Bulletin - United States National Museum - si-pddr - Smithsonian ...
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Bulletin - United States National Museum - si-pddr - Smithsonian ...

Bulletin - United States National Museum - si-pddr - Smithsonian ... Bulletin - United States National Museum - si-pddr - Smithsonian ...

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U. S. NATIONAL MUSEUM BULLETIN 133 PL. II Lowland Thickets near Laguna Castillos, Haunt of Brush Inhabiting Birds That Here Have Outpost Colonies in the Pampas Near San Vicente, Uruguay January 31, 1921 Summit of the Cerro Navarro, a Granite Outlier of the Hill Formation of Northern Uruguay San Vicente, Uruguay, January 28, 1921

BIRDS OF ARGENTINA, PARAGUAY, URUGUAY, AND CHILE 71 nently, making a conspicuous field mark. At no time were they observed flying at an altitude of more than 80 meters in the air, while usually they passed barely high enough to clear low trees, from 15 to 30 meters above the ground. In alighting they flapped heavily to break their momentum as they came down into the grass. Their tree-perching habit may be the outcome of life in a region where during the rainy season there is nowhere else to rest save in the water. An adult male taken September 7 was completing a molt of the body plumage and had the sexual organs dormant. No indication of breeding was noted among them. To the Anguete Indian the Muscovy duck was known as meh dik tee. The immature male (fully grown) secured in Formosa shows patches of old brown feathers among glossy black plumes that recently had been renewed. It does not have the broad white shoulder of the adult; there are scattered black feathers over the loral region, and the skin behind the eye is closely feathered. The caruncles of the adult are barely indicated. The adult taken in Paraguay in life had the soft parts colored as follows: Nail on both mandible and maxilla dark neutral gray; remainder of tip of bill pale drab gray, washed with livid brown on margin; spot behind nostrils, line of culmen between nostrils, as well as central portion of mandibular rami pale drab gray; band across bill in front of nostrils extending around on mandible, and base of bill, including bare skin on side of head, black; caruncles black at base, elsewhere purplish vinaceous ; iris cream buff ; tarsus and toes black. DENDROCYGNA BICOLOR BICOLOR (Vieillot) Anas Mcolor Vieillot, Nouv. Diet. Hist. Nat., vol. 5, 1816, p. 136. (Para- guay.) Near Lavalle, Province of Buenos Aires, the fulvous tree duck was common among the cailadones from October 28 to November 9, 1920. The birds ranged in flocks, frequently 30 or 40 together, that were found in open ponds where the water was a meter deep. They were frequently active at dusk. When flushed they rose with the whistled w^heezy calls that gave them their local name of pato siiflon and passed on, often flying rather high, to more distant resting places. In the air they seldom show color, aj^pearing simply as silhouettes of black against the sky. The birds on the wing differ in appearance from other ducks and offer a remarkable resemblance to ibises as they pass with rather slow wing beat and long necks outstretched, a similarity engendered by the long, bluntly pointed wing. The flight is only moderately fast. A female taken on

U. S. NATIONAL MUSEUM BULLETIN 133 PL. II<br />

Lowland Thickets near Laguna Castillos, Haunt of Brush Inhabiting<br />

Birds That Here Have Outpost Colonies in the Pampas<br />

Near San Vicente, Uruguay January 31, 1921<br />

Summit of the Cerro Navarro, a Granite Outlier of the Hill<br />

Formation of Northern Uruguay<br />

San Vicente, Uruguay, January 28, 1921

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