310 BULLETIN 133, UNITED STATES NATIONAL MUSEUM 



immature female was shot near Tapia, Tucuman, on April 11, 1921. 

 The two adults are in full breeding plumage. The third specimen, 

 in partial juvenal plumage, is duller, less yellow below and on the 

 superciliary, is grayer above, and has two broad, light streaks on the 

 wing, formed by whitish tips on greater and middle wing coverts. 

 At Los Yngleses, on October 30, a pair of these flycatchers had 

 begun a nest in a fruit tree in the yard, and the female was busily 

 engaged in carrying nest material to arrange it in a cuplike form in 

 a convenient crotch. Other birds were recorded on November 1 

 and 9, and one was seen near Lavalle November 13. In appearance 

 and actions the birds were typical flycatchers. They chose resting 

 perches among leafy branches, and when their backs were turned 

 to the observer were inconspicuous. One captured a large cater- 

 pillar, killed it, and swallowed it. At Tapia, Tucuman, two were 

 observed occupying low perches in open trees in dry forest. They 

 were in company with a band of other passerines that appeared to 

 be in migration as they moved rapidly through the scrub. 



ARUNDINICOLA LEUCOCEPHALA (Linnaeus) 



Pipra leucocephala Linnaeus, Mus. Ad. Frid. Reg., vol. 2, 1764, p. 33. 

 (Surinam.^) 



At the Riacho Pilaga, Formosa, an adult male was secured on 

 August 8, 1920, and a male in immature dress on the day following. 

 The birds were recorded on August 16 and 17, and one shot on 

 the latter day was preserved in alcohol. The immature specimen 

 has the black of the adult replaced by white on the breast and abdo- 

 men, and by brownish gray on the back, wings, and sides. The 

 adult specimen seems to have a larger bill (culmen from base, 18.5 

 nun.) than the few examined from Bahia, Santarem, Demerara, 

 and other points in northern South America. 



These odd flycatchers were fairly common in the outer growths of 

 tall cat-tails that fringed lagoons, where it was difficult to secure 

 them as one might work about the shore line for days without catch- 

 ing sight of one save by chance. When I paddled out across the 

 water in a clumsy boat hewn from the trunk of a silk-cotton tree, 

 or on a crude raft made of a bundle of cat-tails lashed together, these 

 birds were more in evidence, but it was difficult at that to retrieve 

 specimens that were shot. Ordinarily these flycatchers rested quietly 

 on low perches among the rushes, with the tail twitching quickly, 

 while at short intervals they sallied out after passing insects. In 

 flight a rattling sound was often produced by the wings. Their only 

 call was a thin high-pitched note that may be represented as tseet. 



85 See Berlepsch and Hartert, Nov. Zool., vol. 9, April, 1902, p. 34. 



