50 U.S. NATIONAL MUSEUM BULLETIN 2 33 



cases or other data supporting its inclusion are on record but, judging 

 from the geographical range of the western Idngbird, the race of cow- 

 bird involved must be artemisiae. 



Cassin's Kingbird 



Tyrannus vociferans Swainson 



I know of only a single instance of this species being used as a host 

 by the brown-headed cowbird. A nest with 3 eggs of Cassin's king- 

 bird and 2 of the dwarf race of the brown-headed cowbird was found in 

 the Santa Rita Mountains, Arizona, June 29, 1884; it is now in the 

 C. E. Doe collection in the Florida State Museum, Gainesville. 



Scissor-tailed Flycatcher 



Muscivora forficata (Gmelin) 



The scissor-tailed flycatcher is a rarely imposed upon victim of the 

 eastern and the dwarf races of the brown-headed cowbird. Fitch 

 (1950, p. 158) found a nest in Brazos County, Texas, with 3 eggs of 

 the scissor-tail and 4 of the dwarf race of the parasite. Before this, 

 all that was known of the species as a molotlu"ine host was the bare 

 fact that Simmons (1925, p. 172) listed it as one of the birds para- 

 sitized in the region around Austin, Texas. In the files of the U.S. 

 Fish and Wildlife Service are two mipublished records, both from 

 Decatm', Texas, reported by John A. Donald in 1890 and 1892. 

 Recently Pulich (1961, p. 52) recorded that on June 29, 1959, a scissor- 

 tailed flycatcher was observed caring for a fledged cowbird in Tarrant 

 County, Texas. This is the sole record for the nominate race of the 

 cowbird using the species as a host. It would seem that by now a large 

 enough number of nests of this flycatcher would have been found to 

 give some idea of the frequency with which it is victimized. Since 

 no other instances have been reported, it becomes evident that the 

 species is seldom bothered by the cowbird. This is diSicult to under- 

 stand, as the South American counterpart, the fork-tailed flycatcher, 

 Muscivora tyrannus, is a frequent host of the shiny cowbird, M. 

 bonariensis, in Argentina. 



Great Crested Flycatcher 



Myiarchus crinitus (Linnaeus) 



Like so many hole-nesting species, the great crested flycatcher 

 is relatively unmolested by the brown-headed cowbird. Five records 

 have come to my notice, two from Maryland, and one each from 

 Massachusetts, Michigan, and Illinois. The data are as follows: the 

 late J. Hooper Bowles informed me that once he had found a para- 

 sitized nest of this flycatcher in Massachusetts; Blocker (1936) listed 

 it as a victim of the cowbird near Amboy, lUlnois; E. J. Court (in litt.) 



