296 Bangs, Birds from Western Costa Rica. [July 



Thalurania oolumbica venusta (Gould). Forty-four adults, both sexes, 

 Boruea, Barranca and Pozo del Rio Grande, May-August. 



Elvira chionura (Gould). One adult female, Boruea, June 30. 



This appears to be a rare bird in Costa Rica; though it has been before 

 recorded from the Republic, I can find no exact localities; like other 

 Panaman forms that extend into Costa Rica it probably reaches only to 

 the Pacific slope. 



Colibri delphinae (Less.). One adult male, Boruea, May 21. 



Heliothrix barroti (Bourc. & Muls.). One adult female, Paso Real, July 

 16. 



Floricola superba (Share). Fifty specimens, both sexes, many young, 

 Boruea, Paso Real, and Barranca, April-July. 



On the whole Costa Rican skins of Floricola superba are nearer to true 

 superba than to paUidiceps, though some are intermediate, between the 

 two forms. The Costa Rican bird was named sclateri by Cab. & Heine, 

 but nothing is gained by using this name for a purely intermediate race. 



Clais guimeti (Bourc. & Muls.). Fourteen specimens, both sexes, 

 Boruea, May and June. 



Lophornis adorabilis Salv. Twelve specimens, both sexes, Boruea, 

 May and June. 



FORMICARIID.E. 



Thamnophilus transandeanus Scl. Twenty-five specimens, adults of 

 both sexes and two young males, Boruea, Pozo del Rio Grande, Lagato and 

 Barranca Puntarenas, April-August. 



Thamnophilus bridgesi Scl. One hundred and fifty-one specimens, 

 adults and young of both sexes (the female being of course the so-called 

 Thamnophilus bridgesi Scl. and the male the T. punctatus Cab.; as bridgesi, 

 though based upon the female, is the older name it must stand for the 

 species). Boruea, Paso Real, Pozo del Rio Grande and Lagato, April- 

 August. 



Thamnophilus doliatus (Linn.). Thirty specimens, both sexes, Boruea, 

 Paso Real, Lagato and Barranca Puntarenas, April-August. 



Myrmotherula menetriesi (d'Orb.). Seventeen specimens, adults and 

 young of both sexes, Boruea and Pozo del Rio Grande, April-July. 



Formicivora boucardi Scl. Forty-four specimens, both sexes, Boruea, 

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



Rhamphocaenus rufiventris (Bonap.). Seventeen specimens, both sexes, 

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



Cercomacra tyrannina crepera (Bangs). One hundred and sixteen 

 specimens, young and adult of both sexes, Boruea, Paso Real, Pozo del 

 Rio Grande and Barranca, April-August. 



Gymnopithys bicolor olivascens (Ridgw.). Nineteen specimens, both 

 sexes, Boruea and Pozo del Rio Grande, April-June. 



Myrmelastes exsul occidentalis (Cherrie). Seventy-four specimens, 

 both sexes, young and adult, Boruea, Paso Real, Pozo del Rio Grande and 

 Barranca, April-August. 



