8 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I49 



Mockingbird 



Mimus polyglottos (Linnaeus) 



To the one previous report of the mockingbird (M. p. leiicopterus) 

 as a victim of the nominate race of the bronzed cowbird, Webster 

 (1963, p. 471) added a nest, found at San Benito, Texas, containing 

 the surprisingly large combination of eight eggs of the parasite and 

 two of the host. Since mockingbirds are seldom imposed upon by 

 either the bronzed or the brown-headed cowbird but are frequently 

 parasitized in South America by the shiny cowbird, each additional 

 report is an opportunity for critical study. 



Rufous-backed robin 



Turdus rufo-palliatus Lafresnaye 



Previously unrecorded as a host of the bronzed cowbird, this robin 

 has been found parasitized in southern Mexico. J. Stuart Rowley 

 (in litt.) reported that on June 18, 1965, at Oaxaca City, Oaxaca, 

 5,000 feet elevation, he found, about 10 feet up in a small tree, a nest 

 of this species containing three robin and two bronzed cowbird eggs. 

 The record involves the nominate race of the host and the race 

 assimilis of the parasite. 



Russet nightingale-thrush 



Catharus occidentalis Sclater 



J. Stuart Rowley (in litt.) found a nest of this thrush containing 

 two eggs of its own and one of the bronzed cowbird at Rio Molino, 

 near San Miguel Suchixepec, in the Sierra Madre del Sur of southern 

 Oaxaca, Mexico, 7,300 feet elevation, on April 29, 1962. This is the 

 first report of this thrush as a victim of the bronzed cowbird (7\ a. 

 assimilis). The record was published by Rowley and Orr (1964, 

 p. 311). 



Orange-billed nightingale-thrush 



Catharus aitrantiirostris (Hartlaub) 



A third record of this thrush as a host of the bronzed cowbird is 

 reported: a nest with one egg of the host and two of the bronzed 

 cowbird was collected 5 miles east of Cuernavaca, Morelos, May 29, 

 1962, by J. Stuart Rowley (see Friedmann, 1963, p. 180). 



