BIRDS OF ARGENTINA, PARAGUAY, URUGUAY, AND CHILE 45 



With regard to the genus name Colymbus, I have followed Ameri- 

 can custom in applying it to a group of grebes, though there is uncer- 

 tainty as to whether it belongs to that family or to the loons. Dr. 

 Witmer Stone in the Auk, 1923 (pp. 147-148), has reviewed the case 

 briefly and is inclined to consider that Colyvibus should go to the 

 loons. His argument on the matter is readily accessible and need 

 not be quoted here. It may be noted, however, that though Gray in 

 1840 and 1841 cites G. glacialis Linnaeus as type of Colymhus with- 

 out comment, in an appendix issued in 1842 containing revisions to 

 his second edition he remarks (p. 15), '•'' Colyvibus^ after L. add 

 (1735)," thus indicating that here, as in 1855, he had the edition of 

 Linnaeus for 1735 in mind. The earliest definite fixation of type for 

 Colyinbus Linnaeus 1758 is apparently that of Baird, Brewer, and 

 Ridgway, Water Birds (vol. 2, 1884, p. 425), where it is cited as 

 Colymhus cHstatus Linnaeus. For much of the matter given above 

 I am indebted to Dr. C. W. Eichmond. 



COLYMBUS CHILENSIS (Lesson) 



Podiceps chUeiisis " Garnot " Lesson, Man. d'Orn., vol. 2, June, 182S, p. 

 358. (Concepcion Bay, Chile.) 



This species was first described by Lesson in his Manuel d'Orni- 

 thologie under the names of Podiceps chilensis and P. americanus, of 

 which P. chilensis has anteriority, as P. myiencanus is given lower 

 down on the same page. The species has been commonly accepted 

 under the name aniericanus, dating from Podiceps mnericanus Les- 

 son and Garnot,^^ which, however, is preoccupied by the name used 

 above. The designation Podiceps chiliens-is occurs in the work last 

 cited, but on page 601. 



On November 2, 1920, at the Estancia Los Yngleses, near Lavalle, 

 Province of Buenos Aires, I secured an adult male of this species in 

 full plumage. While watching a small pool surrounded by rushes, I 

 had a glimpse of the neck of one of these birds projecting above the 

 surface of the water, but it disappeared at once. I remained hidden 

 for several minutes, making a variety of cooing and grunting calls, 

 until suddenly, without a ripple on the water or a sound, the bird 

 appeared in the center of the pool directly in front of me, where by a 

 quick shot, it was secured. The bill of this individual was black; 

 iris slightly lighter than carmine ; tarsus and toes dark neutral gray, 

 blotched with deep to light olive gray, with the under surface of the 

 webs blachish slate. 



At General Roca, Rio Negro, on December 3. these small 

 grebes were common along quiet channels bordered with rushes and 



* Voyage Autour du Monde, Coquille, Zoologie, vol. 1, November, 1820, p. 599. 



