152 RIDGWAY 



Similar to Scaphidurus major graysoni but slightly smaller, with 

 slightly longer bill ; adult female much paler, the under parts (in winter 

 plumage) light wood brown, passing into brownish cream-buff on throat 

 and chin, into grayish brown on flanks, thighs and anal region, the 

 under tail-covei'ts dark grayish brown, pileum and hindneck light 

 sepia-brown, the scapulars and interscapulars margined with the same. 



Coast district of Sonora, northwestern Mexico. 



Type, no. 164596, U. S. National Museum (Biol. Surv. Coll., no. 

 6140), 9 ad., Alamos, Sonora, Jan. 37, 1S99; E. A. Goldman. 



The known forms belonging to this genus are, according to my 

 recent revision of the group, as follows : 



(i) Scaphidurus major major (Vieillot) ; South Atlantic and Gulf 

 Coast United States. 



(2) Scaphidurus major macrourus (Swainson) ; southern Texas 

 to northern Columbia. 



(3) Scaphidurus major obscurus (Nelson) ; southwestern Mexico. 



(4) Scaphidurus major graysoni (Sclater) ; western Mexico. 



(5) Scaphidurus major nelsoni Ridgway ; northwestern Mexico. 



(6) Scaphidurus major assimilis (Sclater) ; central Colombia. 



(7) Scaphidurus tenuirostris (Swainson) ; central Mexico. 



(8) Scaphidurus nicaraguensis (Salvin & Godman) ; Nicaragua. 



Icterus cucullatus sennetti. Sennett's Oriole. 



Similar to Icterus cucullatus czicullatus (Swainson) but paler in 

 color ; adult male less decidedly orange, the color of pileum, chest, 

 etc., deep cadmium yellow, never cadmium orange; adult female 

 much paler than that of /. c. cticullatus, the yellow of under parts 

 dull or pale gamboge, instead of saffron or ochreous, the back and 

 scapulars lighter grayish. 



Lower Rio Grande Valley, in Texas and Tamaulipas ; south in 

 winter to Morelos. 



Type, no. 73654, U. S. National Museum, $ ad., Brownsville, 

 Texas, April 3, 1877; Geo. B. Sennett. 



Icterus gularis tamaulipensis. Alta Mira Oriole. 



Similar to Icteriis gularis gularis (Wagler) but decidedly smaller 

 and coloration more intense, the orange-yellow more decidedly orange 

 (usually rich cadmium orange) ; black at anterior extremity of malar 

 region broader ; bill shorter and deeper at base. Similar to Icterus 

 gularis yucatane?tsis, Berlepsch, but larger, usually less intense in 

 color, and with the maxilla relatively much narrower. 



