490 DISTRIBUTION OF THE GENUS V. FLAVOVIRIDIS 



eggs are alike white, rather sparsely but sharply speckled with 

 dark markings. 



Many species of Vireo, unknown to the United States, 

 inhabit Mexico, the West Indies, and Central and South 

 America as far at least as La Plata, some of them having a 

 closely restricted geographical range. The thirteen North 

 American species, in the main, are divided, like the Deudrre- 

 cas, into Eastern and Western sets of species, the former being 

 VV. barbatulus, olivaceus, solitarius, flavifrons, gilvus, philadel- 

 phicus, noveboracensis ; the latter are plumbeus, vicinior, liut- 

 toni, belli, pusillus, atricapillus, to which cassini may be added 



if substantiated as a spe- 

 cies. But gilvus is repre- 

 sented throughout the 

 West by a very slightly 

 different variety, swain- 

 soni ; undoubted exam- 

 ples of solitarius occur on 

 the Pacific side, olivaceus 



FIG 52.-Vireo flavoviridis, natural size. has been f oun d i n U tan> 



and noveboracensis west to the Eocky Mountains, while belli 

 occurs as far east as Illinois. V. atricapillus is known within 

 our limits only from Texas, barbatulus from Florida, and 

 none fewer than four, namely, plumbeus, vicinior, huttoni, and 

 pusillus, seem confined to the Southwest. An addition to 

 these, V. flavoviridis,* has been admitted to our fauna, and 

 may be expected to occur over our southern border. 



In the following pages I take note of all the North American 

 species, giving synonymy and habitat in all cases, with descrip- 

 tive and biographical matter relating to those of the Colorado 

 Basin ; all the species but one being illustrated with details of 

 structure of the wing and bill. The figures I am permitted to 



* Vireo flavoviridis. Yellow-green Vireo. 



Vireosylvia flavoviridis, Cass. Pr. Phila. Acad. 1851, 152, pi. xi (Panama). Scl. PZS. 1856, 

 298 (Mexico). Scl. PZS. 1859, 375 (Oaxaca). S. & S. Ibis, 1859, 12 (Guatemala). ScL 

 Cat. AB. 1861, 44. Lawr. Ann. Lye. N. T. vii. 1861, 323 (New Grenada). J?rf. Kev. AB. 

 1866, 336, fig. Salv. PZS. 1867, 137 (Veragua). Lawr. Ann. Lye. N. T. ix. 1868, 96 

 (Costa Rica). v. Frantz. J. f. O. 18(59, 295 (Costa Eica). Salv. PZS. 1870, 184 (Vera- 

 gua). B. B. <& JR. NAB. i. 1874, 366, tig.Lawr. Bull. Nat. Mus. 1876, 17(Tehuantepec). 



Vireo flavoviridis, Bd. BNA. 1858, 332. Coues, Key, 1872, 120, f. 61. 



Phyllomancs flavoviridis, Cab. J. f. 0. 1861, 93 (Costa Kica). 



Since this article was prepared, and too late for the textual modification 

 required to treat formally of the species, its actual occurrence in Texas 

 has been announced. (Bull. Nutt. Ornith. Club, iii. no. 3, July, 1878, p. 152.) 



