390 Mr. E. Gibson on the Ornithology of [Ibis, 



bluish white, thickly speckled and spotted with reddish 

 brown. Sometimes these markings are generally distributed 

 and large ; in other cases small and delicate, or gathered in 

 a ring at the blunt end. Measurements : 18 x 14 mm. 



94. Molothrus bonariensis (Gm.). Argentine Cow-bird. 

 Since I wrote my former notes on this species, its habits, 



parasitical and otherwise, have been so well described by 

 Mr. Hudson that further comment would be superfluous. 

 From him I have learned that not only the pure white eggs 

 found in so many strange nests are attributable to M. bona- 

 riensis, but also an endless variety of coloured specimens. 

 Perhaps the principal characteristic which distinguishes 

 them all is the thickness and strength of the shell, to wiiich 

 may be added the very round shape and glossy texture. 

 Measurements : 22 x 19 mm. 



The iris in the adult is very dark brown. 



95. Molothrus rufoaxillaris Cassin. Screaming Cow-bird. 

 As in the case of M. bonariensis, Mr. Hudson has fully 



dealt with this species, and I have nothing worth adding 

 to his notes. 



The eggs are also round iu shape, thick-shelled, and 

 glossy, though in a less degree than the former. Ground- 

 colour pinkish white, boldly spotted, marked and streaked 

 with red and dark brown, increasing towards the blunt end. 

 Measurements : 24 x 18 mm. 



The iris in the adult is dark brown. 



96. Molothrus badius (Vieill.). Bay- winged Cow-bird. 

 Again, when Mr. Hudson has said his say about M. badius, 



there is little to add. 



It nests late with us, from the beginning of November to 

 the beginning of January. Besides the localities mentioned 

 by Mr. Hudson, I have found nests in a hole in a willow- 

 tree in the garden, built of pieces of newspapers, string, 

 and dry grass, and lined with horsehair ; in an old nest of 

 the Bienteveo Tyrant {Pitangus boHvianus), where it was 



