174 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
Vireo gilvus swainsoni (Barrp). 
WESTERN WARBLING VIREO. 
ireosylvia gilva swainsoni BELDING, Proc. U. S. Nat. Mus., V. 1883, 549 (Miraflores). 
Vireo gilvus swainsoni Bryant, Proc. Calif. Acad. Sci., 2d ser., II. 1889, 307 (Mira- 
flores). 
Although of late denied recognition by many ornithologists, the form 
swainsoni is, in my opinion, a good subspecies. Of the several characters 
which have been claimed for it the best are those relating to the bill, which is 
almost invariably smaller, more depressed, and darker-colored than in true 
gilvus. The Lower California bird does not appear to differ materially from 
that of California, Oregon, and Washington, but all my specimens from the 
Pacific slope north of Mexico are smaller than those from the Rocky Mountains, 
while the latter, in turn, are very decidedly inferior in size to some breeding 
examples in my collection obtained by Mr. Frazar among the Sierra Madre 
Mountains of Chihuahua, Mexico. 
Mr. Frazar found the Western Warbling Vireo common on the Sierra de la 
Laguna in May and early June, and at San Josédel RanchoinJuly. It was less 
numerous at Triunfo, probably because of the scarcity of trees in that locality. 
On La Laguna the birds were paired and apparently about to breed by the 
middle of May, but at San José del Rancho and Triunfo none were found 
nesting until the middle of July. It was an easy matter to discover their 
nests, for the male, like that of our eastern form, is in the habit of singing 
while taking his turn at covering the eggs. 
This Vireo may prove to be resident in the Cape Region, for Mr. Frazar 
shot a male at San José del Rancho on December 23. To the northward it 
has apparently been detected at but two localities on the Peninsula, —Comondu, 
where a single specimen was taken on April 12, 1888, by Mr. Bryant, and San 
Fernando, where Mr. Anthony states that it occurs only during migration, and 
then but rarely.1 
V. g. swainsont is a common summer bird in California and northward to 
British Columbia. It migrates as far southward as the Isthmus of Tehuan- 
tepec. 
Vireo solitarius lucasanus Brewst. 
Sr. Lucas SonitaRy VIREO. 
Vireosylvia solitaria BAirD, Rev. Amer. Birds, pt. I. 1866, 347, 548,.part (Cape St. 
Lucas). 
[ Vireo] solitarius Cours, Key N. Amer. Birds, 1872, 121, 122, part. 
Vireo solitarius Cours, Check List, 1878, 25, no. 127, part. 
1 Auk, XII. 1895, 142. 
