23. TiREo. 297 



Vireosylvia gilra, rar. swainsoni, Cooper, Orn. Californ. i. p. IIG 

 (1870); Baird, Brew., S,- Bidyie. X. Am. B. i. p. 371; Scl. |- Salv. 

 Nomencl. p. 12 ; Later. Bull. U.S. Nat. Mus. i. p. 17. 



Vireo gilvus swainsoni, Coues, Birds Color ad. Vail. p. 501. 



Upper parts pale olive-grey ; crown of head leadea grey, withoiit 

 any olive tinge ; superciliary line and lores whitish, with no greyish 

 spot in front of the ej^e ; cheeks and ear-covcrts hrownish white ; 

 all the underparts dull white, slightly tinged with yellowish on the 

 chest and under tail-coverts ; flanks tinged with olive-yellow ; edge 

 of wing, under wing-coverts, and inner margin of quills white ; bill 

 horn-colour, with the mandible paler ; feet lead-colour. Culmen 

 0-45-0-5.5 inch, wing 2-8, tail 2, tarsus 0-G8. 



Hah. Temperate North America and Mexico. 



Ohs. A specimen from the western side of the Rockj- Mountains 

 shows no difference in colour and size from the other specimens. 

 The western specimens are supposed to be a little smaller and greyer 

 above, the underparts being slightl)- whiter (var. swainsom) ; but the 

 supposed differences are not sufficient to distinguish between an 

 Eastern and Western race of V. gilvus. 



N. A. B. Commission. 



B. R. Ross, Esq. [P.]. 



of Rocky J. K. Lord, Esq. [P.J. 



Prof. Steere [P.]. 



8. Vireo josephse. 



Vireo josephfe, Sclat. P. Z. S. 1859, p. 137, pi. 154 ; Salv. ^- Godm. 



Biol. Centr.-Amer., Aves, p. 194. 

 Vireosylvia josephfe, Baird, Rev. Am. B. p. 344 (1865) ; Laivr. Ann. 



Lye. N. Y. ix. p. 96 ; v. Frantzius, J. f. O. 1869, p. 295 ; Taeza- 



mncski, P. Z. S. 1874, p. 509 ; Scl. S,- Salv. Komencl. p. 12 ; iid. 



P. Z. S. 1879, p. 495; Salv. Cat. Strickl. Coll. p. 112. 

 Vireosylvia gilva, vai\ josephse, Baird, Bi'eio., Sf Ilidyic. N. Am. B. 



i. p. 360. 



Upper parts brownish olive, the brown colour becoming gradually 

 more predominant on the hind neck, whilst the entire crown of the 

 head is dark brown without an^^ olive tinge ; superciliarj- line, 

 chin, and throat white; car-coverts and part of the checks whitish 

 brown ; all the rest of the underparts, including the inner margin of 

 the quills, uniform light sulphur-yellow ; " bill horn-brown, paler 

 towards the base of the mandible ; iris dark hazel " (Sclater). 

 Culmen 0-51 inch, wing 2-4 (2-6), tail 1-7 (2-0.5), tarsus 0-65. 



The figures in brackets are the measurements of the male tj'pe 

 specimen as given by Mr. Sclater. The female, according to Sclater, 

 is paler on the underi^arts, more inclining to whitish. A specimen 

 in the British-Museum collection, one of the typical ones, has 

 the crown of the head only a little darker brown than the mantle ; 

 the wings and tail are externally washed with pale olive-grey 

 instead of olive ; all the underparts are white, onlj- very slightly 

 tinged with yellow. "Wing 2-3. This is undoubtedly the female of 

 U. josephev, and at the same time is strikinglv like T'. ammironotus. 



