Birds of Paraguay. 267 



transformed into the bird, which would account in a way 

 for the strange cry. It is resident, as I have heard its cry 

 in October and shot one specimen in November. — W. F.~\ 



43. Nyctidromus derbyanus. 



Ibiyau Azara, Apunt. ii. p. 538. no. cccx. (1805). 



Caprimulgus albicollis Vieill. (nee Gm.) Enc. Metli. ii. 

 p. 536 (1822 : Paraguay). 



Nyctidromus albicollis Berlepsch, J. f. O. 1887, p. 120 

 (Paraguay) ; Hartert, Cat. B. Brit. Mus. xvi. p. 587, part. 

 (1892). 



Nyctidromus albicollis derbyanus Gould ; Hellmayr, Nov. 

 Zool. xii. p. 297 (1905) ; Ihering, Revista Mus. Paulista, vi. 

 p. 332. 



a. <$ ad. Sapucay, October 8, 1902. Iris dark brown. 



b, c. <$ ? ad. Sapucay, April 1903. Feet dark horn- 

 coloured. 



d, e. $ ? ad. Sapucay, March and June 1904. 



Four clutches of eggs were collected during the month of 

 October 1903. They vary in ground-colour from greyish 

 pink to creamy, spotted and blotched with pinkish brown 

 and underlying marks of lavender-grey. The mea- 

 surements are: Axis 1*1 to 1"25 inches; diameter 0*85 

 to 0-9. 



[A fairly common species at Sapucay, frequently met 

 with in the open glades and cattle-tracts in the forest. 

 The eggs, two in number, are laid on the bare ground, 

 but the bird will never rise unless almost stepped upon, 

 and its plumage is hard to detect in the lights and 

 shadows of the woods. — W. F.~\ 



4<4i. Caprimulgus parvulus. 



Caprimulgus parvulus Gould, P. Z. S. 1837, p. 22 (Santa 

 Fe, Rio Parana) ; Hartert, Cat. B. Brit. Mus. xvi. p. 574 

 (1892) ; Ihering, Revista Mus. Paulista, vi. p. 332. 



a. $ ad. Sapucay, November 18, 1902. 



Two eggs were obtained on the same date and another 

 clutch on October 12, 1903. They are pale cream-coloured, 



