142 Brewster on a Collecdioti of Arizona Birds . 
45. Vireo gilvus ( Vieill .) Bonap. Warbling Vireo. — 
Found among all the well-timbered mountains visited, but no- 
where as a common bird. 
Of the several characters which are said to distinguish var. stvaihsoni 
from gilvus proper. I can appreciate only the slightly different shape of 
the bill. The relative length of the wing-quills is an absolutely inconstant 
characteristic with birds from any of the localities represented in my series, 
while 1 do not find that western specimens — at least California and Ari- 
zona ones — are either paler or grayer than many we get in the Atlantic 
States. Indeed, nearly the darkest one in my whole suite comes from 
Arizona. In view of these facts I cannot regard swainsoni as worthy of 
varietal recognition. 
46. Vireo solitarius cassini ( Xantus ) Ridgw. Cassin’s 
Vireo. — Common among the foot-hills of the mountains. 
Mr. Henshaw has so satisfactorily defined* the characters which respect- 
ively distinguish the Cassin’s and Plumbeous Vireos from solitarius 
proper, as well as from each other, that there is no room for any further 
remarks on what, previous to his examination, was a very tangled problem. 
The specimens mentioned below are all unmistakably referable to cassini , 
although one or two of them present slight approaches to plumbeus. It 
is a singular fact that Mr. Stephens did not meet with any typical exam- 
ples of the latter race. 
209, $ ad., Cienega Station, April 16. Length, 5.40; extent, 8.70. 
“Iris brown ; bill dark horn-color above, lighter below ; legs dark bluish.” 
214, 9 ac C same locality and date. Length, 5.60; extent. 9.10; wing, 
3; tail, 2.44. 
236, $ ad.. Tucson, April 19. Length, 5.60; extent. 8.70; wing, 2.89; 
tail, 2.41. 
316, $ ad.. Tucson, May 2. Length, 5.30; extent. 8.50; wing. 2.71; 
tail, 2.26. 
346, $ ad., Tucson May 7. Length, 5.30; extent, 9; wing, 2.76; tail, 
2.23. “Very fat. Would not have laid for a long time,” 
354, $ ad., Santa Rita Mountains, May 11. Length, 5.10; extent, 8.80; 
wing, 2.82; tail, 2.27. “Iris brown; bill nearly black, bluish at base 
below; legs lead-color.” 
47. Vireo huttoni stephensi var. nov. Stephens’ Vireo. 
Ch. Sp. — $ $ Similis V. huttoni sed rostro robustiori, alis longioribus. 
Supra griseo-cinereus, infra fusco-albidus. Uropygio et marginibus cau- 
dse sordide virenti-olivaceis. Alis albo bifasciatis ; remigibus albo-mar- 
ginatis. Loris et orbe circum-oculari (macula fusco-brunnea in palpebra 
superiori excepta), cinereo-albis. 
Adult $ (No. 5,728, author’s collection — collector’s No., 41 — Chiricahua 
Mountains, Arizona, March 14, 1881. F. Stephens). Bill stout; wings 
from .30 to .40 inches longer than tail. Above grayish-ash ; the crown. 
* U. S. Geol. Surveys W. 100 Merid., 1879, pp. 291-293. 
