40 Nelson North American Mainland Myiarchus. 



tive characters," it is a common resident of western Mexico from 

 Batopilas in western Chihuahua to the Isthmus of Tehuantepec. The 

 specimens from the Isthmus and adjacent part of Chiapas are distinctly 

 intergrades showing that inquietus is merely a northern subspecies of 

 Myiarchus nuttingi, which latter does not appear to range north of 

 Chiapas. 



Nine specimens, representing both sexes, from the Pacific Coast of 

 the Isthmus of Tehuantepec and thence to the border of Chiapas, have 

 the brown line along the inside of the shaft of the outer tail feather con 

 siderably reduced, often to half or less the amount found in typical birds. 

 They are also rather smaller than typical birds and their color is other 

 wise like that of nuttingi, This combination of exactly intermediate 

 characters in the birds of this section with the occurence of undoubted 

 nuttingi a little farther down in Chiapas and Guatemala appears suf 

 ficiently conclusive evidence to warrant placing inquietus as a subspecies 

 of nuttingi. In general coloration these two forms appear to be practi 

 cally identical so that they are to be separated only by size and pattern 

 of color on the outer tail feathers. 



M. n. inquietus is intermediate in size between nuttingi and cinerascens 

 and there is a close resemblance in the color of the upper parts of 

 slightly faded specimens of inquietus and cinerascens. In freshly as 

 sumed fall plumage the upper parts of both these species are darker 

 than at any other time. At such times inquietus may be distinguished 

 by its darker and browner upper parts and the richer yellow of the ab 

 domen as well as by the tail pattern. 



A careful examination of the large series of inquietus and cinerascens 

 now available has failed to reveal any evidence of intergradation. Birds 

 from the river valleys of western Chihuahua and Sonora differ from 

 cinerascens in size and color almost equally with those from Guerrero. 

 The breeding range of M. inquietus appears to be complementary to that 

 of cinerascens, but during the winter cinerascens migrates over the range 

 of inquietus. 



These two birds have evidently been confused by different authors 

 under the name of cinerascens so that without the specimens for verifi 

 cation it will be impossible to satifactorily place some of the winter cita 

 tions for western and southern Mexico. Summer records within the 

 demonstrated range of either can be more readily handled. 



Myiarchus brachyurus Ridgway. 



SHOUT-TAILED FLYCATCHER. 



1887. Myiarchus brac7iyurus Ridgway, Man. N. Am. Birds, p. 334. 



Type locality. Ometepe, Nicaragua. Type No. 91,057, U. S. National 

 Museum. 



Breeding range. Costa Rica (San Lucas, Bahia de Salinas) ; Nicara- 



