Description of New Birds from Mexico. 61 



slight traces of a blackish border; the under surface is olive-brown, of a 

 much clearer or greener shade. It is decidedly smaller with much smaller 

 bill. 



Contrasted with typical rubicoides, this form is very different, but our 

 series of specimens from various localities in Vera Cruz, and thence 

 through the Isthmus of Tehuantepec and up the west coast to Jalisco, 

 show that it is merely a geographical race of that species. 



Amphispiza bilineata grisea subsp. nov. Mexican Black -throated 



Sparrow. 



Type No. 136006, U. S. Nat. Mus., Biological Survey Coll. ad. cf, Tula, 

 Hidalgo, Mexico, March 9, 1893. Collected by E. W. Nelson. 



Distribution. Southern part of Mexican tableland from northern San 

 Luis Potosi to northern end of Valley of Mexico. 



Differs from typical A. bilineata in larger size, proportionately shorter 

 bill and tarsus, darker and grayer dorsal surface, and smaller white areas 

 on ends of tail feathers. 



Averages of typical Amphispiza bilineata (southern Texas and north 

 eastern Mexico) : 



Ad. <j" (5 specimens) : wing 64.4 ; tail 57.8 ; culmen 10.6 ; tarsus 18.9. 

 " 9 (2 " ): " 62; " 57; " 10.7; " 19. 



Averages of A. bilineata grisea (San Luis Potosi and Hidalgo) : 



Ad. (^ (8 specimens) : wing 69.1 ; tail 63.4 ; culmen 10.5 ; tarsus 19. 

 "$ (3 " ): " 66.6; " 60.6; " 10.8; " 19. 



The present race inhabits a region in which the species was previously 

 unknown, thus leaving it without definite synonymy. The following 

 citations, however, might be doubtfully referred to it: 



Poospiza bilineata (nee Sclater, 1850) Scl., Cat. Am. Birds, 110, 1862 

 (Mexico); Scl. and Salv. Norn. Av. Neotrop., 30 part (Mexico), 1873. 



Guiraca chiapeiisis sp. nov. Chiapas Grosbeak. 



Type No. 144319, U. S. Nat. Mus., Biological Survey Coll. Ad. ?, 

 Ocozocnautla, Chiapas, Mexico, August 19, 1895. Collected by E. W. 

 Nelson and E. A. Goldman. 



Distribution. The type and only known specimen was taken on the 

 low tableland of western Chiapas at an altitude of about 3000 feet. 



Description of type. Entire dorsal surface dark brown, upper tail coverts 

 shaded with grayish ; feathers of back darkest along shafts with narrow, 

 indistinct edging of lighter brown ; top of head and neck nearly uniform 

 dark brown with distinct gloss of blue ; this blue gloss is faintly visible 

 also on sides of neck and shoulders. Wings slightly darker brown than 

 back and crossed by two bands of dull buffy formed by narrow tips to 

 greater and lesser coverts ; the band on lesser coverts broadest. Ear 

 coverts and cheeks dark, dingy buffy-brown ; feathers on middle of chin 



