120 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
Contopus richardsonii peninsulae Brews. 
LARGE-BILLED Woop PEWEE. 
[Pyrocephalus] richardsoni Gray, Hand_list, pt. I. 1869, 362, no. 5,510, part. 
[Contopus virens] var. richardsonii Cours, Key N. Amer. Birds, 1872, 174, part. 
Contopus virens, var. richardsonii Cours, Check List, 1873, 53, no. 255 a, part. 
Contopus richardsoni RipGway, Nom. N. Amer. Birds (Bull. U.S. Nat. Mus., no. 21), 
1881, 31, no. 321, part. 
Contopus virens richardsoni Cougs, Check List, 2d ed., 1882, 70, no. 383, part. 
Contopus richardsonit A. O. U., Check List, 1886, 234, no. 462, part. 
Contopus richardsonii peninsulae BRewsTER, Auk, VIII. 1891, 144, 145 (orig. descr. ; 
types from Sierra de la Laguna and Triunfo). A. O. U. Comm., Auk, IX. 
1892, 106, no. 462a; Check List, 2d ed., 1895, 187, no. 462a. Ripeway, 
Man. N. Amer. Birds, 2d ed., 1896, 598 (descr.; S. Lower Calif.). 
C[ontopus] v.[irens] richardsoni Cours, Key N. Amer. Birds, 4th ed., 1894, 440, part. 
Horizopus richardsonit peninsulae OBERHOLSER, Auk, XVI. 1899, 333 (synonymy). 
[ Contopus virens] var. peninsulae Dupois, Synop. Avium, fasc. IV. 1900, 249 (Basse- 
Californie). 
[ Horizopus] peninsulae SHarpe, Hand-list, III. 1901, 142. 
This near ally of C. richardsonii was discovered by Mr. Frazar on the Sierra 
de la Laguna, where it appeared about the middle of May, the males arriving 
nearly two weeks in advance of the females. It soon became very common, 
frequenting open places in the woods, and usually taking its station at the ex- 
tremity of some dead branch. Its note is “‘a sharp, cutting pee-ee-e, the second 
syllable with a falling, the last with a rising, inflection.” On June 9 while 
descending the mountain Mr. Frazar found these Flycatchers common to its base 
as well as afterwards at Triunfo and San José del Rancho. An adult female 
killed on June 20 at Triunfo was incubating, but no nests were found. 
The Large-billed Wood Pewee has not been reported as yet from anywhere 
outside the Cape Region, but if, as the above evidence indicates, it is a migra- 
tory bird, it must also occur in Mexico and Central America. 
Mr. Bryant records (. richardsonii from San Sebastian and a few localities in 
the northern part of Lower California. 
Empidonax difficilis Barrp. 
WESTERN FLYCATCHER. 
(?) Empidonax diffcilis Brtptne, Proc. U. S. Nat. Mus., V. 1883, 542, part (Cape 
Region); VI. 1883, 348, part (Victoria Mts.). Bryant, Proc. Calif. Acad. 
Sci., 2d ser., II. 1889, 291, part (Cape Region). 
Of true ZL. difficilis I have seen only six Lower California specimens, all of 
which were collected by Mr. Frazar, — one at Santiago on November 15, the 
