208 BULLETIISr 50, UNITED STATES NATIONAL MUSEUM. 



Vireo hell'd (not of Audubon) Cooper, Proc. Calif. Ac. Sei., 1861, 122 (Fort 

 Mojave, Arizona). 



Frreo6f//tHENsriAw, Reja. Orn. Spec. Wheeler's Surv. for 1873(1874), 105 (Gila R., 

 Arizona); Zool. Exp. W. 100th Merid., 1875, 225 (do.); List Birds Arizona, 

 1875, 157. — CouES, Birds Col. Val., 1878, 526, part (in synonymy). 



Vireo pmiUus (not of Cones, 1866) Coues, Proc. Ac. Nat. Sci. Phila., 1868, 83 

 (Camp Grant, Arizona) ; Check List, 1873, no. 132, part; 2d ed., 1882, no. 184, 

 part; Birds Col. Val., 1878, 531, part (Arizona). — Baird, Review Am. Birds, 

 1866, 360, part (Date Creek, Arizona).— Cooper, Orn. Cal., 1870, 124, part 

 (Arizona). — Baird, Brewer, and Ridgway, Hist. N. Am. Birds, i, 1874, 

 391, part (Arizona). — Henshaw, List Birds Arizona, 1875, 157; Zool. Exp. 

 W. lOOth Merid., 1875, 226 (Camp Grant, Arizona, July; crit.) .—Stephens, 

 Bull. Nutt. Orn. Club, iii, 1878, 93 (Gila R., Arizona, breeding). — Brewster, 

 Bull. Nutt. Orn. Club, vii, 1882, 144 (Tucson, Cienega Station, and Camp 

 Lowell, Arizona; descr. nest; measurements, etc.); Auk, ii, 1885, 197 (Camp 

 Lowell; descr. young). — Belding, Proc. U. S. Nat. Mus., vi, 1883, 343 

 (Guaymas, Sonora). — Gadow, Cat. Birds Brit. Mus., viii, 1883, 302, part 

 (Arizona).— Bailey (Florence M.), Handb. Birds W. U. S., 1902, 400, part. 



Vlireo] pusillus Coues, Key N. Am. Birds, 2d ed., 1884, 335, part. — RiixiWAY, 

 Man. N. Am. Birds, 2d ed., 1896, 478, part. 



Vireo hellii pusillus Ridgway, Proc. U. S. Nat. Mus., viii, Sept. 2, 1885, 354, 

 part. — American Ornithologists' Union, Check List, 1886, no. 633f/, part. — 

 Oberholser, Proc. Biol. Soc. Wash., xvi, 1903, 17, 18, in text (part). 



Viireul hellii pimllv.'i Ridgway, Man. N. Am. Birds, 1887, 478, part.— (?) Morcom, 

 Bull. Ridgway Orn. Club, no. 2, 1887, 51, part (Fort Yuma, Arizona, 

 breeding). 



Vireo belli pusillus Scott, Auk, v, 1883, 33 (Santa Catalina Mts., etc., s. Arizona, 

 breeding up to 4,000 ft.). 



VIREO BELLI! PUSILLUS (Coues). 

 LEAST VIREO. 



Similar to V. h. arizonse^ ))ut .still graj^er above and whiter beneath; 

 the upper part^? between olive-gra}" and mouse gray w ithout distinct 

 tinge of greenish olive except on rump and upper tail-coverts (and there 

 obvious only in fresh plumage); under parts nearly pure white, includ- 

 ing under tail-coverts, the sides and flanks washed with pale olive-gray 

 or grayish olive, but with only the merest trace of yellow tinge; wing 

 and tail averaging longer. Young with upper parts decidedly paler 

 and gra3^er, and under parts of bod}-, with under tail-coverts, pure 

 white throughout. 



Adult 7nale.— Length (skins), 104-113 (109.7); wing, 52.5-59 (55.4); 

 tail, 47-54 (50.8); exposed culmen, 9-10 (9.4); tarsus, 18-19.5 (19); 

 middle toe, 9.5-10 (9.9). « 



Adult female. — Length (skins), 105-114 (109.9); wing, 53.5-56 



a Eighteen specimens. 



