° 1911 J Hodge, The Passenger Pigeon Investigation. 49 



frequently during the fall than at any other time. It winters rarely in 

 the mountains and quite commonly among the rocky cliffs about Lom- 

 bard. 



194. Hylocichla fuscescens salicicola. Willow Thrush. — Com- 

 mon summer resident in willow thickets in the valleys. It arrives late in 

 May and leaves in August. 



*195. Hylocichla ustulata swainsoni. Olive-backed Thrush.— 

 Common summer resident in the mountains, arriving about June 1 and 

 leaving early in September. Occurs regularly in the valleys during mi- 

 grations. 



196. Hylocichla guttata auduboni. Audubon's Hermit Thrush. 

 — Summer resident in the mountains. Quite rare and usually above 

 7,000 feet. 



*197. Planesticus migratoria propinqua. Western Robin. — 

 Common summer resident, occurring in valleys and mountains up to 

 8,000 feet. This species arrives in the middle of March and leaves late 

 in October. It winters rarely. I observed one at Three Forks, Feb. 12, 

 1910. 



198. Sialia currucoides. Mountain Bluebird.— Common sum- 

 mer resident in the valleys and lower mountain peaks below 6,500 feet. 

 This species arrives early in March and leaves in November. 



THE PASSENGER PIGEON INVESTIGATION. 1 



BY C. F. HODGE. 



At the meeting of this Union a year ago a plan was projected 

 and has since been developed to secure adequate search of the 

 American continent for this lost species. If any consider this a 

 "fool's errand," I may add that at that time I put the question 

 fairly to the Union as a body and to a number of you personally : 

 "Do you think that scientifically adequate search has been made 

 for Ectopistes migratoriusV Not a decisive affirmative answer 

 was offered, and, among others, Dr. C. Hart Merriam replied 

 distinctly that he did not. 



1 Read at the meeting of the American Ornithologists' Union held in Washing- 

 ton, D. C, Nov. 14-17, 1910. 



