Part 34

758a. =Olive-backed thrush.= HYLOCICHLA USTULATA SWAINSONII. Rare migrant.

758c. =Alma's thrush.= HYLOCICHLA USTULATA ALAMÆ. Rare summer resident; in migration common.

759. =Dwarf hermit thrush.= HYLOCICHLA AONALASCHKÆ. Rare migrant.

759a. =Audubon's hermit thrush.= HYLOCICHLA AONALASCHKÆ AUDUBONI. Common summer resident; breeds from 8,000 feet to timber-line.

759b. =Hermit thrush.= HYLOCICHLA AONALASCHKÆ PALLASII. Rare migrant; comes to the eastern edge of Colorado, just touching range of auduboni.

761. =American robin.= MERULA MIGRATORIA. Summer resident, but not common; some interesting questions arise in connection with intermediate forms.

761a. =Western robin.= MERULA MIGRATORIA PROPINQUA. Abundant summer resident; breeds from plains to timber-line.

765a. =Greenland wheatear.= SAXICOLA OENANTHE LEUCORHOA. European species; a straggler taken at Boulder by Minot.

766. =Bluebird.= SIALIA SIALIS. Rare summer resident; west to base of Rockies.

767a. =Chestnut-backed bluebird.= SIALIA MEXICANA BAIRDI. Summer resident; not common; western form, coming east as far as Pueblo.

768. =Mountain bluebird.= SIALIA ARCTICA. Abundant summer resident; breeds from plains to timber-line; in autumn roams up to at least 13,000 feet.

INDEX

Aerial song, 50, 51, 86, 87, 239, 268-270, 286, 287, 299-301.

Aiken, Charles E., xiii, 50, 63, 67, 118, 134, 136, 157, 161.

Arvada, 193, 194, 278, 289, 301.

Blackbird, Brewer's, 25, 98, 125, 126, 133, 139, 140, 141, 187, 215, 230, 259, 264, 266, 268, 271-274. red-winged, 98, 142, 215, 271. yellow-headed, 141, 142.

Bluebird, mountain, 22, 55, 67, 99, 128, 192, 231, 237, 259.

Bobolink, 286, 287, 289.

Boulder, 162, 178, 184, 186, 206, 279, 282.

Breckenridge, 259, 293, 294, 302.

Buena Vista, 32, 38, 112, 127, 132-136, 139, 146, 162, 193, 267.

Bunting, lark, 187, 285-292. lazuli (also called finch), 25, 121, 154-159, 178, 187, 290.

Burro ride, 223-256.

Butterflies, 177, 252, 253, 266.

Canary, 127.

Cañon, Arkansas River, 43, 117. Cheyenne, 109, 170. Clear Creek, 184, 187, 197. Eagle River, 117, 125. Engleman's, 40. Grand River, 44, 125. South Platte, 206, 259, 278-282, 293.

Catbird, 31, 36, 121, 133, 189.

Chat, yellow-breasted, 186. long-tailed, 186.