BIEDS OP NOETH AND MIDDLE AMEEIOA. 481 



Range. — Temperate parts of continental America, from Manitoba 

 to Patagonia. 



KEY TO THE SPECIES AND SUBSPECIES OF CISTOTHORUS. « 



a. Pileum distinctly streaked. 

 6. No distinct superciliary stripe, the whole side of head being dull whitish, nar- 

 rowly streaked with darker; rump immaculate, or else much less conspicu- 

 ously streaked than back, 

 c. Eump streaked or spotted with black and white; wing longer, tail, bill, tarsi, 

 and toes shorter (adult male averaging wing 45, tail 38.6, exposed culmen 

 10.5, tarsus 16.8, middle toe 11.2) . (Eastern North America.) 



Cistothorus stellaria (p. 482) 

 cc. Eump immaculate brown; wing shorter, tail, bill, tarsi, and toes longer (adult 

 male averaging wing 42.5, tail 40.2, culmen 11, tarsus 18, middle toe, 12.5). 

 ( C'istothorus polyglottus. ) 

 d. Darker, with whitish streaks on back narrower. (Brazil, etc. ) 



Cistothorus polyglottus polyglottus (extralimital)* 

 dd. Paler, with white streaks on back broader. 

 e. More rufescent above, with white streaks on back broader; tail longer 

 (44 in male). (Isthmus of Panama. ) 



Cistotliortis polyglottus luoidus, adult (p. 486) 

 ee. Grayer above, with white streaks on back narrower; tail shorter (38-42 

 in male). (Eastern Mexico to Guatemala.) 



Cistotliorns polyglottus elegans, adult (p. 484) 

 6. A distinct superciliary stripe of pale brownish buff or buffy white; rump very 

 heavily streaked or blotched with black and streaked with whitish. (South- 

 ern Brazil to Chile, Patagonia, and Falkland Islands. ) 



Cistothorus platensia (extralimital)" 

 aa. Pileum plain brown. 



5. Smaller (wing not more than 43) ; no superciliary stripe. 



c. Pileum and hindneck light bistre; rump and upper tail-coverts deep rus- 

 set-brown; flanks and under tail-coverts deep cinnamon-buff. 



Cistothorus polyglottus luoidus, young'^ (p. 486) 



« Only those forms which I have been able to examine in the present connection 

 are included. 



iThryothorus polyglottus Vieillot, Nouv. Diet. d'Hist. Nat., xxxiv, 1819, 59 (Para- 

 guay; based on Todo voz Azara, Apunt., ii, 29). — Cistothorus polyglottus Pelzeln, Orn. 

 Bras., 1871, 48, 414; Salvin and Godman, Biol. Centr.-Am., Aves, i, 1880, 105, part 

 (Brazil, Paraguay); Sharpe, Cat. Birds Brit. Mus., vi, 1881, 245, part. — Troglodytes 

 omnisonus Naumann, Vog. Deutschl., iii, 1823, tab. to p. 724 (ex Lichtenstein, manu- 

 script; based on Todo voz Azara, Apunt., ii, 29). — (?) Turdus interscapularis Nord- 

 mann, in Erman's Verz. Thiere. Pflanz., 1835, 13 (Brazil). — Clistothorus} interscapu- 

 laris Cabanis, Mus. Hein., i, 1850, 78, footnote. 



c [Sylvia} platensis Latham, Index Orn., ii, 1790, 548 (based on Roitelet de 

 Buenos Ayres Buffon, Hist. Nat. Ois., v, 361; PI. Enl., pi. 730, fig. 2); Hylemathrous 

 platensis Maximilian, Beitr. Naturg. Bras., iii, 1831, 742; Thryothorus platensis Hart- 

 laub. Index Azara's Apunt., 10; Pelzeln, Orn. Bras., 1871, 48, 414; Cistothorus pla- 

 tensis Sclater, Proc. Zool. Soc. Lond., 1860, 384; Sharpe, Cat. Birds Brit. Mus., vi, 

 1881, 244. — Tlhryothorusl eidouxi Bonaparte, Consp. Av., i, 1850, 221 (Brazil; baaed 

 on Voy. Pole Sud., Ois., pi. 19, flg. 6). — Cistothorus fasdolatus Burmeister, Journ. fiir 

 Orn., 1860, 252. 



<^The young of other forms of the genus not seen by me. 



10384— VOL 3—03 31 



