Nelson — North American Mainland Myiarchus. 33 



Myiarchus mexfcanus magi^ter Ridgway. 



ARIZONA CRESTED FLYCATCHER. 



1884. Myidrchus mexicanus magister Ridgway, Proc. Biol. Soc. Wash., 

 II, p. 90. 



Type locality. — Camp Lowell, near Tucson, Arizona. Type No. 

 86,005, adult male, U. S. National Museum. 



Brccdi/if/ range. — From northwestern Chihuahua and southern Arizona 

 through western Mexico at least to the border of Chiapas. A partial 

 winter migration of northern birds extends as far as Guatemala, but 

 they are resident throughout a large part of their range. 



Zonal dutribiition. — Lower Sonoran and Arid Tropical. 



Snb.specific characters. — Generally similar to and in some cases difficult 

 to distingviish in coloration from pale or faded specimens of true mexicanus, 

 but upper parts averaging grayer and less greenish; throat and breast 

 slightly paler ashy, and abdomen a trifle clearer or brighter yellow; size 

 averages decidelv larger. 



Description of first plumage. — Crown light seal brown; back dark hair 

 brown; upper tail coverts, broad border to outer webs and most of the 

 inner webs of tail feathers dull, dark cinnamon rufous; lesser wing 

 coverts tipped and tertials edged with pale vinaceous-bvitf; greater wing 

 covert's, secondaries and primaries broadly edged with dull rusty rufous, 

 paler than on borders of tail feathers; chiri, throat and' breast pearl gray 

 becoming darkest on breast; abdomen and vmder tail coverts pale prim- 

 rose yellow. 



Measvrements. — Averages of twenty-three adult males: Wing, 108.9 

 (103-114); tail, 100.3 (93-106); culmen, 23.2(22-25); tarsus, 25.4 (24.5-26). 



Averages of fifteen adult females: Wing, 106.7 (100-110); tail, 98.1 

 (9'4-I02); cuimen, 23 (22-25);' tarsus, 25.1 (24-26). 



General Notes,— Su,e is the only character by which magister can be 

 distifig^iished in a great majority of cases. . Specimens from the type 

 reg.iofl in southern Arizopa-^-re considerably larger than those from the 

 more southerly part of their range. Am.on^ the series from various sec- 

 tions of the range, the one from the Tres Marias Island^ averages the 

 smalTes't thus paralleling the relatively smaller size of the series of typi- 

 cal me.r.icunus hova Cozumellsland, off the coast of ^Y^catan. The types 

 of "both "cooperiy and magister, are larger than average bir(|.s of the forms 

 they represent. 



Myiarchus cinerascens (Lawrence). 



ASH-THROATED FLYCATCHER. 



1851. Tyrannula cinerascens Lawrence, Ann. Lye. Nat. Hist. N. Y., 

 V, p. 121. September, 1851. 



Tyjye locality. — Western Texas. 



Breeding range. — From the Dalles, Oregon, Cheyenne, Wyoming, and 



