HOST RELATIONS OF PARASITIC COWBIRDS 215 



peruviensis), near Lima, Peru. While there are earlier records from 

 Peru, the number of Dr. Koepcke's instances make it clear that in 

 that country, as in Argentina and Brazil, this sparrow is a very 

 frequent, if not the most frequent, host. 



White and Gray Warbling Finch 



Poospiza melanoleuca (Lafresnaye and d'Orbigny) 



Commonly parasitized by the shiny cowbird in the province of 

 Tucuman, this finch also has been noted as a cowbird host in Salta, 

 by Hoy (ms., 1961), who listed it as one of those fosterers which often 

 are motivated to desert their nests by the intrusions of the parasite. 



Many -colored Ground Sparrow 



Saltatricula multicolor (Burmeister) 



This finch, previously known as a cowbird victim from a single 

 record in Tucuman province, Argentina, has been found recent!}^ by 

 Hoy (ms., 1961) to be parasitized not infrequently farther nortli in 

 the province of Salta. Hoy considered this bird as one of those hosts 

 which are prone to desert their nests when they are parasitized, but 

 he gave no actual estimates of the number of cases he observed. 



La Plata Ground Finch 



Embernagra platensis (Gmelin) 



Hoy (ms., 1961) found that this bird was victimized not infrequently 

 near Salta, northwestern Argentina. It was recorded previousl}^ as a 

 host species in Paraguay and in Buenos Aires province. According to 

 Hoy, it was caused readily to desert its nest because of the attentions 

 of the parasite. The Salta and Paraguayan records involve the race 

 olivascens and the Buenos Aires record, the nominate. All the cases 

 involve the nominate race of the parasite. 



630590 — 63 15 



