1906 ] Bergtold, Concerning the Thick-billed Parrot. 425 



105. Psaltriparus plumbeus. Lead-colored Bush-Tit. — Abundant 

 about Silver City during fall, winter, and spring. 



106. Regulus calendula. Ruby-crowned Kinglet. — Abundant 

 migrant and common winter visitant throughout the country. 



107. Polioptila caerulea obscura. Western Gnatcatcher. — Casual 

 on Coleman's Ranch in April and May. 



108. Myadestes townsendii. Townsend's Solitaire. — Rather rare 

 in the Pinos Altos country. 



109. Hylocichla guttata auduboni. Audubon's Hermit Thrush. — 

 Arriving from the south about May 6. 



110. Merula migratoria propinqua. Western Robin. — Common as 

 a migrant during March and April. The Western Robin breeds abundantly 

 in the mountains north of Pinos Altos. 



111. Sialia mexicana bairdi. Chestnut-backed Bluebird. — Very 

 common migrant and winter resident, October 1 to April 10. 



112. Sialia arctica. Mountain Bluebird. — Common resident. 



CONCERNING THE THICK-BILLED PARROT. 



BY W. H. BERGTOLD. 



The writer spent several weeks in the fall of 1903 and 1904 in 

 northern Mexico, camped in the Sierra Madra Mountains. The 

 first visit was to the region west of Cases Grandes, wherein are 

 located various Mormon colonies, beginning at Colonia Dublan 

 in the east, and ending at Chuichupa in the west, all on the Gulf 

 side of the Sierra Madra watershed. It was in this region that Mr. 

 Wilmot W. Brown discovered and collected the Thick-billed Parrot's 

 (Rhynchopsitta pachyrhyncha) eggs mentioned by Mr. Thayer in 

 his notes on pages 223 and 224 of 'The Auk' of April, 1906. 



This bird is increasingly common from Chuichupa southward, 

 and was especially an everyday sight during the trip, in 1904, to 

 the mountains west of Parral. And, being so common, it was a 

 matter of considerable surprise to notice that Mr. Thayer speaks of 

 his specimens as "among the first, if not the first eggs of this bird 



