156 MNlOTILTIDiE, 



Geothlypis Philadelphia, /8. macgillivrayi, Ridgw. Am. Journ. Sc. ser. 3, iv. p. 459"; Lawr. Mem. 



Bost. Soc. N. H. ii. p. 269"; Bull. U. S. Nat. Mus. no. 4, p. 17 ". 

 Geothlypis Philadelphia, Scl. Cat. Am. B. p. 37 (nee Wilson)''. 

 Sylvia vegeta, Licht. fide Bp. Consp. Av. i. p. 310 ". 

 Geothlypis, sp. ?, Baird, Rev. Am. B. i. p. 327". 



PrsBcedenti similis, sed eiliis albis distinguenda, plaga pectorali quoque absente. (Desor. exempl. ex Guate- 

 mala. Mus. nostr.) 



Hah. NoETH America, Middle and Western Provinces ^^ i^. — MexicqI^, Monterey 

 (Couch^), Mazatlan {Orayson'^% Jalapa {de Oca ^), Orizaba {Sumichrast ^, £otteri^% 

 Choapam and Cinco Senores {Boucard ^), Chihuitan and Tehuantepec city {Sumi- 

 chrast IS) ; Guatemala, Duenas ^^, Coban^ {0. S. & F. B. G.^) ; Costa Eica, San Jose 

 {v. Frantzius^), Barranca {CarmioP); Panama, Volcan de Chiriqui {ArcS^"). 



This species entirely takes the place of G. Philadelphia in Mexico and Guatemala, 

 where it is found during the winter months widely distributed over those countries, but 

 chiefly hanging to the western or Pacific shore. In Southern Mexico it is found on 

 both sides of the Cordillera ; but in Guatemala, though it occurs at Coban ^, we most 

 frequently met with it in the main range near Duenas, where it was abundant at an 

 elevation of about 5000 feet. Beyond Guatemala it passes to Costa Rica and Chiriqui, 

 where it is found in conjunction with its eastern ally G. Philadelphia, in which 

 limited area only these species come into contact, and only here during the winter 

 months ; for in summer the treeless plains east of the Kocky Mountains separate 

 them by a wide interval. The lines of migration of these two birds are very different, 

 G. Philadelphia taking a long flight over the ocean, G. macgillivrayi following in the 

 main the course of the Cordillera. 



Dr. Coues gives a good account of this species in his ' Birds of the Colorado Valley.' 

 In the States it is found only in the Middle and Western provinces, going as far north as 

 British Columbia. Its eastern range is determinied by the limit of arboreal vegetation 

 along the Rocky Mountains. Throughout this range it breeds, its nest being built of 

 various materials, sometimes mosses and sometimes various soft fibrous materials, such 

 as bark-strips and frayed-out plant-stems with fine grasses, and lined with slender 

 rootlets ". The eggs are white, spotted and blotched with very dark brown, reddish 

 brown, and other markings of a neutral tint. 



The bird described but not named by Professor Baird in his ' Review of American 

 Birds ' ^^, and attributed to a species of Geothlypis distinct from G. macgillivrayi, but 

 unknown to him, would now appear to be G. macgillivrayi after all. Salvin examined 

 the specimen at Washington in company with Mr. Ridgway in 1874 ; and this was the 

 conclusion they came to. Similar specimens are in our collection obtained in precisely 

 the same localities as fully plumaged birds, and associating with them. 



