186 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



tbe live bird, these parts are stated to be, respectively, light plumbeous, 

 with white nail, and intense rose-red. Iris is said to be brown or almost 

 black. The legs are, in the skin, light brownish; in the live bird, pale 

 flesh color. 



Tbe head and the upper two-thirds of the neck are of a beautiful 

 blackish-brown color, with velvet gloss; a narrow white stripe sur- 

 rounds the eye, from the hind angle of which it extends backward into 

 the nape, but without meeting the stripe from the other side. On the 

 chin a large white spot. The whole remaining plumage is pure white. 



9 differs from the c? only in being smaller. 



Coll. Stejneger No. 711, (<? jun. South America). 



Length of bill along gape 69™°', from the tip to the front of the nos- 

 trils 39'"™, to the fore border of the eye 98™™, breadth at the nostrils 

 25™™. Length of toes with claw: outer toe 103, middle toe 110, inner toe 

 01, and hind toe 22™™. Length of tarsus 87, tailfeathers 110, and wing 

 400'"™. 



The bill, which does not show the slightest trace of a frontal knob, is, 

 in the dried condition, dark yellowish-red at the base, gradually chang- 

 ing into dark brownish towards the tip ; the nail light yellowish. Legs 

 light yellowish gray, with darker webs. 



The plumage is white with pale rusty edges on each feather, this 

 tinge being most intense on the upper parts. The head and the upper 

 two-thirds of the neck, as in the adult described above; the brown, 

 however, being considerably lighter. The limit of the feathering round 

 the base of the bill very light, becoming almost white round the eye 

 and on the chin, on which the light color forms a rather large spot; 

 from the hind angle of each eye the white stripe extends backward, 

 nearly meeting its fellow on the median line of the nai)e. The prima- 

 ries are white, the tips broadly edged with dark chocolate-brown on the 

 outer five, becoming narrower and fainter on the following quills; in 

 the former, the colored edge is about 20™™ broad at the tips, tapering 

 towards the base on both webs, and becoming first obsolete on the outer 

 web; the shafts of the outer quills are brown for the most part, gradu- 

 ally decreasing towards the innermost, the shafts of which are almost 

 white to the very tip. The primary coverts are also more or less marked 

 with brown shadings on the tips of the webs and shafts. 



Another young specimen, U. S. Nat. Mus., No. 49530 (9 jim. — Con- 

 chitas, Buenos Ayres, June, 18GG), shows the following dimensions: 

 Length of bill from the tip to the mouth Gl'"™, to the fore border of 

 the nostrils 34'"™, to the front of the eye 83™™, breadth 21™™. Length 

 of toes with claw : outer toe 87, middle toe 95, inner toe 74, and hind toe, 

 20™™. Tarsus 88, tailfeathers 104, and wings 395™™. 



No trace of fi'ontal knob, the culmen only slightly rising above the 

 nostrils. 



Color as in the foregoing specimen, with the exception that the 

 white behind the eyes is almost wanting, and the edges of the feathers 



