91 
Paraguay , Bolivia, and Southern Brazil. 
were observed carrying grass and feathers to an old Oven- 
bird’s nest on the 8th of October at Boca de Homiguera. 
21. Petrochelidon pyrrhonota. 
Petrochelidon pyrrhonota Sharpe, Cat. B. x. p. 201; Arg. 
Orn. i. p. 30. 
a, b, c. <$ . Luiconia, Ajo. March 2, 1909. 
Irides dark brown; bill black ; legs and toes sooty 
brown. 
All the specimens are just completing the moult. 
Numbers of this Swallow were seen at Luiconia on 
March 2nd, all migrating northwards; and again on Peb. 23, 
1910, several were observed on the coast going westwards. 
22. Tachycineta leucorrhoa. 
Tachycineta leucorrhous Sharpe, Cat. B. x. p. 114. 
Tachycineta leucorrhoa Arg. Orn. i. p. 30. 
a. ad. Los Ynglases, Ajo. Oct. 20, 1908. 
b, c, d , e,f. S ? yg. » „ Mar. 3, 1909. 
g. $ ad. „ ,, Dec. 21, 1909. 
The young differ from the adults in being duller above 
and having white edges to the inner secondaries. 
The White-rumped Swallow is a summer visitor to the 
Ajo district, appearing about the end of July and leaving 
again about March. 
It is generally observed hawking backwards and forwards 
over the open camp close above the surface of the ground, 
and is extremely fond of circling round the rider’s horse in 
order to catch the insects either disturbed by the animal or 
those that often follow. 
It breeds both under the roofs of houses and in holes in 
the trees, and from the latter I have taken most of my nests. 
The nest is made of grass warmly and thickly lined with 
feathers, and five eggs apparently make the full clutch. 
23. Tachycineta meyeni. 
Tachycineta meyeni Sharpe, Cat. B. x. p. 116. 
a. £ ad. Los Ynglases, Ajo. May 9, 1909. 
