156 



Nelson New Birds from Southern Mexico. 



under tail coverts dull white with a strong wash of buffy along each side, 

 and a much lighter suffusion of same over middle of white underparts; 

 tail below slate gray with narrow white tips to feathers. 



Measurements of Vireolanius melitophrys and V. m. goldmani. 



Remarks. The family to which Vireolanius belongs is distinguished 

 by the identity of the sexes in color, and for this reason I have felt suf 

 ficiently confident that the well marked differences in color between the 

 female specimens, from the mountains south of the Valley of Mexico, 

 and our typical male from near Jalapa, Vera Cruz cannot well be con 

 sidered due to sex. This conclusion is supported by the well marked 

 differences of size the three specimens of goldmani (including an imma 

 ture male) are all larger than the typical male of melitophrys, and have 

 shorter bills. 



In the "Biologia" (Vol. I, p. 209), the authors describe a female of F. 

 melitophrys from the Volcan de Fuego, Guatemala, as different from the 

 male from the same locality. The distinguishing characters of the 

 female in this description so closely parallel the characters, in which the 

 immature male of V. m. goldmani differs from the females, that it ap 

 pears a fair inference that the Volcan de Fuego female is an immature 

 bird, and the differences due to immaturity and not to sex. 



Geothlypis chapalensis, sp nov. 

 Chapala Yellow-throat. 



Type. No. 186,409, $ ad., U. S. Nat. Mus., Biological Survey Coll. 

 From Ocotlan, Jalisco, Mexico. Collected June 26, 1903, by E. W. 

 Nelson and B. A. Goldman. 



Distribution. Fresh-water marshes along lower Lerma River and 

 eastern border of Lake Chapala (from near La Barca to Ocotlan), Jalisco, 

 Mexico. 



