184 U.S. NATIONAL MUSEUM BULLETIN 233 



refer to the host race I.y. alticola and to the parasite race T.a. aeneus; 

 the Nayarit, Sinaloa, and Sonora ones, to I.p. microstictus and to 

 T,a. milleri; the Morelos one, to I.p. pustulatus and T. a. aeneus. 



Bullock's Oriole 



Icterus bullockii (Swainson) 



Bullock's oriole is a frequent victim of the bronzed cowbird, but so 

 few observations have been made in recent years that my 1929 (p. 331) 

 account needs little change to bring it up to date. 



Merrill (1877, pp. 85-87) intimated that Bullock's oriole occasionally 

 tried to get rid of the parasitic eggs; twice he found broken shells of 

 bronzed cowbird eggs on the ground below occupied nests. Also he 

 once found a female cowbird hanging, mth a stout fiber around its 

 neck, from a Bullock's oriole nest. The nest contained one young of 

 the parasite, which caused Merrill to deduce that "its parent after 

 depositing the egg was entangled in the thread on hurriedly leaving 

 the nest, and there died. It had been dead about two weeks." Att- 

 water (1892, p. 237) found a parasitized nest near San Antonio. 

 F. F. Nye, Jr. (in litt.), found another near Pharr, Texas. The race 

 of the oriole involved in all these records is the nominate; the parasite 

 is also represented by its nominate form. 



One uncertain record of this bird as a victim of the bronzed cowbird 

 has been noted. In the Nueces Kiver Flats, Texas, W. B. Savary 

 (1936, p. 62) examined a nest of the "Baltimore oriole" containing an 

 egg of the bronzed cowbird. The record, however, is open to question 

 as the locality is south of the aclmowledged breeding range of that 

 oriole. Although Savary definitely states that the bird breeds there, 

 it seems likely that his record involved Bullock's oriole, not the one 

 to which he attributed it. 



Hepatic Tanager 



Piranga flava (Vieillot) 



A record, recently published by Bent (1958, p. 495), adds this 

 tanager to the list of victims of the bronzed cowbird. Bent writes 

 that Frank C. Willard informed him that he once found an egg of the 

 western race of the parasite in a nest of P./. hepatica. Although no 

 exact locahty is given, the race of the parasite must be milleri. Still 

 more recently, J. Stuart Rowley (mss.) found this tanager to be para- 

 sitized near Cuernavaca, Morelos; a nest with 3 eggs of the tanager 

 and 2 of the parasite was found June 15, 1958. In this case the 

 parasite was of the nominate race. 



Summer Tanager 



Piranga rubra (Linnaeus) 



There are two records of this tanager as a victim of the bronzed 

 cowbird, both records involving the western race, P.r. cooperi, of the 



