BIKDS OF ARGENTINA, PARAGUAY, URUGUAY, AND CHILE 329 



Ui-ugiiay, February 14, and a male from Tapia, Tucuman, April 13. 

 The species was common in thickets near streams in southern Uru- 

 guay (La Paloma, January 23, San Vicente, January 25 to 31, Rio 

 Negro, February 14), but in Argentina was seen only on the two oc- 

 casions when specimens were taken, as noted above. The birds were 

 found on low perches among rather dense growth, where they made 

 short flights from twig to twig or rested quietly with twitching tail. 

 At the end of January they were breeding, and young were on the 

 wing by the middle of February. Males in the nesting season gave 

 an emphatic little song like that of some Einpldonax^ uttered from 

 secure retreat among willows or similar shrubs. When alarmed 

 about their nests they uttered a low tsip. 



MYIOPAGIS VIRmiCATA VIRIDICATA (Vieillot) 



Sylvia viridicata Vieillot, Nouv. Diet. Hist. Nat., vol. 11, 1817, p. 171. 

 (Paraguay.) 



On September 30, 1920, at the base of the Cerro Lorito on the 

 eastern bank of the Rio Paraguay, opposite Puerto Pinasco, Para- 

 guay, attention was attracted to this flycatcher by its sharp ex- 

 plosive note cJiur esp. The bird perched in heavy cover in the tops 

 of trees and shrubs, in dense forest, occasionally flying out after 

 insects. Only through its peculiar call was I able to follow it and 

 secure it. It proved to be an adult male in breeding condition. This 

 bird has the following measurements: Wing, 63.7; tail, 59.8; culmen 

 from base, 10.6; tarsus, 15.7 mm." 



SUIRIRI SUIRIRI (Vieillot) 



Muscicapa suiriri Vieillot, Nouv. Diet. Hist. Nat., vol. 21, 1818, p. 487. 

 (Paraguay.) 



The suiriri flycatcher was common through the Chaco from north- 

 ern Argentina into Paraguay, and in the wooded country in the 

 territory of Pampa and northern Tucuman. Dates and localities 

 (with specimens preserved indicated in parentheses) at which it was 

 recorded are as follows: Las Palmas, Chaco, July 13 to 31, 1920 

 (male taken July 13, female July 18) ; Riacho Pilaga, Formosa, 

 August 7 to 18; Formosa, Formosa, August 23; Kilometer 80, west 

 of Puerto Pinasco, Paraguay, September 7 to 20 (females taken 

 September 7 and 11) ; Kilometer 200, west of the same point, Sep- 

 tember 25; Victorica, Pampa, December 23 to 29 (adult male taken 

 December 23, two adult females December 24 and 28) ; Tapia, Tu- 

 cuman, April 6 to 13) males taken April 6, 11, and 13, on* juvenile 

 with sex indeterminate September 11). Birds secured in December 

 were in worn plumage, those shot in April were in molt. In the 

 Juvenal plumage (shown by one individual) described previously 



" For discussion of the forms of this species, see Berlepsch, Proc. Fourth Int. Ornith. 

 Congr., February, 1907, pp. 425'-431. 



