158 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.41. 



From Bryohates scalaris cactopMlus this form may be distinguished 

 by smaller size; more deeply colored ventral surface, with only streaks 

 (no spots) on the sides of the breast; darker upper parts, the white 

 bars slightly narrower, the black ones somewhat broader; and 

 smaller white spots on outer webs of primary coverts. It differs from 

 Bryohates scalaris sinaloensis in its much greater dimensions; lighter 

 under surface; entirely black-barred outer web of outermost long 

 rectrix; wider postocular and malar stripes, the latter not obsolete 

 at base of bill ; somewhat broader black bars on upper parts; and wider 

 black bars on the tail-feathers. Compared to Bryohates scalaris 

 azelus, it is very much larger; has the outer web of outermost long 

 rectrix barred throughout with black; the breast and sides streaked, 

 instead of spotted, but less heavily thus marked; wider postocular 

 and malar stripes, the latter always extending to the base of the bill; 

 somewhat broader black bars above; and somewhat more white on 

 outer webs of primary coverts. It may be separated from Bryohates 

 scalaris scalaris by its decidedly greater size; streaked instead of spot- 

 ted, and more heavily thus marked sides of breast; broader black 

 bars on upper surface; wider postocular and malar stripes, the latter 

 not obsolete at the base of the bill. 



Specimens from La Pisagua, Jalisco, are of the same size as the 

 present form, but are more extensively white above, and in this, as 

 well as other respects, appear to be somewhat intermediate between 

 Bryohates s. centropMlus and Bryohates s. azelus, though nearer, of 

 course, to the former. Birds from Aguas Calientes^ we have not seen, 

 and they may belong to either Bryohates scalaris centropMlus or Bry- 

 ohates scalaris hairdi. 



Eighteen examples have been available, from the Mexican locali- 

 ties below: 



Burango. — Durango . 



Jalisco. — Atemajac (north of Guadalajara) ; Ocotlan; Ameca; La 

 Pisagua; Las Canoas; Guadalajara. 



Michoacan. — Patamban; Uruapam. 



Tepic. — Arroyo de Gavilan (near Amatlan). 



Zacatecas. — San Juan Capistrano. 



DRYOBATES SCALARIS BAIRDI (Malherbe). 



Picus hairdi Malherbe, Mon. Picidees, vol. 1, 1861, p. 118, pi. 27, figs. 7, 8 

 (SclaterMS.). 



Chars, suhsp. — Resembling Bryohates scalaris centropMlus, but 

 somewhat larger; ventral surface darker; black bars on the back 

 broader; and postocular stripe wider. 



Measurements. — Male:^ Wing, 102-107.5 (average, 104.4) mm.; 

 tail, 56-62.5 (60.1); exposed culmen, 20-23.5 (22.1); tarsus, 17-18.5 

 (17.7); middle toe, 12-14 (12.7). 



1 Hargitt, Cat. Birds Brit. Mus., vol. IS, 1890, p. 248. 



2 Seven specimens, from the Mexican States of Hidalgo, Guanajuato, Coahuila, and San Luis Potosi. 



