^^fm'] PROCEEDINGS OF THE NATIONAL MUSEUM. 485 



27. Geothlypis trichas (I.inii.). 



Common, first observed October 28. 



28. Geothlypis bairdi Nutting. 



Common on the Eio Frio in Costa Rica. One specimen taken at Grey- 

 town and one at Colorado Junction, on the San Juan. Rare on the 

 Escondido, where I got an adult male May 29, and a young" bird in first 

 plumage June 5. 



29. Geothlypis caninucha icterotis Ridgw. 



Rather common on the Escondido, First specimen shot May 17. 

 Next seen August 17, when an immature male was shot. Later it be- 

 came quite common, and individuals were frequently heard. The note 

 is loud and clear. The birds are found in the tall grass along the river 

 banks. They may breed here, but if so are very retiring, as I saw none 

 during the summer. 



30. Icteria virens (Linn.). 



Uncommon, apparently. First seen October 14, and specimen ob- 

 tained at Greytown February 14. 



31. Sylvania mitrata ((ilmeL). 



Very common. First seen September 24 ; taken at Greytown Feb- 

 ruary 5. 



32. Setophaga ruticilla (Liun.). 

 Very common; first seen September 20. 



33. Basileutenis leucopygius Scl. and Salv. 



Common on the Rio Frio in March. The bird has habits very similar 

 to Seiurus motacilla, and its note is very much the same. Instead of 

 jerking the tail up and down it flirts it continually after the manner of 

 a Redstart [Setophaga ruticilla), and at times resembles this bird in 

 habits more than the Seiurus. The song is loud and clear, and very 

 melodious, resembling somewhat that of a Field Sparrow {Spizella pu- 

 ffilla), with several variations. 



Found usually along streams, but often wanders into clearings, 

 where it hops along fallen trees and on bare patches of ground. The 

 birds were found almost invariably in pairs. 



Family HIRUNDIMD^. 

 34. Progne subis hesperia Brewst. 



A pair shot September 13 on the Escondido out of a flock of six or 

 eight, which had settled in the top of a dead tree during a shower. 

 This appears to be considerably south of the other records for this 

 si)ecies. 



