262 Trans. Acad. Sci. of St. Louis. 



third and fourth weeks of the month, and the last do not leave 

 our most southern woods before the middle of October. While 

 they are musical in spring, they are silent in fall and therefore 

 easily overlooked, but may be found wherever there are plenty 

 of wild grapes, hackberry, sour gum, and other wild fruit. 



[757a. Hylocichla aliciae bicknelli Ridgw. Bicknell's 

 Thrush.] 



Turdus aliciae bicknelli. 



Geog. Dist. — Breeds in mountainous parts of northeastern 

 states and Nova Scotia. 



Has been taken several times at Warsaw, III, by Mr. Chas. 

 K. Worthen; the first time. May 24, 1884, and identification 

 verified by Mr. R. Ridgway himself (Natural History Survey 

 of Illinois, vol. 1, page 59). Mr. Worthen thinks that it will 

 undoubtedly be found in company with Gray-cheeked Thrushes 

 on wooded islands in the Mississippi while migrating in April 

 and May. 



758a. Hylocichla ustulata swainsonii (Cab.). OHve-backed 

 Thrush. 



Turdus swainsonii. Turdus ustulatv^ swainsonii. Swainson's Thrush. 



Geog. Dist. — Not considering the lately differentiated sub- 

 species oedica and almae the Swainson's Thrush ranges over 

 Eastern North America and westward to the upper Columbia 

 River, straggling to the Pacific coast into the domain of the other 

 subspecies ustidata. Breeds from the mountainous parts of 

 the eastern states and from Mackinac Island north to Newfound- 

 land, Gulf of St. Lawrence, Hudson Bay and through the Sas- 

 katchewan region to Mackenzie and westward to British Colum- 

 bia, rarely to Alaska. In winter to Cuba, and through Central 

 America to Colombia, Ecuador and Peru. 



In Missouri a common and most regular transient visitant 

 spring and fall, west as well as east. In some springs the first 

 are seen in southern Missouri soon after the middle of April, but 

 the cold and windy weather which we often have about this time 

 keeps them from advancing farther until the last days of the 

 month, when they usually appear in the vicinity of St. Louis 

 (April 26, 1883, 1884). The bulk is always present between 

 May 3 and 15, after which their numbers decrease more or less 

 rapidly according to the weather, the last being noted in the 



