^° 190^7 IV ] Bangs, Birds from Western Costa Rica. 305 



Henicorhina prostheleuca pittieri (Cherrie). Seventeen specimens, 

 adults and young of both sexes, Boruca, May-July. 



Thryophilus semibadius (Salv.). Nineteen specimens, adults and young 

 of both sexes, Boruca, Paso Real, Pozo del Rio Grande and Lagato, April- 

 July. 



Thryophilus pleurostictus ravus Ridgw. Four specimens, two adult 

 males and a young male and young female, Barranca Puntarenas, August. 



Thryophilus rufalbus castanonotus Ridgw. Fifteen specimens, adults and 

 young of both sexes, Boruca, Paso Real and Lagato, May and July. 



Thryophilus modestus modestus (Cabanis). Twenty-two specimens, 

 adults and young of both sexes, Boruca, Paso Real, and Pozo del Rio 

 Grande, April-August. 



Skins from the Rio Grande region of Costa Rica are not extreme T. 

 modestus, but are intergrades between that form and T. modestus elutus; 

 on the whole, however, I think them rather nearer to modestus than to 

 elutus. 



VlREONID.E. 



Vireosylva flavoviridis flavoviridis Cassin. Nineteen specimens, adults 

 of both sexes and two young, Boruca, Paso Real, and Barranca, April-July. 



Vireosylva philadelphica Cassin. One female, Boruca, May. 



Pachysylvia decurtata (Bonap.). Twenty-four specimens, adult and 

 young of both sexes, Boruca and Pozo del Rio Grande, May-August. 



This series does not average any smaller than specimens in my collec- 

 tion from Vera Cruz, Mexico, neither can I detect any constant differences 

 in coloration, and I am inclined to believe the southern subspecies pusillus 

 of Lawrence cannot be maintained, although Ridgway, 'Birds of North 

 and Middle America,' Part III, page 217, footnote, seemed rather to think 

 it might. 



Pachysylvia ochraceiceps pallidipectus Ridgw. Thirty specimens, adults 

 and young of both sexes, Boruca, Paso Real, Lagato, Barranca and 

 Pozo del Rio Grande, April-August. 



Young in nestling plumage are very different in color from adults, hav- 

 ing the entire upper parts dark cinnamon, and the under parts, except 

 under tail coverts which are greenish yellow, pale cinnamon mixed with 

 whitish — the throat mostly whitish. From this plumage they moult into 

 the livery of the adult; three skins in the above series being in process of 

 such a change. 



Pachysylvia viridiflava (Laivr.). One adult male, Boruca, June 16. 



Hirundinid.e. 



Progne chalybea chalybea (Gmel.). Seven specimens, adults and 

 young of both sexes, Boruca and Paso Real, May and July. 



Stelgidopteryx ruficollis uropygialis (Lawr.). One adult female, Pozo 

 del Rio Grande, April 4, 1906. 



Iridoprocne albilineata {Lawr.). Eight specimens, adults and young of 

 both sexes, Barranca Puntarenas, August. 



