(18) 
SPRING MIGRATION NOTES OF THE CHICAGO AREA 
1913 1914 1915 1916 1917 1918 1919 1920 
7 5 9b. Hermit Thrush Hylocichla guttata pallasi 
Apr. 3 Mar. 2 9 Apr. 5 Mar. 2 5 Mar. 3 0 Apr. 4 Apr. 5 Mar. 27 
Very common migrant. 
7 61. Robin Planesticus migratorius migratorius 
Jan. 18 Mar. 14 Feb. 13 Jan. 2 Feb. 25 Feb. 24 Jan. 16 Mar. 14 
Abundant summer resident; a few winter each year. 
766. Bluebird Sialia sialis sialis 
Mar. 13 Mar. 15 Feb. 13 Feb. 22 Mar. 10 Feb. 24 Mar. 19 Mar. 14 
Common summer resident. 
, APPENDIX 
The following are birds observed only in the fall migration. 
133. Black Duck Anas rubripes 
Dec. 13 
Uncommon migrant, and«winter visitant. 
13 5. Gadwall Chaulelasmus streperus 
Dec. 11 : 
Uncommon migrant; occasionally winters. 
2 58a. Western Willet Catoptrophorus semipalmatus inornatus 
Aug. 5 
Uncommon migrant 
2 7 0. Black-bellied Plover Squatarola squatarola 
Aug. 18 Aug. 31 
Formerly common, now rather rare migrant. 
514. Evening Grosbeak Hesperiphona vespertina vespertina 
Nov. 15 - — 
Rare and irregular winter visitant; common winter 1919-1920. 
^ ^ ^ 
The following are subspecies whose occurrance is doubtful. 
148. Scaup Duck (Marila marila). The Lesser Scaup Duck (Marila affinis) is 
decidedly the more common bird, but the large duck undoubtedly occurs in the 
winter. As positive identification without actual taking of specimens is dif- 
ficult, this species cannot be positively included in the list. 
474. Horned Lark (Otocoris alpestris alpestris). There are undoubtedly winter 
records of this bird in our area. It's subspecies, praticola, is a fairly common 
permanent resident. 
675. Waterthrush (Seiurus novaboracensis novaboracensis) . In all probability 
both forms of the Waterthrush migrate through the area, novaboracensis in the 
early spring, notabilis later. The Grinnel's Waterthrush however, is much com- 
moner. 
72 5d. Prairie Marsh Wren (Telmatodytes palustris iliacus). This form does occur, 
according to Dr. Cory, but palustris is much the commoner. 
7 5 6a. Willow Thrush (Hylocichla fuscescens salicicola). This bird is probably fully 
as common as fuscescens, but they are practically indistinguishable. 
