NATURAL SCIENCES OP PHILADELPHIA. 105 



difficult of approach. I have always observed them solitary and during the 

 coldest portion of the winter along the shores of the Rio Grande. Never ob- 

 served in the mountains either on the Rio Mimbres or Gila to the west, or the 

 Sierra Blanca and Rio Ruidosa to the east and northward. This hawk appears 

 to feed principally upon ducks as far as I have observed, which has been only 

 during the winter season. 



8. Leucopternis Harlani. I have met with this bird on four occasions only, 

 once at the Big Bend of the Arkansaw river, Iadian Territory, in May, 1852, 

 and on three different occasions on the Gila river, in the summer of 1857. I 

 was induced to believe that it breeds high up on this stream, from having ob- 

 served pairs each time when seen on the Gila. 



9. Pcecilopternis borealis. Some of the specimens supposed to be of this 

 species that were obtained are probably P. montanus. 



10. P. lineatus. One specimen only obtained, the only one seen at Fort 

 Thorn, in the winter of '56-57. 



11. P. oxypterus. This hawk I met with and procured on one occasion only, 

 on the Mimbres river, in the winter of '52-'53. 



12. Archibuteo ferrugineus. Met with but once, in the winter of '56-57, 

 on the Rio Grande, near Fort Thorn, where I procured a specimen. 



13. Archibuteo lagopus. Common in winter. 



14. Circus Hudsonius. 



15. Aquila Canadensis. Two only met with, one at the Rio Mimbres in the 

 winter of 1853, the other at Fort Stanton on the Rio Bonita in the spring of '55, 

 both individuals secured. The latter was found fastened to a skunk {M. Ameri- 

 cana) alive, but apparently overpowered by the effluvia given out by the animal. 



16. Hali^tus leucocephalus. 



17. Pandion ham.etus. Rather rare. 



18. Polyborus tharus. But one individual ever met with, in the winter of 

 '56 at Fort Thorn on the Rio Grande, during the coldest portion of the season. 



19. Bubo virginianus. 



20. Otus Wilsonanius. Found, but not abundantly, in all portions of the 

 territory. 



21. Brachyotus Cassinii. Rarer than the preceding. 



22. Athene hypugea. 23. Geococcyx Californianus. 



24. Coccvzus Americanus. Rarely observed, and at no time among the 

 mountains. 



25. Trichopicus Harrisii. A common species in every part of the terri- 

 tory. 



26. Dyctiopicus scalaris. Quite abundant, especially along the mesquite 

 thickets on the Rio Grande. 



27. Sphyrapicus nuchalis. Replaces the varius in New Mexico, the latter 

 named species being unknown there. 



28. S. thyroideus. Found occasionally in all the mountainous portions of 

 the country. Rather rare. 



29. Melanerpes erythrocephalus. During a residence of more than six 

 years in New Mexico, but one individual of this species was observed, in the 

 month of July, '58, upwards of a hundred miles north of Fort Thorn, on the 

 Rio Grande. v 



30. M. formicivorus. Found but occasionally only among the mountains, 

 and only in the vicinity of pine trees. This species is resident throughout the 

 year. 



1859.] 



