Paraguay, Bolivia, and Southern Brazil. 91 



were observed carrying grass and feathers to an old Oven- 

 bird's nest on the 8th of October at Boca de liomiguera. 



21. Petrochelidon pyrrhonota. 



Petrochelidon p7jrrhonota Sharpe, Cat. B. x. p. 201 ; Arg. 

 Orn. i. p. 30. 



a, b,c. S ' 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 2ud, all migrating northwards ; and again on Feb. 23, 

 191 0_, 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,ej. S ?yg- „ „ Mar. 3, 1909. 



ff. ? 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 forw ards 

 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. IIG. 

 a. S ad. Los Ynglases, Ajo. May 9, 1909. 



