NO. II DATA ON THE PARASITIC COWBIRDS — FRIEDMANN 7 



ington, by Rogers (1964), who reported two nests, each with two eggs 

 of the parasite. The Washington records refer to the race /. o. mon- 

 tanus. This junco is probably becoming increasingly used as a host 

 as the cowbird expands its range in the Northwest. 



Olive sparrow 



Arremonops rufivirgata (Lawrence) 



To the few records of this sparrow as a host of the dwarf race of 

 the brown-headed cowbird in southern Texas may be added one more, 

 found at Beeville and reported by Webster (1964). The nest also 

 contained eggs of the bronzed cowbird (see p. 10). 



Song sparrow 



Melospiza melodia (Wilson) 



Crossin (1965) has recorded the race fallax of the song sparrow 

 as a host of the brown-headed cowbird near Tucson, Arizona. How- 

 ever, if the ranges of the races of the host are correctly given in the 

 last edition of the A.U.O. checklist, we must refer this record to the 

 race saltonis and not to fallax, just as the Wyoming record of "fallax" 

 listed in my 1963 account (p. 169) must refer to juddi. 



Bronzed Cowbird 



Tangavius aeneus 



The following host data involves five kinds of birds not previously 

 reported as cowbird victims. The host catalog of the bronzed cowbird 

 now includes 56 species, or 69 species and subspecies, of birds. 



Happy wren 



Thryothorus felix Sclater 



J. Stuart Rowley (in litt.) found on July 3, 1965, about 4 miles 

 north of Putla, Oazaca, Mexico, 3,200 feet elevation, a nest of this 

 wren containing three eggs of its own and one of the bronzed cowbird, 

 all nearly ready to hatch. Judging by the locality, this record must 

 refer to the nominate race of the wren and to the southwestern race 

 assimilis of the cowbird. This wren (subspecies pallidas) had been 

 recorded once as a host of the bronzed cowbird (race milleri) ; the 

 present record is therefore the first for Thryothorus f. felix as a host 

 and for Tangavius a. assimilis as a parasite of this wren. 



