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. (nec Gm.) Enc. Meth. 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. d ad. Sapucay, October 8, 1902. Iris dark brown. 
b, c. d ? 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.~\ 
44. 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, 
