90 Mr. C. H. B. Grant on Birds collected in Argentina , 
weeks with P. domestica , which was breeding in the out¬ 
buildings, and, fearing that it would leave, I at last shot it. 
19. Progne domestica. 
Progne domestica Sharpe, Cat. B. x. p. 177. 
Progne chalybea Arg. Orn. i. p. 25. 
a. $ young. Los Ynglases, Ajo. Jan. 14, 1909. 
b. ? youug. „ ,, Feb. 7, 1909. 
c. $ ad. „ „ March 2, 1909. 
d. $ ad. Colonia Mihanovitch, N. Argentine. Aug. 13, 
1909. 
The March bird is moulting. 
A summer visitor to the Ajo district, and breeding in 
the outbuildings, the nest being placed on a horizontal 
rafter or support. It is composed of mud and grass and 
lined with feathers : five or six eggs form the complete 
clutch. 
The young differ from the adult, as in P. chalybea. 
20. Progne tapera. 
Progne tapera Sharpe, Cat. B. x. p. 180; Arg. Orn. i. 
p. 26 . 
a. $ ad. Los Ynglases, Ajo. Oct. 20, 1908. 
b. ? ad. „ „ Jan. 25, 1909. 
c y d,e. ? ad. „ „ Feb. 4-16, 1909. 
/, g. S ad. Rabicho, Brazil. Oct. 8, 1909. 
h, i. $ ? ad. Nr. Villa Pilar, Paraguay. Nov. 7, 1909. 
k. £ . Nr. Esquina, N. Argentine. Nov. 14, 1909. 
Irides hazel; bill, legs, and toes sooty brown. 
The February specimens are rather worn, but are not 
moulting, and all appear to be fully adult. 
This arrives later than any of the other Swallows in 
the Ajo district, and does not leave till winter is well in. 
It occupies the nests of Furnarius rufus after the latter 
has left them, and its own nest is composed of grass and 
feathers. 
On the river expedition a few were seen between Puerto 
Pinasco and Puerto Maria on the 7th of September, and a pair 
