Western Robin 523. 
quickly completed ; one begun on June 6th was finished 
on the 13th, and the first clutch of eggs laid by the 18th. 
The eggs, nearly always four in number, are bright 
greenish-blue, and unspotted, and average about ‘90 x ‘67. 
This bird generally returns to the same spot every 
year, sometimes repairing an old nest, sometimes build- 
ing a fresh one close by. Gale also found a very large- 
number of deserted nests, sometimes with a full com- 
plement of eggs. He believed that some of these were 
due to the mischievous proclivities of Jays, but he also 
suggested that, as the bird is a rather late migrant and. 
the females arrive first, it was perhaps possible that 
they at once set to work to build nests and lay sterile 
eggs, and that after the arrival of the males fresh nests 
were made and the sterile eggs deserted. Gale found fresh 
eggs between June 10th and July 10th, and his obser- 
vations agree very well with those of other naturalists. 
Genus PLANESTICUS. 
Rather large Thrushes resembling Hylocichla, but with a longer: 
tail, which is always more than three times the length of the tarsus, 
and with the lower parts not spotted though the throat is streaked. 
A large genus of nearly cosmopolitan distribution, with one species 
in the United States separated into an eastern and western subspecific 
form. The eastern race has a distinct white tip to the outer tail- 
feather, absent in the western race. The Colorado Robins are many 
of them somewhat intermediate in character, but on the whole seem 
closer to the western subspecies. 
Western Robin. Planesticus migratorius propinquus. 
A.O.U. Checklist no 76la—Colorado Records—Say 23, Vol., ii., 
p. 17; Allen 72, pp. 147, 155, 161, 173 ; Aiken 72, p. 193; Trippe 74, 
p. 228 ; Henshaw 75, p. 143; Scott 79, p. 91; Tresz 81, p. 282 ; Drew 
81, p. 85 ; 85, p. 15; Allen & Brewster 83, p. 152 ; Beckham 85, p. 140; 
87, p. 125; Morrison 86, p. 153; 88, p. 70; Kellogg 90, p. 90; Lowe 
94, p. 270; McGregor 97, p. 39 ; Cooke 97, pp. 18, 126, 223 ; Keyser: 
02, p. 31; Dille 03, p. 74; Henderson 03, p. 237; 09, p. 242 ; Warren 
06, p. 24 ; 08, p. 26 ; 09, p. 17 ; Gilman 07, p. 195 ; Markman 07, p. 158 ; 
Rockwell 08, p. 180; Bergtold 09, p. 196. 
