1890.] NATURAL SCIENCES OF PHILADELPHIA. 217 



25. Thryothorus bewickii bairdi Salv. A- (iodin. Baird's Wren. 

 Common all over the plain, but not found in the town or on the 



mountain. 



26. Troglodytes brunneicoUis Scl. Tawny-throated Wren. 



In the pine forest of Orizaba at 10,000-13,000 ft.; also found on 

 Popocatepetl at 10,000 ft. 



27. Certhia familiaris mexicana (<41og.). Mexican Creeper. 



In the pine forest of Orizaba from the lower border to an altitude 

 of 11,000 ft. It also occurred on all the other mountains. 



28. Sitta carolinensis aculeata (Cass.). Slender-billed Xuthatch. 



From the lower edge of the forest to 10,000 ft. above. Seen also 

 on Ixtaccihuatl at 10,000 ft. elevation. 



29. Parus meridionalis Scl. Mexican Chickadee. 



Common in the pine and spruce forests from about 11,000 ft. to 

 the limit of tree growth. 



30. Psaltriparus melanotis (Harlt.). Black-eared Bush-Tit. 



Common on the sandy plain between Chalchicomula and the Peak 

 of Orizaba. 



31. Regulus calendula (Linn.). Ruby-crowned Kinglet. 



Rather common on the lower edge of the pine forest. Seen also 

 on Ixtaccihuatl at 9,000 ft. elevation. 



32. Merula migratoria (Linn.). Robin. 



This .species occurred in the pines of Orizaba at 9,000 ft., and on 

 all the other mountains at an altitude of 9,000-11,000 ft. 



33. Sialia mexicana Sw. Western Bluebird. 



Common on Orizaba from the lower edge of the forest to about 

 11,000 ft. Also seen on Popocatepetl and Toluca at about the same 

 altitude. 



In addition to the collections above described Mr. Baker procured 

 a few other specimens at several localities in the western jiart of 

 Mexico. 



At Lake Patzcuaro on May 1st he collected : — ' 



Aythya collaris (Donov.). Ring necked Duck. 

 Plegades guarauna (Linn.). White-faced (Tlossy Ibis. 

 Botaurus exilis (<;mel.). Least Bittern. 

 Fulica americana ((imel.). American Coot. 

 Tyrannus vociferus Sw. Cassin's Kingbird. 



