158 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



V\_ireo'] g[ilvus} swainsomf Coues, Key N. Am. Birds, 2d ed., 1884, 333. 



V\_lreo] gilvus swainsoni Ridgway, Man. N. Am. Birds, 1887, 472. 



[Vireosyhia gilva'] fi. swainsoni Ridgway, Orn. 40th Parallel, 1877, 448 (localities 

 in Nevada and Utah; habits, etc. ). 



Vireosylvia gilva, ft. sivainsoni Ridgway, Field and Forest, ii. May, 1877, 197 

 (Colorado); Bull. Nutt. Orn. Club, iii, 1878, 66 (central California); Proc. 

 U. S. Nat. Mus., i, 1879, 469 (do.). 



Vireosylvia gilva sivainsoni Ridgway, Bull. Essex Inst., vii, Jan., 1875, 18, 19 

 (Carson and West Humboldt Mts., Nevada); Nora. N. Am. Birds, 1881, no. 

 139rf. — Belding, Proc. U. S. Nat. Mus., v, 1883,545 (Miraflores, Lower Cali- 

 fornia). 



[^]'^^irt'o gilvus sivainsoni] b. swainsoni Coue^, Birds Col. Val., 1878, 501. 



VIREOSYLVA GILVA BREWSTERI, new subspecies." 

 CHIHUAHUAN WARBLING VIREO. 



Similar to T^ (j. suxdnsoni^ l)ut decidedly larger and with the sides 

 and Hanks much less strongly washed with greenish olive. 



Adult male. —Length, (skins), 115-125 (120.8); wing, 71-75 (73); tail, 

 49-55 (52.5); exposed culmen, 10.5-12 (11.2); depth of bill at nostrils, 

 4; tarsus, 17-18 (17.5); middle toe. 9.,5-ll (10.2).'^ 



Adiilt female.— luQwgth (skins). 117-120(118.7); wing, 71-72 (71.7); 

 tail. 49-51 (50.3); exposed culmen, 10-11.5 (10.8); depth of bill at 

 nostrils, 4; tarsus, 17-18 (17.5); middle toe, 10-10.5 (10.2).'' 



Mountains of Chihuahua (Bravo; Mina Abundancia), northwestern 

 Mexico. 



VIREOSYLVA AMAURONOTA AMAURONOTA ( Salvin and Godman). 



ORIZABA VIREO. 



Adults {se.t'es alike). — Pileinn plain sooty grayish brown (grayish 

 sepia or dark hair brown); hindneck, back, scapulars, rump, upper 

 tail-coverts, and lesser wing-coverts plain olive, darker, more decidedly, 

 and slightly lu'ownish, olive on back, lighter and more greenish olive 

 on rump and upper tail-coverts; wings and tail dusky gravish brown 

 (dark hair brown) with pale olive edgings; a superciliary stripe of 

 dull white, passing into pale brownish gra}" j^osteriorly (over auricular 

 region); a narrow dusky loral streak, most distinct at anterior angle 

 of eye; auricular region olive-brownish, darker on upper portion, 

 especial!}" near posterior angle of eye, paler on lower portion, where 

 passing into pale brownish gray on malar region, the suborbital region 

 still paler, or dull whitish; under parts dull whitish, faintly tinged 

 with pale 3^ellow (except on chin and throat), the sides and flanks 

 tinged with light olive; under tail-coverts, under wing-coverts, and 

 axillars very pale sulphur or primrose yellow; inner webs of remiges 



"Type, no. 21811, collection of William Brewster; adult male, Bravo, Chihuahua, 

 July 24, 1888; M. Abbott Frazar. 

 ''Six specimens, 

 c Three specimens. 



