of April and breeds during May, June and July, raising two broods. Frequents cultivated sections and breeds abundantly in young grain and alfalfa fields up to at least 8000 feet. During late summer they are found in great numbers in the freshly cut hay and grain fields. Leaves for the south in October. Passerculus sandwichensis a!audinus. Western Savanna Sparrow. Summer resident, common. Arrives about the middle of April and breeds during May, June and July to at least 8000 feet, and raises two broods. Its favorite nesting site is in the alfalfa fields, where it conceals .its nests in the dense alfalfa plants close to or upon the ground. In company with the Western Vesper Sparrow, Western Lark Sparrow and Western Chipping Sparrow it is abundant in the hay fields in late summer. Chondestes grammacus strigatus. Western Lark Sparrow. Summer resident, common. Not as frequently met with as the two preceding species, but by no means of uncommon occurrence. Their general habits do not differ greatly from the preceding. Mr. Sullivan's extreme dates of arrival and departure are April 1 and September 22. Zonotrichia leucophrys. White-crowned Sparrow. I have occasionally ob- served this bird in migration but have no information relative to its resident abun- dance. Judging from the fact that Carter fouud it breeding .abundantly at Breckenridge I am inclined to think it is a regular summer resident in the higher portions of the County. Mr. E. R. Warren took one at Grand Junction October 2, 1905, and Mr. Sullivan considers it a common migraut there. Zonotrichia leucophrys gambeli.. Intermediate Sparrow. Mr. Sullivan in speaking of this species at Grand'Junction writes, "Common migrant. The most numerous of all the migrating sparrows. I have seen them here all winter (1903-4). Usually they disappear altogether. They are usually in the country from the south by April 1 to 15 and return October 1 to December 15. Spizella monticola ochracea. Western Tree Sparrow. Winter resident, abun- dant. The only sparrow occurring in any abundance during the winter months. Arrives in October and November and frequents wooded or cultivated sections up to at least 7500 feet. By April 1 nearly all have departed for their northern breed- ing grounds. Spizella socialis arizonee. Western Chipping Sparrow. Summer resident, com- mon. Arrives about the middle of April (my earliest date is April 2, 1902), and breeds up to at least 8000 feet, during May and June. It is more common below 6500 feet than above and frequents cultivated regions. It is particularly abundant during August and September in the hay fields. Mr. E. R. Warren has seen it at Grand Junction as late as October 3. Junco montanus. Montana Junco. Prof. Cooke says, "Several were seen and one collected, in late September, 1906, by Merritt Cary a few miles north of the northern line of the County. A day or two later he saw a flock of birds, inside the county limits that were undoubtedly the same species." Junco aikeni. White-winged Junco. Junco byemalls connectens. Coues Junco. Junco mearnsi. Pink-sided Junco. Winter residents, abundant. All three of these Juncos occur abundantly thruout the winter, but I have very little definite in- formation as to their relative abundance. Mr. Sullivan says that co2?neclens is the commonest form found at Grand Junction. The bulk of the northward migration 'occurs about April 1. Junco caniceps. Gray-headed Juuco. Summer resident. During the summer