EMPIDONAX OBSCURUS, WRIGHT's FLYCATCHER. 259 



of this species, and being nearer to it than to any other form found in 

 this region, may properly be referred to it. On the plains E. imsUlus 

 was met with in small numbers in June, but not observed elsewhere. 

 It will be seen that four diflerent species or varieties of Unipidonax, are 

 found in the same region within a short distance ; one, obscurus, breed- 

 ing from 7,000 or 7,500 feet up to timber-line, or nearly to it ; another, 

 difficilis, from the plains up to the lower limit of the former, and some- 

 times straggling higher ; a third, pusillus, restricted entirely to the 

 plains ; and a fourth, hammondii, occurring, probably, only as a strag- 

 gler. All these varieties are much alike in their habits and notes, yet 

 all present distinguishing characteristics in both ; and although among 

 a large series of specimens some will be found that are intermediate, 

 apparently, the greater number of adults can be referred with certainty 

 to one or the other of the type forms." 



To complete an account of the North American small olivaceous Flycatchers, all of 

 which, with these exceptions, have been given, I introduce the following species, par- 

 ticularly as I think they may yet be found in the southwestern part of the Missouri 

 region : 



Empidonax fulvifrons var. pallescens, Coues. 



a. fulvifrons. 



Muscimpa fidvifrons, GiR., 16 Sp. Texas B. 1841, pi. 2 (probably Mexico). 

 Empidonax fulvifrons, ScL., P. Z. S. 1858, 301. 



Mitrephorus fulvifrons, SCL,, P. Z. S., 1859, 45 ; Ibis, 1859, 442.— B. B. & R., N. A.B. ii, 385, 

 Empidonax rnUcundus, Cab., Mus. Heiu. ii, 1859, 70. 



b. pallescens. 



(??) Tfirannnla afflnis, Sw., Phil. Mag. i, 1827, 336 (very uncertain). 

 Empidonax pygmceus, Coues, Ibis, 1865 (in text). 



Mitrephorus pallescens, Coues, Pr. Phila. Acad. 1866, 63 (Arizona). — CoOP., B. Cal. i, 386. 

 Mitrephorus fulvifrons, Elliot, B. N. A. i, pi. 19. 



Mitrephorus fulvifrons var. jwJlescens, CoUES, Key, 1872, 176. — B. B. Si, R., N. A. B. ii, 

 1874, 386, pi. 44, fig. 13. 



Hal). — Mexico. North into Arizona and New Mexico. 



CONTOPUS PERTINAX, Cah. 



Contopus horealis, ScL., P. Z. S. 1858, 301 ; 1859, 43 ; Ibis, i, 1859, 122, 440 {nee Bd.). 



Contopus pertinax, Cab., Mus Hein. ii, 1859, 72.— ScL., Cat. 1862, 231.— CouES, Pr. Phila. 

 Acad. 1866, 60 (first introduced to United States; Fort Whipple, Arizona). — 

 Elliot, B. N. A. i, pi. 8.— Coop., B. Cal. i, 1870, 324.— Coues, Key, 1872, 173.— 

 B. B. & R., N. A. B. ii, 1874, 356, pi. 44, f. 2. 



Hah. — Mexico and Guatemala. North into Arizona and New Mexico. (Mr. H. W. 

 Henshaw recently took quite a number of both these species in Arizona.) 



