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A New House Finch from Central Mexico

Robert T. Moore
1937 The Condor  
For some time the author has been convinced that the large House Finches of Guanajuato represent a new form, differing not only from the described forms to the east and south but also from the birds of the Central Plateau to the west, formerly known as rhodocotfus. It seemed better to hold description in abeyance until the accumulation of additional specimens from southwestern Chihuahua might determine whether the Jalisco-Durango plateau birds are closer to frontalis of New Mexico and Texas or
more » ... exico and Texas or to so-called sonoriensis of Sonora. Fourteen fresh specimens from localities in southwestern Chihuahua and ten from northeastern Sinaloa have simplified the problem. I am therefore describing below the form from Guanajuato. Carpodacus mexicanus centralis, new subspecies. Guanajuato House Finch. Type.-Male adult in worn breeding plumage; no. 105265, ~011. U. S. Nat. Mus.; Guanajuato, Mexico; collected by Prof. Alfred0 Dug&s. Subspecific characters.-Largest of all races of Carpodacus me&anus differs from C. m. @tosinus, C. m. nigrescens and C. tnexicanus mexicanus not only in this respect but also in greater extension of red on underparts of breeding males; differs from the former two, in addition, by less heavy, and lighter-colored, streaks below. Its great size and much heavier streaking distinguish cewtralis at a glance from rhodopws, as well as from so-called sonoriensis and ruberrimus. It is closer to the large birds of southwest Texas (frontalis?), but from them it is distinguished by greater extension of red on the underparts and by larger size. Range.-Vicinity of Guanajuato City, probably extending over the adjacent mountains and plateaus above 6000 feet.
doi:10.2307/1363805 fatcat:mh4ughebmjeixix7og6bif5coy