40 Nelson — North American Mainland 3Ii/iarc/ms. 



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

 Batopilas in western Chihuahua to the Istlimus of Teliuantepec. The 

 specimens from tlie Isthmus and adjacent part of Cliiapas are distinctly 

 intergrades sliowing that inquietus is merely a northern subspecies of 

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

 Cliiapas. 



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

 the Isthmus of Teliuantepec 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 vipper parts and the richer 3'ellow 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 fi-om 

 cinerascens \n size &nA Go\ov almost equally with those from Guerrero. 

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

 of cinerascens, but during the winter a'/ieT-ascews 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. 



SHORT-TAILED FLYCATCHER. 



1887. Myiarchus bracliyurus 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- 



