436 PICIDA. 
Mazatlan (Forrer), Mazatlan (Grayson 6 29 30), Tres Marias Is. (Grayson § 28 30, 
Forrer), Nuevo Laredo, Topo Chico, Hacienda de las Escobas, Nuevo Leon (F. B. 
Armstrong), Sierra above Ciudad Victoria, Soto La Marina, Aldama, Tampico, 
Plains of San Luis Potosi, Aguas Calientes, Sierra de Nayarit, Bolafios, Calvillo 
(W. B. Richardson), Mineral de San Sebastian near Mascota, Jalisco (Dr. A, C. 
Buller, in Mus. Rothschild), Guanajuato (Dugés. ‘), Santana, Zapotlan, Beltran, 
Zacoalco (W. Lloyd), Volcan de Colima (W. B. Richardson), Valley of Mexico 
(Sumichrast 7, Herrera 1°), Tetelco, Chimalpa ( Ferrari-Peres), Jalapa 7° (de 
Oca *?", F. D. G., Hoge), Coatepec, Huatusco, Plan del Rio, Cordova (Ferrari-Perez), 
Orizaba (Sumichrast , Botteri >), Puente Colorado (Sumichrast 1°), Chietla 1°, San 
Miguel Molino (Ferrari. Perez), Pinal near Puebla (7. D. G.), Amula (Mrs. H. H. 
Smith), Oaxaca (Fenochio), Sola, Juchatengo (M. Trujillo), Merida in Yucatan 
(Schott ®, Gauwmer'*), Pocul in Yucatan (Cabot1),.Tunkas, Tekanto (Stone & 
Baker 8), Tizimin, Chable (Gawmer 1"), Cozumel I. (Devis 18). 
This little Woodpecker was described by Wagler from Mexican specimens, the 
precise origin of which was not stated. In all probability they came from the high- 
lands of Central Mexico. 
It is now known to be generally distributed over nearly the whole of the tablelands 
of Mexico, and in various forms to the Rio Grande Valley, the western coast of Mexico, 
the Tres Marias Islands, and to Northern Yucatan. The birds from all these localities 
have had names bestowed upon them, but from the large series of specimens before us we 
find it hardly possible to differentiate between them. We thus go rather further than 
Mr. Hargitt in this conclusion, for he kept the Tres Marias Islands’ bird as a subspecies, 
whereas we are unable to distinguish it from the bird of the opposite mainland, which 
again seems to merge into the generalized type. 
The bird of the north, which crosses the Rio Grande into Texas and Arizona, has been 
called Picus bairdi; it is usually a large bird, and has the white dorsal bands rather 
wide. It seems to pass gradually into the bird of Central Mexico. The bird of Sinaloa 
has been called Dryobates scalaris sinaloensis on account of the deficient barring of the 
outer web of the outer rectrix, in which it agrees with the larger form found in Lower 
California, D. lucastanus; this character is decidedly variable, and we are not disposed 
to lay much stress upon it. ‘The Tres Marias Islands’ bird was separated as D. scalaris 
graysont chiefly on the absence of spots on the primary coverts, but in this respect our 
specimens agree with those from Mazatlan and with others from the Valley of Mexico. 
The bird of Northern Yucatan was described by Dr. Cabot as Picus parvus, and is the 
Dryobates scalaris parvus of Mr. Ridgway. Birds from this district are small, but can 
be matched with others from Jalapa and its neighbourhood. 
In the Tres Marias Islands, Grayson says ®, “this Woodpecker is more abundant 
than on the main coast, where it is also a common species. I have met with it along 
