Vol iao7^ IV ] Bangs, Birds from Western Costa Rica. 311 



Three "Bogota" skins of Buarremon assimilis measure respectively as 

 follows: wing, 79, 78, and 79.5; tail, 78, 75 and 78; tarsus, 30, 30 and 30; 

 culmen, 16, 16 and 15.5. 



Remarks. Lawrence, in 1868, very doubtfully referred to Buarremon 

 assimilis a specimen from Guiatil, Costa Rica, he then had in hand, point- 

 ing out differences between it and South American examples; Salvin, how- 

 ever, afterward examining the same skin, came to the conclusion it did 

 not differ at all from South American examples. 



The large series taken by Underwood shows very pronounced and con- 

 stant differences from B. assimilis of Colombia and southward, and as no 

 bird of this sort has ever been taken in Chiriqui or Panama, I am inclined 

 to accord the Costa Rican Buarremon full specific rank. 



Though wholly wanting or exceedingly rare in other parts of Costa Rica, 

 Underwood found Buarremon costaricensis an abundant bird in the Rio 

 Grande region. 



Volatinia jacarini splendens (Vieill.). Thirteen specimens, both sexes, 

 Boruca and Paso Real, May-July. 



Sporophila gutturalis (Licht.). One adult male, Pozo del Rio Grande, 

 April 18. 



This is a new bird to Costa Rica, and I believe has before been taken on 

 the continent no farther north than on the line of the Panama Railroad. 



Sporophila aurita (Bonap.). Thirty-eight specimens, adults of both 

 sexes and young males, Boruca, Paso Real, Barranca and Pozo del Rio 

 Grande, April-August. 



The adult males from this series — twenty-one in number — ■ show, 

 for this species, remarkably little individual variation, there being no very 

 black ones and none with white throats. All have black throats and breasts, 

 white rumps and bellies and a semicircle of white on each side of the neck, 

 are practically all alike, and represent the phase of plumage named by 

 Lawrence S. semicollaris, except that the rump is slightly more extensively 

 white. 



Sporophila morelleti morelleti (Bonap.). Four specimens, two adult 

 males, one young male and one young female, Pozo del Rio Grande, April 

 and August. 



Amaurospiza concolor Cabanis. One adult male of this rare species, 

 Boruca, June 16, 1906. 



Cyanocompsa concreta cyanescens Ridgw. Forty-nine specimens, both 

 sexes, Boruca, Paso Real and Pozo del Rio Grande, April- August. 



Oryzoborus funereus Sclater. Four adults, both sexes, Boruca and 

 Barranca, June. 



Saltator magnoides intermedius (Lawr.). Eighteen specimens, adults 

 of both sexes and one young in nestling plumage, Boruca, Barranca, Pozo 

 del Rio Grande and Barranca Puntarenas, April-August. 



These skins represent S. magnoides intermedius, differing in no way 

 from specimens from Panama, except that in the series there is not an 

 example with the black band across the chest broken or wanting; the 



