POLYBOKUS. IBTCTER. 233 



Polyborus chemvay, Sharpe, Cat. Birds B. M. i. p. 33 (1874) ; Scl. $ 

 Salv. P. Z. S. 1879, p. 542 ; Bendire, Life-Hist. N. Amur. Birds, i. 

 p. 315, pi. xi. figs. 1-4 (1892) : Sharpe. Hand-l. i. p. 243 (1899) ; 

 Nehrk. Kat. Eiermmml. p. 2 (1899). 



The eggs of Audubon's Caraoara are not separable from those 

 of P. tharus. The specimens in the Collection measure from 2'1 to 

 2-35 in length, and from 1'75 to 1*85 in breadth. 



1. Rio Attaskosa, Texas, 7th May Crowley Bequest. 



(H. E. Dresser}. 



1 . Rio Medina, Texas (H. E. D.). Salvin-Godman Coll. 



1. Texas (Smiths. Inst.}. Salvin-Godman Coll. 



1. San Antonio, Texas. Crowley Bequest. 



1. Matagorda, E. Mexico (T. M. Brewer}. Crowley Bequest. 



2. San Geronimo, Guatemala, 2nd April Salvin-Godman Coll. 



(R. Owen). 



2. San Geronimo, April (JR. O.}. Salvin-Godman Coll. 



2. Rio Negro, Antioquia, U.S. Colombia Salvin-Godman Coll. 



(T. K. Salmon}. 



Genus IBYCTER, Vieill. 



Ibycter megalopterus (Meyen). 



Ibycter megalopterus, Sharpe, Cat. Birds B. M. i. p. 36 (1874); id. 

 Hand-l. i. p. 244 (1899). 



The sole egg of the Large-winged Carrion-Hawk in the Collection 

 is of a very regular oval shape, smooth, and very slightly glossy. 

 It is cream-coloured, speckled and spotted all over with chocolate- 

 brown except at the broad end, where the markings form a dense 

 confluent cap. It measures 1*85 by 1-45. 



1. Chile. Crowley Bequest. 



Ibycter australis (Gm.}. 



Milvago leucurus, Gould, P. Z. S. 1859, p. 93. 



Milvago australis, Scl. Ibis, 1860, p. 25, pi. i. figs. 1 & 2 ; Abbott, Ibis, 



1861, p. 150 ; Scl. Zool. l Challenger ' Exped. ii. pt. viii. p. 150 



(1880). 

 Ibycter australis, Sharpe, Cat. Birds B. M. i. p. 38 (1874) ; id. Hand-l. 



i. p. 244 (1899) ; Nehrk. Kat. Eiersamml p. 2 (1899). 



The eggs of the Southern Carrion-Hawk resemble those of 

 Polyborus tharus and P. clieriway so closely as to require no separate 

 description. One specimen, however, is abnormal, being nearly 

 spherical in shape and of a cream- colour, very sparingly mottled 

 with pale rufous. It measures 1-6 by 1*45. Normal examples 

 measure from 2-35 to 2-65 in length, and from 1'85 to 1*92 in 

 breadth. 



2. Falkland Islands. Voy. H.M.S. < Challenger.' 



3. Falkland Islands (C. C. Abbott). Salvin-Godman Coll. 

 5. Falkland Islands (C. C. A.). Gould Coll. 



2. . Falkland Islands, Oct. (C. C. A.}. Crowley Bequest. 



