36 JVelson — Korth American Mainland Myiarchus. 



71 uttingi hut they are all females, typically cinerascens in s\ze and general 

 coloration, and occur sporadically practically throughout the range of 

 the species. From the frequency of this variation of the females it ap- 

 pears that there is a tendency toward the extension of the rufous at the 

 expense of the dusky tip of the outer tail feather among them which 

 is not shared equally by the males. While this variation appears to 

 have no geographical significance, yet it evidently, judging from the 

 specimens examined, occurs most frequently in southern Arizona. All 

 of the 105 males examined have the tip of the outer tail feather suf- 

 ficiently typical to enable one to identify them by this character without 

 trouble, although there is considerable variation in the extent of the 

 dusky on the tip. In some cases the feather is entirely rufous on the 

 inner web to within one-fifth of its length from the tip, where the dusky 

 begins next the vane and broadens rapidly intoa narrowband occupying 

 the tip of the feather and sometimes extending down a little along the 

 inner border. In other eases the dusky begins at varying distances along 

 the shaft to within one-third of its length from the base and extends 

 outward in a gradually widening line to occupy the terminal 5 to 15 

 millimeters of the feather and may or may not extend back along the 

 inner edge of the feather sometimes nearly or quite halfway to the base. 

 When the dusky extends back along the inner edge of the feather the 

 outer end of the rufous on this vane forms a narrowing point on the 

 middle of the web. In other specimens it is cut squarely off by the in- 

 ward extension of the dusky near the end of the feather. This variation 

 occvirs throughout the range of the species. 



Myiarchus nuttingi inquietus (Salvin and Godman) replaces M. cineras- 

 cens to the south in Mexico, and the mftteria'l 'ai hisifid appears to show 

 that they are distinct species. 



...>.: :;q '' 

 Myiarchiis tinerascens pertinax (Baird). 



" •> N! r 



CAPE ST. LUCAS FLYCATCHER. 



'J.J i-"U 



1859. Myiarchus pertinax Baird, Proc. Acad. Nat. Sci. .Phila., 1859, p. 

 303. !s V : ■ -i'^i-i . 'rM- tt.!.-:;?'! '■':. 



Type locality . — Cape St. Lucas, '^oWer Cfflllfbrhia. T^ype No. 12,944, 

 U. S. National Museum. 



Breeding range. — Cape regidVi of' Lower Calfornia north at least to 

 Pichilinque Bay. ^N6'^' nlYgratofy..' "' " '' 



Zonal distribution. — Arid I'ropical and border of Lower 'Sonoran. , , , 



Suhspecific characters. — Simi'ikr to cinerascens "but grayer, above' and 

 more whitish below; sii;e smaller; bill larger. , 



Descriptvdn of firW plumage. — Crown warm sepia brown; back hair 



brown; up^er Wil' Coverts 'dull cinnamon rufous; middle pair of tail 



, . if. 

 feathers strongly margined with same; outer webs of rest of tail featliers 



except outer onB^similariytflal'gined; xmV€v w"eb ofoiiler fejtthe'r wfiilisn 



