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VIREOSYLVIA. 



843 



Vireosylvia twnituoni. (Calirornla.) 



Tireosylvia s^ainsoni. 



Vireo swainsoni, Baird, Birds N. Am. 1S58, 336 (Pacific coast). 

 Virec bartratnii, Swainson, ¥. B. A. II, 1831, 235 (iu part; spec, from 

 Columbia River?). 



Hdh. United States, from Rocky Mountains to Pacific coast. 



(No. 5,321, % .) Similar to V\ yilva,hnt smaller; colors paler. Bill more 

 (iepressed. Upper mandible 

 almost black. Second quill 

 muuh shorter than 6th. 



( No. S.-l-il, % .) Total length, 

 4.75; wing, 2.71; tail, 2.36; 

 difference between 10th quill 

 and longest, .58 ; exposed por- 

 tion of lat primary, .58, of 2d, 

 1.82, of longest (measured 

 from exposed base of Ist pri- 

 mary), 2.10; length of bill 



from forehead, .56, from nostril, .29, along gape, .65 ; depth of bill, .13 ; tarsus, 

 .70 ; middle toe and claw, .66 ; hind toe and claw, .43. ^ , . 



In the article on Vireo gilvtts, in the Pacific R. R. Report (Birds 

 X. America), I pointed out certain differences between western and 

 eastern Kpecimens, and ai)plied the provisional niinie of V. awainnoni 

 to the former. An examination of many additional si)eciniens since 

 that time has only tended to confirm the impression of the existence 

 of two species, the differences noted, though apparently slight, 

 being constant and readily ajjpreciahle. In the western bird ( V. 

 awuinsuiii) the bill is darker in color, much smaller, and more de- 

 pressed, the depth at the base being less than the width, instead of 

 hi'ing otpial to it. The wing is nioro rounded, the second quill much 

 shorter than the sixth, generally shorter or but little longer than the 

 seventh. In eastern specimens (V. gilva) the second quill is about 

 cfHiivl to the sixth. The second quill is about .JJO of an inch (< r 

 luore) shorter than the longest in siviiinsuni, w hilo in (jilva it is 



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