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Show 326 APPENDIX C.- BIRDS. We have dedicated this species to its accomplished discoverer. Lieutenant Jas. W. Abert. 3. AGELAIUS XANTHOOEPHALUS, L.- Yellow- headed Blackbird. 4. Picus VARIUB, L.- Yellow- bellied Woodpecker. 5. COLUMBA LEUCOPTERA, L.- White- winged Dove. 6. CALLIPEPLA SQUAMATA, Vig.- Blue Partridge. 7. CALLIPEPLA GAMBELI, Nutt,- Gambel's Partridge. Calliptpla gambdi, Nntt Pr. A. N. S. Phila. 1848. Callipqtla vmttuta, Gould, Pr. Zool. Soa Lond. 1846. Upper parts and breast, lead colour; crown and occiput, chestnut. Base of bill, lore, chin, throat and sides of the neck, black, bounded by a white band, broader on the sides. The eyes are included in this black hood. The chestnut of the crown is margined with white, bordered on each side with black. The lead- coloured feathers of the sides and back of the neck are streaked with black along the shafts. Sides, deep chestnut, broadly lineated with yellowish white. Lower breast, whitish yellow. Indications of a black patch on the belly. Under tail- coverts dull white and black. A long recurved crest of six ( remaining?) keeled black feathers, the longest measuring I f inches in length. Inner webs of scapulars margined with reddish. Tail much rounded, of twelve feathers; outer 1£ inches shorter than the central. Wing, 4 } inches; tail, 4; tarsus, 1. 8. ACTITURTJS BARTRAMIUS, Wils.- Field Plover. 9. REOURVIROSTRA OCCIDENTALIS, VIG.- White- headed Avoset. This species resembles R. americana in the general pattern of its markings, but differs in having a pale- grayish white to replace the buff of the head and neck. It is also decidedly larger, the uncovered part of the tibia measuring 2} inches instead of 2 inohes; and the tarsus 4 instead of 3£ inches. The hind claw is nearly obsclete. Bill 3J inches long. Found abundantly in New Mexico and California. |