192 ZOOLOGY. 



have seen a third, T. Sioainsonil , Lesson, also from that country. All these very considerably 

 resemble each other in colors and other characters, but differ so materially in size as to leave 

 no doubt of their sj^ecific distinctness. T. rumicivorus is the largest, T. Swainsonii the smallest. 



ATTAGIS GAYII, Less. 



Attagis Gayii, Lesson Cent. Zool. 1830, 135. 



Gay, Fauna Chilena, Aves, 384. 

 VuLG. Perdiz Cordillerana. 

 FiGOBES. — Less. Cent. Zool. PI. xlvii. 



" Gay's Fauna Chilena Orn. PL (not numbered.) 



Several fine specimens of this remarkable bird were obtained in the Andes, which it inhabits 

 at a considerable elevation. It lives entirely on the ground, and is generally met with in small 

 parties or coveys. 



This bird appears to us to present affinities to the grouse, though exhibiting singularly well- 

 marked generic characters. It is one of the most remarkable of the birds of Chile. 



NOTHURA PEEDICAEIA, (Kittlitz.) 



Crypturus perdicarius, Kittl. Mem. Acad. St. Peters. I, 1830, 192. 



VuLG. Perdiz. 



Figure. — Mem. Acad. St. Peters. I, PI. xii. 



This bird is frequently met with throughout nearly the whole of Chile. It is usually seen in 

 the cultivated districts, but appears also, from specimens now before us, to be an inhabitant of 

 the mountains. It lives entirely on the ground, and is shot for the table. 



In the collection of the Expedition several specimens are considerably smaller than others, 

 though otherwise so very similar that we can determine no specific differences. The smaller 

 specimens are, moreover, labelled as females, which at present we are disposed to regard them. 

 Lieutenant Gilliss's notes on this species are as follows: "This bird never congregates in 

 flocks or coveys, but is only seen in pairs, and when startled utters a shrill noise until it 

 alights, after a few minutes' flight. The adult bird is one-fourth larger than the partridge of 

 the United States, and it attains maturity in one year; its flesh is quite as white, and more 

 juicy. It lays twelve to fourteen eggs, of a beautiful and uniform sombre violet color, highly 

 polished." 



Order IV. GRALLATORES. 



AEDEA COCCI, Linn. 



Ardea cocoi, Linn. Syst. Nat. I, 1766, 237. 



Gay, Fauna Chilena, Aves, 409. 

 Ardea coerulescens, Vieill. Nouv. Diet. XIV. 1817, 418. 

 Ardea maguari, Spis, Av. Bras. II, 1824, 71. 

 VuLG. Patagonian Heron. Cuca. 

 Figure. — Spix, Av. Bras. II, PI. xc. 

 A single specimen only of this large species is in the collection of the Expedition, and is stated 

 to have been obtained in the interior of the country. 



Lieut. Gilliss remarks : "This very rare bird in central Chile was presented by Senor Salinas, 



