764 Annals of the Carnegie Museum. 



U. S. Nat. Museum: La Lagunaria de Dota (Basulto). 



Bangs Collection: Boruca (Underwood). 



Carnegie Museum: Boruca and Ujurras de Terraba (Carriker). Four 



specimens. 



In Costa Rica this race of H. prostheleuca is confined to the extreme 

 southwestern portion of the country, probably getting no farther north 

 than the Dota Mountains. Its habits and altitudinal range are the same 

 as those of the preceding species, although I took a specimen (and saw 

 others) at about 7,000 feet elevation in the mountains above Ujurras, in 

 company with H. leucophrys collina, which is rather unusual. One of 

 these birds had developed a very beautiful song and sang several times 

 each day close by our camp, and whenever he started we all stopped 

 work to listen. 



545. Thryorchilus browni ridgwayi (Bangs). 



Thryorchilus ridgwayi Bangs, Proc. Biol. Soc. Wash., XIX, 1906, 108 (Volcan de 

 Irazii, (c? 1 ?), C. F. Underwood, Mar. 4, 1899; coll. E. A. and O. Bangs; Irazu, 

 May, 1905, one specimen [Alfaro]); Proc. N. Eng. Zool. Club, IV, 1908, 30 

 (Volcan de Irazu, four specimens [Underwood]). 



U. S. Nat. Museum: Volcan de Turrialba, 9,680 feet (Ridgway and Zele- 



don), San Juan de Irazii (Alfaro). 

 Bangs Collection: Volcan de Irazu, four specimens (Underwood). 

 Carnegie Museum: Volcan de Irazu, one specimen; Volcan de Turrialba, 



eight specimens (Carriker). 



This recently discovered and very local race of Thryorchilus browni has 

 been found thus far only on the Volcanoes Irazu and Turrialba. The 

 first specimen was taken on Irazu by Underwood in 1899, but remained 

 unknown in his collection until received by Mr. Bangs in 1905. I secured 

 a single specimen from Irazu in 1902, which also remained undetected in 

 the collection of the Carnegie Museum. In 1907, while collecting on the 

 Volcan de Turrialba, I found the bird very abundant in the scrub just at 

 timber-line and among the low bushes above timber-line, nearly up to the 

 summit of the crater. 



It is very tame, but keeps hidden away among the bushes and brush- 

 heaps so that it is hard to shoot. It is also found commonly among the 

 bamboos just below timber-line, like T. browni on the Volcan de Chiriqui. 

 Under the description of the species Mr. Bangs states that there is no cane 

 (bamboo) on Irazii, but he was evidently wrongly informed on this point, 

 because on the northern and eastern sides of the mountain it is very abun- 



