VIREO. 193 
which has been sought to be maintained, though he separates the references to the two 
races under their respective heads. So far as Mexico is concerned, there can be no 
doubt that the true V. gilvus occurs there, as the specimen obtained by Galeotti at 
San Pedro (a male, shot in December 1844, and now in the Strickland collection at 
Cambridge §) is precisely like one, also a male, shot by Prof. Baird at Carlisle, Penn- 
sylvania, in May 1847. The western race also occurs in Mexico; for not only is it 
found on the immediate frontier, but Mr. Lawrence has recognized it in specimens sent 
from the isthmus of Tehuantepec by Prof. Sumichrast®. Vireo gilvus, however, seems 
to be nowhere common in Mexico in either of its forms; nor does it pass southwards 
into Guatemala or any other of the Central-American States. 
In North America it is known as the Warbling Greenlet, from the fine quality of its 
song in the breeding-season ; and it may be heard from May to July throughout the day 
in places frequented by it. It is a very familiar species in the Eastern States, and may 
be seen and heard even in the large towns wherever clumps of large trees grow. Both 
Brewer‘ and Dr. Coues !° give full accounts of its habits and of its nest and eggs. The 
nest, whilst resembling those of its congeners in the nature of its materials and in its 
pendent position, is, as a rule, more carefully built. It is suspended at a height of 
thirty to fifty feet from the ground, and sometimes even in the top of a large elm. 
The eggs are, like those of other Vireos, crystal-white with a few scattered spots of 
dark brown and others of a lighter shade ’. 
7. Vireo amauronotus, sp. n. 
Vireosylvia gilva, var. josephe, Ridgw. in Baird, Brew. & Ridgw. N. Am. B. i. p. 360, note’. 
V. gilvo similis, sed capite summo haud cinereo, dorso brunneo fere concolori distinguendus, a V. josephe capite 
dorso fere concolori nec nigricanti-brunneo et abdomine fere albicante quoque differt. (Descr. exempl. ex 
Orizaba, Mexico. Mus. Smiths. no. 54262.) 
Hab. Mexico, Orizaba (Sumichrast 1). 
It is not without considerable hesitation that we describe this bird, which presents 
characters intermediate between V. gilvus on the one hand and / josephe on the other, 
but which cannot well be placed with either. Mr. Ridgway in referring to the single 
specimen described above, and which he has kindly sent to us for examination, looks 
upon it as justifying the treatment of V. gilvus and V. josephe as imperfectly segregated 
races of the same form!. This may prove to be the case; but when we consider that 
V. gilvus is a migratory species, reaching Southern Mexico at furthest in winter, and 
the obvious differences that it possesses from V. josephe, for any thing we know to the 
contrary a resident species in Costa Rica, Colombia, and Ecuador, and that the two 
birds have not yet been shown to come within 1000 miles of one another, this seems to 
be a rather sweeping generalization. We therefore incline to what appears to be a more 
probable solution of the difficulty by considering the Orizaba bird as belonging to 
BIOL. CENTR.-AMER., Aves, Vol. I., December 1881. 25 
