2C8 Hasbrouck, Distribution of North American Megascops. [^ July 



Guanajuato, thus making extremely difficult of delineation the 

 distribution in this country. The Mexican Screech Owl is 

 decidedly Lower Sonoran in its affinities, but on the northern 

 border of its range passes into the Upper Sonoran and Transition, 

 while at Cape St. Lucas it has a tinge of the Lower Californian 

 and Tropical life areas. It appears to range to an elevation of 

 about seven thousand feet, Fort Wingate, New Mexico, being 

 the highest known record in the United States. The records are 

 as follows. 



Arizona. Fort Verde. Picacho Station, Casa Grande, Fort Lowell 

 (spec, in U. S. Nat. Mns.) ; Tucson (Rhoads, Proc. Phil. Acad. Nat. Sci. 

 1892, 116); Fort Mojavc (Bull. U. S. Surv. Terr. VI, 1SS1, 241, 242); 

 Bill Williams Fork? Camp r/8 (P. R. R. Surv. X, 1S59, No - 3= 2 °) 5 

 Camp Grant? Gila River 1 (60 m. S. of Apache), San Pedro 1 (Henshaw, 

 Zool. Wheeler Surv. V, 1879, 4°6) i Fort Hnachuca (spec, in U. S. Nat. 

 Mus.); Oracle (Bendire, Special Bull. No. 1, U. S. Nat. Mus. 1892, 36S). 



New Mexico. Fort Wingate (Spec, in U. S. Nat. Mus.). 



Texas. Palo Pinto Co. and Lampasas Co. (spec, in coll. of E. M. 

 Hasbrouck). 



Lower California. Cape St. Lucas (spec, in U. S. Nat. Mus.) ; Cardon 

 Grande and El Rancho Viejo (Bryant, Proc. Cal. Acad. Sci. Ser. 2, II, 

 284) ; Valladares (Anthony) • 



Mexico. Guanajuato (spec, in U. S. Nat. Mus.). 



Megascops asio aikeni Brewst. Aiken's Screech Owl. 



This and the two following forms have been recently described 

 by Mr. Brewster, and while not as yet admitted to subspecific 

 rank, their claim to such appears to rest on sufficiently good basis 

 to warrant their consideration in the present paper. The type 

 specimen now in the Brewster collection was described from El 

 Paso County, Colorado, while a record for '•'•mccallii" from La 

 Plata County I have no hesitation in referring to this race. 



It is questionable if Aiken's Screech Owl occurs at any point 

 north, of Douglas County, Colorado, but it probably inhabits all 

 the more open country along the foothills of the Rocky Moun- 



1 These specimens were originally reported as mccallii. Owing to the fact that the 

 specimens from Bill William's Fork (Camp 118) were subsequently deposited in the 

 National Museum and marked trickopsis, and also to the strides we have made in 

 the knowledge of distribution, I have taken the liberty to change all Arizona records 

 of mccallii to trickopsis. It will be readily seen from the map that it is impossible for 

 mccallii to occur in Arizona. 



