INSESSORES. 



153 



Frequently noticed by Dr. Pickering as occurring in Oregon. It is 

 also one of the most common fly-catchers of California, and is a rare 

 straggler iu the States on the Atlantic, having been obtained by Mr. 

 Edward Harris, one of our most eminent ornithologists, in New Jersey. 



2. Ttrannus borealis, Swainson. 



Tifmnnus borealis, SwAiNS. Faun. Bor. Am. Birds, p. 141 (1831). 

 Muscicojja Cooperi, Nutt. Man. Orn. I, p. 282 (1832). 



Faun. Bor. Am. Birds, Plate XXXV; Aud. B. of Am. Plate 

 CLXXIV ; oct. ed. I, Plate LVIII. 



Specimens in the collection of the Expedition were obtained in 

 Oregon. This, though more especially a Western species, has fre- 

 quently been captured in the Atlantic States, and in fact may be 

 considered as becoming more common than formerly. It is a true 

 Tyrannus, though little is known of its manners or history. 



The name given by Swainson to this bird as above, is undoubtedly 

 entitled to be adopted on account of priority. 



6. Genus TYRANNULA, SvMins. Cab. Cy. II, p. 225 (1837). 



1. Ttrannula Saya [Bonap.). — Say's Fly-catcher. 

 Muscicapa Saya, BoNAP. Am. Orn. II, p. 20 (1825). 



Bonap. Am. Orn. II, Plate III ; Aud. B. of Am. Plate CCCLIX, 

 fig. 4, 5 ; Oct. ed. I, Plate LIX. 



Mentioned by Dr. Pickering as having been observed in Oregon, and 

 as being of common occurrence at several localities in that Territory. 

 This appears to be one of the most abundant fly-catchers of Western 

 North America, being brought by nearly all collectors in California 

 and Oregon. 



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