Cassia's Vireo 435 



Genus LANIVIREO. 



Medium-sized V^ireos resembling Vireosylva, but with a relatively- 

 shorter and stouter bill, the depth of which at the base is far more 

 than half the distance from the nostrils to the tip ; wings as in Vireo- 

 sylva, but with two conspicuous wing-bars. 



This genus, containing three species, ranges over temperate North 

 America, south to Colombia (for key, see p. 431). 



Cassin s Vireo. Lanivireo solitarius cassini. 



A.O.U. Checklist no 629a— Colorado Records— Ridgway 79, p. 228 ; 

 H.G.Smith 96,p.76; 08,p.l89; Cooke 97, pp.112, 1G8; Gary 09, p.l83. 



Description. — Male — Top and sides of the head dark ashy-grey, 

 passing into olive-green on the back and rump ; a white ring round 

 the eye, continued forward over the lores ; wings and tail dusky, edged 

 with olive-yellow ; the innermost secondaries with almost white, and 

 the middle and greater coverts with pale yellow tips, forming a 

 double wing-bar ; below white, becoming pale olive-yellow on the 

 flanks ; inner webs of wing- and tail-feathers edged with white ; iris 

 brown, bill greyish with a darker tip, legs dusky. Length 4-90 ; wing 

 2-90 ; tail 2-15 ; cuhnen .42 ; tarsus -70. 



The sexes are practically alike ; the yoimg birds have the orbital 

 ring and the under-parts tinged with brownish-buff. 



Distribution. — Breeding in western North America from British 

 Colvunbia to southern California, eastwards on migration through 

 Arizona and New Mexico, and south through Mexico to Oaxaca. 



Cassin's Vireo is of accidental occurrence in Colorado. It was 

 represented in the Maxwell collection (Ridgway), and has since been 

 obtained on three occasions near Denver by H. G. Smith — a male on 

 the Platte River, September 16th, 1884, another example at Cresswell 

 in Jefferson co. on September 9th, 1887, and a female on Coal Creek 

 on May 13th, 1888 ; it was also taken by W. F. Doertenbach near 

 Pueblo September 6th, 1897 (Cooke), and Gary has recently obtained an 

 example on September 4th on the Escalante hills in westernRoutt co. 



Plumbeous Vireo. Lanivireo solitarius plumbeus. 



A.O.U. Checklist no 629b— Colorado Records— Allen 72, pp. 149, 

 156 ; Aiken 72, p. 198 ; Trippe 74, p. 100 ; Henshaw 75, p. 224 ; Minot 

 80, p. 229 ; Tresz 81, p. 289 ; Allen & Brewster 83, p. 160 ; Drew 85, 

 p. 15 ; Beckham 85, p. 141 ; Kellogg 90, p. 90 ; Lowe 94, p. 269 ; Cooke 

 97, pp. 19, 112, 218 ; Henderson 03, p. 236 ; 09, p. 239. 



Description. — Male — General colour above slaty-grey, with a very 

 faint tinge of olive on the rump ; orbital ring and supra-loral stripe 

 white, slightly separated by a black spot in front of the eye ; wings 

 and tail dusky black edged with white, especially the outer tail-feathers 



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