326 APPENDIX C. — BIRDS. 



We have dedicated this species to its accomplished discoverer, 

 Lieutenant Jas. W. Abert. 



3. Agelaius xanthocephalus, L. — Yellow-headed Blackbird. 



4. Picus VARius, L. — ^Yellow-bellied Woodpecker. 



5. CoLUMBA leucopteba, L. — White-winged Dove. 



6. Callipepla squamata, Vig. — Blue Partridge. 



7. Callipepla gambeli, Nutt. — Gambel's Partridge. 



Callipepla gamheli, Nutt. Pr. A. N. S. Phila. 1843. 

 Callipepla venusta, Gould, Pr. Zool. Soc. 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 long- 

 est measuring If inches in length. Inner webs of scapulars mar- 

 gined with reddish. Tail much rounded, of twelve feathers ; outer 

 1\ inches shorter than the central. Wing, 4f inches ; tail, 4 ; tar- 

 sus, 1. 



8. AcTiTUBUS BARTRAMius, Wils. — Field Plover. 



9. Recurvirostra 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 2f inches instead of 2 inches ; 

 and the tarsus 4 instead of 3J- inches. The hind claw is nearly 

 obselete. Bill 3} inches long. 



Found abundantly in New Mexico and California. 



