FAMILY VIREONIDAE 



217 



men in BMNH no. 1925.12.22.321 ) , and at Almirante, Bocas del Toro, 

 where it is one of the commonest migrants caught in the mist nets oper- 

 ated by the Gorgas Memorial Laboratory. The highest elevation at 

 which it has been collected is 1590 m, at Lerida, Chiriqui (Blake, 

 Fieldiana: Zool., vol. 36, no. 5, 1958, p. 553). The Smithsonian has 

 specimens from Jaque, Darien; Chico, and La Jagua in the Province of 

 Panama; from Alajuela and Fort Clayton in the Canal Zone; and 

 from Almirante, Bocas del Toro. 



VIREO OLIVACEUS CANIVIRIDIS Burleigh 



Vireo olivaceus caniviridis Burleigh, 1960, Auk, vol. 77, p. 214. (Moscow, Latah 

 County, Idaho.) 



Characters. — Olive-green of upper surface paler and with a gray 

 wash; undersurface clearer white, with little or no yellowish olive on 

 sides and flanks. 



Measurements. — Males (10 from Idaho, taken in May and June), 

 wing 80.5-83.2 (81.8), tail 56.1-60.2 (58.0), oilmen from base 14.1- 

 16.4 (15.5), tarsus 17.1-20.0 (18.5) mm. 



Females (3 from Idaho, taken in July), wing 76.0-80.5 (78.3), tail 

 56.2-58.0 (57.2), culmen from base 14.7-14.8 (14.7), tarsus 18.5-19.4 

 (18.9) mm. 



Migrant from the north. Burleigh's recognition of a separate race 

 for Red-eyed Vireos from the arid northwestern United States, in 

 Idaho, Washington, and Oregon, is not usually admitted (Blake, Check- 

 list Birds World, 14, 1968, p. 122). Alan R. Phillips, however, con- 

 siders this subspecies to be valid and has identified a male from the La 

 Jagua Hunt Club, Chico, Province of Panama, taken March 30, 1955, a 

 female from the mouth of the Rio Imamado, Rio Jaque, Darien, taken 

 March 30, 1947, and a female from Pacora, Province of Panama, taken 

 October 14, 1958 as caniviridis. 



VIREO FLAVOVIRIDIS FLAVOVIRIDIS (Cassin): Yellow-green Vireo 

 Vireo Verdiamarillo Julian Chivi 



Vireosylvia flavoviridis Cassin, 1851, Proc. Acad. Nat. Sci. Philadelphia, 5, p. 152. 



(Panama and San Juan de Nicaragua; restricted to San Juan de Nicaragua by 



Zimmer, 1941, Amer. Mus. Novit, no. 1127, p. 2.) 

 Vireo insulanus Bangs, 1902, Proc. New England Zool. Club, 3, p. 73. (Isla del 



Rey, Bay of Panama.) 



Rather small; crown medium gray; light gray superciliary; rest of 

 upper surface bright olive-green; undersurface white, with flanks and 

 undertail coverts yellow. 



