Nelson North American Mainland Myiarchus. 49 



Myiarchus lawrencei tresmariae subsp. nov. 



TRES MARIAS FLYCATCHER. 



Type. No. 156,810, adult male, U. S. National Museum, Biological 

 Survey Collection. From Maria Madre Island, Tepic, Mexico. Collected 

 May 5, 1897, by E. W. Nelson and E. A. Goldman. 



Breeding range. Tres Marias Islands, Tepic Ty., Mexico. Not mi 

 gratory. 



Zonal distribution. Arid Tropical. 



Subspecific characters. Palest and grayest of the forms of lawrencei, 

 with slight buffy borders on inner webs of inner tail feathers; bill pro 

 portionately longer and broader than in olivascens. 



Description of slightly worn plumage. Upperparts hair brown, only 

 slightly darker on crown; upper tail coverts drab thinly edged with pale 

 cinnamon; tail feathers thinly edged externally with same; inner pri 

 maries and secondaries very finely edged externally with same; wing 

 coverts tipped with drab; chin, throat and breast dingy ash gray, duller 

 than in olivascens; abdomen and under tail coverts straw yellow; inner 

 webs of inner tail feathers usually with narrow border of buffy ; bill 

 larger and broader than in olivascens. 



Measurements. Adult male (type); Wing, 79; tail, 75; culmen, 18; 

 width of culmen, 9; tarsus, 21. 



Average of seven adult females: Wing, 76.1 (73-30); tail, 74.4 (70-79). 

 culmen, 16.8 (16-18); width of culmen, 9.1 (9-9.5); tarsus, 19.6(19-20.5); 



General notes. The present form only needs comparison with olivas 

 cens, from which it is easily distinguished by the characters mentioned. 



Myiarchus nigriceps Sclater. 



BLACK CROWNED FLYCATCHER. 



1860. Myiarchus nigriceps Sclater, Proc. Zool. Soc. London, 1860, p. 68. 



Type locality. Pallatanga, Ecuador. Type in British Museum. 



Breeding range. Over a large part of northern South America from 

 the valley of the Amazon to Panama (including San Miguel Island). 

 Not migratory. 



Zonal distribution. Mainly Humid Tropical but ranging above this 

 to 9500 feet in Peru (Biologia Cent. -Am., II, p. 96). 



Specific characters. Crown slaty black; back olive greenish; wings 

 and tail of adult without rufous edgings. 



Description of fresh plumage. Crown slaty black; back olive greenish; 

 upper tail coverts hair brown slightly edged with tawny olive; tail 

 feathers edged externally with hair brown varying to isabella color; 

 outer web of outer feather drab, paler than inner web; inner webs plain 

 dusky; outer primaries without external edging; inner primaries with 



