368 BULLETIN 133, UNITED STATES NATIONAL MUSEUM 



peer about, in the slow manner usual to vireos. At a squeak they 

 came down to peer at me with the crown feathers raised. The 

 song, given Avithout interruption during search for food, is a series 

 of phrases, similar to but possibly slightly less emphatic than that 

 of the northern red-eye. 



At Tapia, Tucuman, from April 10 to 13, the species was fairly 

 common in dense scrub, where it traveled in company with parula 

 warblers and other small bush and tree haunting birds. The birds 

 had ceased singing then, though their complaining call note was 

 heard at intervals. An adult male taken was extremely fat. 



An adult male, shot January 30, had the maxilla dusky neutral 

 gray; base of gonys washed with pallid brownish drab; r. st of 

 mandible clear green-blue gray; iris Vandyke brown; tarsus and 

 toes light Medici blue. 



Family COMPSOTHLYPIDAE 



BASILEUTERUS HYPOLEUCUS Bonaparte 



Basileuterua hypoleucus Bonaparte, Consp. Av., vol. 1, 1850, p. 313. 

 (Brazil.) 



An adult female, shot September 1, 1920, at Kilometer 25, west 

 of Puerto Pinasco, Paraguay, the only specimen collected, differs 

 from skins of hyj)oleucus from Matto Grosso in the yellow under 

 tail coverts and the yellowish wash on the lower breast and abdomen. 

 It is possible that this bird represents a distinct race. 



The specimen was one of several found in heavy woods on a low 

 hill, where the birds fed actively througli the tops of the lower 

 growth. They were observed in little parties of three or four, 

 apparently families since a part were fully grown young. 



BASILEUTERUS AURICAPILLUS AURICAPILLUS (Swainson) 



Setophaga anricapilla Swainson. Auim. in Meuag., 1S38, p. 293. (Brazil.) 



Near Las Palmas, Chaco, this Basileuterus was fairly common on 

 July 13, 14, 17, and 21, 1920. Two were taken, an adult female, 

 July 13, and one with sex not marked, July 21. The birds fre- 

 quented dense thickets and heavy woods, where they hopped ac- 

 tively about among the smaller twigs with flitting wings and jerk- 

 ing tail. On February 5, 1921, I secured another, an immature 

 male, found in dense growth along the Rio Cebollati, near Laz- 

 cano, Uruguay, in company with a mixed flock of Serpophaga and 

 Thamnophilus. The Basileuterus worked through the lower limbs 

 between 1 and 2 meters from the ground with the tail wagging in 

 a characteristic manner. 



