BIRDS OF NORTH AND MIDDLE AMERICA. 571 



ff. Under parts mostly or largely pale bufty cinnamon (sometimes whitish 

 on throat and abdomen); feet stouter; upper parts browner; wing 

 relatively longer, tail shorter (averaging more than 50 and less than 

 38, respectively, in adult male) . ( Troglodytes musculus. ) 

 g. Paler, the under parts distinctly whitish on throat and abdomen; 

 larger (adult male averaging, wing 54, tail 37.6, exposed culmen 14.4, 

 tarsus 19.7; adult female, wing 53.5, tail 38.5, exposed culmen 

 14.5, tarsus 19.7). (Isthmus of Panama, north to Chiriqui.) 

 Troglodytes muaculns iuquietus (p. 575 )« 

 gg. Darker, the under parts almost entirely pale to deep buffy cinna- 

 mon; smaller (measurements averaging decidedly less than the 

 above). 

 /(. Larger (with relatively shorter tail) and slightly paler in color; 

 adult male averaging, wing 51.1, tail 36.3, exposed culmen 13.2, 

 tarsus 18.7; adult female, wing 47.8, tail 33.5, exposed culmen 

 13.5, tarsus 17.8. (Costa Rica to southern Honduras. ) 



Troglodytes muscalns iutermedius (p. 576) 



hh. Smaller (with relatively longer tail) and slightly deeper in color; 



adult male averaging, wing 48.6, tail 37, exposed culmen 12.9, 



tarsus.l8; adult female, wing 48, tail 36.8, exposed culmen 12.3, 



tarsus 18. (Southern Mexico to Guatemala.) 



Troglodytes muscTilus hypaedon (p. 578) 

 ee. Tail relatively longer (five-sixths as long as wing, or more, 38-50, averag- 

 ing more than 40) ; under tail-coverts with ground color mostly white. 

 ( Troglodytes aedon. ) 

 /. Browner above, the back rarely barred with dusky. (Eastern United 

 States, south to southern Tamaulipas in winter. ) 



Troglodytes aedon aedon (p. 579) 

 ff. Grayer above, the back usually barred with dusky. (Central and 

 western temparate North America and greater part of Mexico. ) 



Troglodytes aedon parkmanii (p. 582) 



66. Superciliary stripe distinct; throat and chest distinctly cinnamon or cinnamon- 

 buff; flanks distinctly barred (excepj.in young). 

 c. Feathers of rump with concealed spots of white; ground color of tail brown. 

 ( Troglodytes brunneicollis. ) 

 d. Deeper colored, the throat and chest decidedly cinnamomeous, the upper 

 parts browner. 

 e. Cinnamon of under parts paler, the lower abdomen more or less exten- 

 sively whitish. (Southern Mexico, from States of Guerrero and Oaxaca 

 northward to San Luis Potosi, Mexico, and Zacatecas.) 



Troglodytes brunneicollis brunneicollis (p. 586) 



ee. Cinnamon of under parts deeper, covering whole abdomen. (Mount 



Zempoaltepec, Oaxaca.) Troglodytes brunneicollis nitidus (p. 588) 



«Not having the time to study the South American relatives of this form, I fol- 

 low Mr. Oberholser in reducing T. inquietus, T. intermedius, and T. hypaedon to the 

 rank of subspecies of T. musculus; nevertheless, I have received the impression, from 

 comparison of scant material it is true, that Mr. Oberholser has gone too far in reduc- 

 ing the number of specific types, and that a better arrangement would be to consider 

 T. inquietus as a subspecies of T. striatulus, and T. intermedius as specifically distinct 

 (I have not been able to find intermediates). The nomenclature of the Central 

 American forms would according to this arrangement be as follows: T. striatulus 

 inquietus, T. intermedius intermedius, and T. intermedius hypaedon. See Oberholser, 

 Proc. U. S. Nat. Mus., xxvii, no. 1354, 1904, pp. 197-210. 



