336 BULLETIN 133, UNITED STATES NATIONAL MUSEUM 



whit iiihir-r-r-r whit. The species was recorded west to Kilometer 



200. 



MYIARCHUS SORDIDUS Todd 



Mylarchus sordidus Todd, Proc. Biol. Soc. Washington, vol. 29, June 6, 

 1916, p. 96. (EI Trompillo, Carabobo, Venezuela.) 



An adult male secured near San Vicente, in extreme eastern Uru- 

 guay, January 81, 1921, is listed under sordidiis with reservation. 

 Todd, in his review of the o-enus Myiarchus^^^ examined this bird 

 and marked it '"'' Myiarchus sp. (near sordidus).'''' After study and 

 comparison with Todd's revision of the genus it appears that the 

 specimen shows the characters of darker dorsal surface that dis- 

 tinguish sordidus from pelzelni., and under present understanding 

 of the group it can be listed only as sordidus. It may be noted that 

 Todd ^^ records sordidus from Rio Grande do Sul, so that eastern 

 Uruguay is not a remarkable extension of range, especially since 

 other south Brazilian species were obtained at the same point. 



The bird was shot in heavy brush bordering the Laguna Castillos. 



MYIARCHUS PELZELNI Berlepsch 



Myiarchus pelzelni Berlepsch, Ibis, 1883, p. 139. (Baliia, Brazil.) 



The present species was found near Victorica, Pampa, where an 

 adult female was secured December 24, 1920, and an adult male and 

 a young female December 27. The adult male is much grayer above 

 than the female and has little yellow below. The young bird, not 

 yet fully feathered, is yellower on the abdomen, and has rectrices 

 and remiges margined with cinnamon. 



The birds were found in heavy growth of the semiarid, open 

 forest of low, thick-trunked trees characteristic of this region, where 

 they were located through their low-pitched mournful whistled 

 calls. 



MYIARCHUS FEROX SWAINSONI Cabanis and Heine 



Myiarchus swainsoni Cabanis and Heine, Mus. Hein., pt. 2, 1859, p. 72. 

 (Brazil.) 



The present bird resembles M. t. tyrminulus superficially, but has 

 a smaller bill and lacks the rufescent coloring in the tail. The bird 

 was recorded at Resistencia, Chaco, July 8, 1920 (male taken) ; Las 

 Palmas, Chaco, July 17 to 31 (two males July 17 to 21) ; and Tapia, 

 Tucuman, April 8 to 13, 1921 (male shot April 8). They were 

 found in open woods in fair numbers. In feeding they hopped 

 easily about among twigs and leaves, snatching at insects, and occa- 

 sionally resting stationary for a time. 



""See Proc. Biol. Soc. Washington, vol. 35, Oct. 17, 1922, pp. 181-218. 

 =° Idem, p. 197. 



