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Published by CHICAGO NATURAL HISTORY MUSEUM
Volume 31 June 30, 1949 No. 30
A NEW SPECIES OF TINAMUS FROM PERU
BOARDMAN CONOVER Research Associate, Division of Birds
Chicago Natural History Museum recently received a small collection of birds from the Marcapata Valley, Cuzco, Peru. Among them were four specimens of Tinamus from the Hacienda Cadena. One is an example of Tinamus major peruvianus, but the other three, all females, belong to a hitherto unknown species of the genus.
Direct comparison has been made with specimens of the four previously known species, T. tao, solitarius, major, and guttatus. The coloration of the new bird is entirely different, the dorsal surface being uniform, lacking the prominent bars and vermiculations found in all the other members of the genus. Its measurements are nearest to solitarius, but the tarsus and toes seem heavier, more like those of tao.
I take pleasure in naming this species after the late Wilfred H. Osgood, for many years Chief Curator of the Department of Zoology in this Museum.
Tinamus osgoodi sp. nov. Osgood's Tinamou.
Type. — From the Hacienda Cadena, Cadena, Marcapata Valley, Cuzco, Peru. Altitude 3,000 feet. No. 17510 Conover Collection, Chicago Natural History Museum. Adult female. Collected February 9, 1949, by Celestino Kalinowski. Original number 179.
Characters. — General appearance black, especially on the dorsal surface, head, neck and upper chest.
Differs from all the other species of Tinamus by having the upper parts, sides of the face, neck, and upper chest black. Size slightly larger than T. major peruvianus but tarsus and toes much longer and heavier, resembling T. tao in this respect.
Description of type. — Throat gray, shading into black on the fore neck; rest of head, neck, upper chest, mantle, scapulars, tertials, back, rump and tail Slate Black (of Ridgway); upper tail coverts black, very narrowly and indistinctly tipped with ochraceous (when
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ABC
Fig. 66. A, Tinamus tao weddelli; B, Tinamus osgoodi sp. nov. (type); C, Tinamus major peruvianus. The figure illustrates very well the dark coloration of the new species. The light markings showing on the upper back are reflections. The actual coloration is uniform slaty black.
unworn), and with broad, very indistinct (almost obsolescent) bars of dusky brown ; lesser upper wing coverts, secondaries, and primaries black; greater upper wing coverts dusky brown, with almost obsolete blackish vermiculations; lesser under wing coverts dusky, greater
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A B C
Fig. 67. A, Tinamus tao weddelli; B, Tinamus osgoodi sp. nov. (type); C, Tinamus major peruvianus. The uniform gray throat, slaty black chest, dull brown breast and buffy crissum of the new species are shown fairly well in this figure. Note the longer toes of osgoodi as compared to those of major.
under wing coverts grayish; lower chest, breast, and thighs dull slaty brown; flanks the same but more washed with gray; crissum and lower flanks dusky at base but widely tipped with ochraceous buff, speckled and vermiculated with dusky; under tail coverts
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ochraceous tawny vermiculated and barred with dusky. Iris coffee- colored (cafe), bill black and light gray (negro y plomo claro), feet lead-colored (plomo). Wing (flat) 259; culmen 36; tarsus 75; middle toe with claw 47 mm.
Range. — Known only from the type locality.
Remarks. — The ochraceous buff markings of the crissum and extreme lower flanks are much less in evidence in the two paratypes, both adult females. However, this is probably because of wear, as they are in worn plumage. For the same reason, their upper parts are duller, not quite as slate black as are those of the type.
Because of the dark appearance of these three Marcapata birds, it was thought at first that they might be melanistic examples of one of the other species of the genus. However, this idea was dis- carded for the following reasons: The specimens could not be assigned to guttatus because of its much smaller size, nor to solitarius, because its range nowhere approaches the Andes. The tarsus and toes of major are much shorter and lighter (61-71 against 75-79 and 35-39 against 46-48 mm., respectively). Finally, in tao the white feathers of the throat are edged with dusky but in the specimens of osgoodi, these feathers are plain dull gray with no signs of darker edges, as one would expect in melanistic examples.
SPECIMENS EXAMINED
Tinamus tao tao. — 1: Peru (Loreto, Rio Ucayali, Cerro Azul, 1). Tinamus tao kleei. — 1: Peru (Rio Urubamba, 1).
Tinamus tao weddelli. — 6 : Bolivia (Cerro Hosane, Santa Cruz, 1 ; Ichilo, Santa Cruz, 1; Palmar, Yungas de Cochabamba, 2; La Pampa, Sandia, 2).
Tinamus osgoodi. — 3: Peru (Hacienda Cadena, Cadena, Rio Marcapata, Cuzco, 3).
Tinamus solitarius. — 2: Brazil (Raul Soares, Minas Geraes, 1; Estado Santa Catharina, 1).
Tinamus major peruvianus. — 14: Peru (Hacienda Cadena, Cadena, Marcapata, Cuzco, 1; Rio Urubamba, 2; Yarinacocha, Rio Ucayali, Loreto, 1) ; Bolivia, Santa Cruz (Buena Vista, 3; Rio Surutu, 3; Rio Ichilo, 1; Matarcu, Ichilo, 2; Rio Colorado, Ichilo, 1).
Tinamus guttatus. — 3: Peru (Yarinacocha, Rio Ucayali, Loreto, 3).
I am indebted to the Academy of Natural Sciences of Philadelphia for the loan of specimens.
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