VIEEO. 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, yzx.josephce, Ridgw. in Baird, Brew. & Ridgw. N. Am. B. i. p. 360, note'. 



V. qilvo similis, sed capite summo haud cinereo, dorso brunneo fere concolori distinguendus, a V. josephm capita 

 dorso fere concolori nee nigrifanti-brunneo et abdomine fere albicante quoque differt. (Descr. exempl. ex 

 Orizaba, Mexico. Mus. Smiths, no. 54262.) 



Hah. Mexico, Orizaba {Sumichrast ^). 



It is not without considerable hesitation that we describe this bird, which presents 

 characters intermediate between V. gilvus on the one hand and V. joseph(B on the other, 

 but which cannot well be placed with either. Mr. Eidgway 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 F. gilvus and V.josephce 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.josej)hce, for any thing we know to the 

 contrary a resident species in Costa Eica, Colombia, and Ecuador, and that the two 

 birds have not yet been shown to come within IQOO 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. CENTK.-AMBB., Aves, Vol. I., December 188L 25 



