92 PACIFIC COAST AVIFAUNA No. 11 
the Sierra Nevada. Breeding birds from Santa Rosa, Santa Cruz, San Clemente 
and Santa Catalina islands have been referred to a separate species, insulicola 
(Oberholser, Auk, xiv, 1897, p. 300), but apparently without adequate reason 
(see J. Grinnell, Condor, vim, 1906, p. 74). Summer birds from the Cuyamaca 
Mountains, San Diego County have been called by the same name, cineritius, as 
the form from southern Lower California. This does not seem to express the 
facts, for several breeding birds at hand from the Cuyamaca region show no 
characters outside the range of variation among more northern examples of 
dif ficils. 
276 (466) °* Empidonax trailli trailli (Audubon) 
TRAILL FLYCATCHER 
Synonyms—Tyrannula trailli; Myiobius pusilla; Empidonar pusillus ; Em- 
pidonaz trailli var. pusillus; Little Flycatcher. 
Status—Summer visitant to suitable portions of Lower and Upper Sonoran 
yones and rarely low Transition, both east and west of the Sierran divide. Most 
numerous in the willow tracts in the beds of large valleys. Breeds along 
streams well into the foot-hill regions, but apparently seldom above the limits of 
Upper Sonoran. Northernmost summer record east of the Sierras: Goose Lake, 
Modoe County (Mus. Vert. Zool.) ; breeds sparingly in the Inyo region (A. K. 
Fisher, N. Amer. Fauna no. 7, 1893, p. 65). Northernmost record west of the 
Sierra Nevada: Scott River, Siskiyou County (Mus. Vert. Zool.). Breeds south 
to base of Cuyamaca Mountains, San Diego County (Anthony, Auk, xm, 1895, p. 
390). Widely spread over the lowlands of the state generally, during spring 
migration; in the return migration which begins in midsummer this flycatcher 
like many other insectivorous birds invades the higher mountans, even to the 
Canadian zone, which fact has probably led to the erroneous recording of the 
species as a breeding bird above its real breeding range. 
277 (468) Empidonax hammondi (Xantus) 
HamMonpb FLYCATCHER 
Synonym—Tyrannula hammondi. 
Status—Common spring transient through the valleys of southern and cen- 
tral California; less common in the fall, occurring in the mountains as well as 
the lowlands. Passes in migration both east and west of the Sierras, but not 
through the coast belt north of Monterey County; in fact the only unquestioned 
record for the northwestern section of the state, north of Monterey and west of 
Mount Shasta, is Cotati, Sonoma County, April 21 (Mailliard ecoll.). Of the 
many records of the breeding of this species along the Sierras, not one has been 
authenticated, though a few remain untested. At any rate, I am confident that 
all breeding records from southern California, and central California west of 
the Sierras, are erroneous—most emphatically those from the San Jacinto and 
San Bernardino mountains.” In these and doubtless most other cases E. griseus 
or E. wrighti was mistaken for it. Breeding of 2ammondi in the high central 
and northern Sierras is not improbable, but the records to this effect need veri- 
fication. 
