254 THE AMERICAN MIDLAND NATURALIST. 
summer resident. It arrives as early as the first of April, but 
usually about April 10. Nests have not been observed, but the 
species is regularly seen throughout the summer. 
224. Hylochichla alicae alicae (Baird.) Gray-cheeked 
Thrush. An uncommon or rare migrant, arriving in the first 
week of May. 
225. Hylochichla astulata swainsoni (Cab.) Olive-Backed 
Thrush. Tolerably common to uncommon migrant, arriving 
April 2 to 12. 
226. Hylochichla guttata pallasi (Cab.) Hermit Thrush. 
-This is the commonest of the Thrushes of the district, par- 
ticularly during migration. Arrival ranges from March 24. 
to April 11, with the migration reaching its maximum about — 
the middle of April. It is very common along the Cedar River, 
both north and south of Charles City, and follows the stream 
for some miles. 
227. Plaesticus migratorius migratorius (Linn.) Robin. 
The Robin is an abundant summer resident throughout the 
region, and an occasional winter resident in Floyd County. 
It arrives in late February or early March, and remains until 
late October or early November. Webster states that he has 
several times known it to remain throughout the winter. 
December 23, 1918, Mrs. J. M. Ferguson reported it from 
Caldwell, a station some four miles north of Charles City, and 
on December 27 of the same year I saw two individuals east 
of Charles City. W. T. Swartz states that in January, 1916, 
he saw a flock of six birds in the grounds of the McKinley 
school, Charles City. 
228. Sialia sialis (Linn.) Bluebird. Abundant migrant 
and summer resident, arriving in late February or early 
March, and remaining until the first week of November. 
Nests are usually built in old woodpecker holes, and eggs laid 
in the first week of June. 
INTRODUCED SPECIES. 
229. Phasianus torquatus (Gmel.) Ring-necked Pheasant. 
Several pairs of these birds have been placed in the Waller 
Woods, which is leased by the state as a game preserve. They 
