60 



BULLETIN 50, UNITED STATES NATIONAL MUSEUM, 



on upper throat, abdomen, and under tail-coverts) with dull black, 

 the blackish spots or bars broadest, and somewhat crescentic, on 

 chest; a broad blackish submalar streak along each side of upper 

 throat. 



Adult male.— Length (skins), 152-185 (172); wing, 99-109 (104); 

 tail, 65-78.5 (73); exposed culmen, 13-15 (14.2); tarsus, 28-32.5 

 (30.3); middle toe, 15.5-18.5 (17.4).« 



Adult female.— Length (skins), 157-176 (166); wing, 97-107.5 

 (100); tail, 63-77 (67.7); exposed culmen, 12.5-14.5 (13.6); tarsus, 

 27-31.5 (29.8); middle toe, 15-17.5 (16.3).^ 



Eastern and northern North America; breeding from Newfound- 

 land (Canada Bay), Magdalen Islands?, Labrador, Ungava (Fort 

 Chimo), and Keewatin (York Factory; Fort Churchill; Repulse Bay) 

 to Mackenzie (Anderson River ; Wilmot-Horton River ; Repulse Bay), 

 Alaska (except portion south and east of Cross Sound), and north- 

 eastern Siberia (Cape Tschukotsk; Pitlekaj); migrating southward 

 through eastern United States (west to eastern Montana) to Cuba, 

 Santo Domingo, Cozumel Island, Ruatan Island, Costa Rica (San 

 Jose, etc.), Panama (Volcan de Chiriqui), Colombia (Bonda, etc., 

 Santa Marta), Ecuador (Machay), Peru (Chamicuros), Venezuela, 

 (Quiribana de Caicara; Maipures; Nicare; La Pricion), and British 

 Guiana (Bartica Grove ; Camacusa) ; accidental in Greenland and 

 Heligoland. 



(?) Tia-dus fuscus (preoccupied ?) c Gmelin, Syst. Nat., i, pt. ii, 1788, 817 (New 

 York; based on Brown Thrush Pennant, Arct. Zool., ii, 337; Latham, Synop. 

 Birds, ii, pt. i, 28). 



« Twenty-seven specimens. 

 b Twenty-one specimens. 



Specimens from different geographic areas compare in average measurements as 

 follows: 



Locality. 



Wing. Tail. 



Ex- 

 posed Tarsus, 

 culmen. 



Middle 

 toe. 



MALES. 



Ten adult males from Atlantic coast district 



Six adult males from Mississippi Vallej' 



Eleven adult males from Alaska 



Ten adult males of H. a. biclcnelli 



FEMALES. 



Eight adult females from Atlantic coast district 



Eight adult females from Mississippi Valley 



Five adult females from Alaska 



Eight adult females of H. a. bicknelli 



30.8 

 29.9 

 30 

 28.5 



29.6 

 29.1 

 29.5 

 29 



17.4 

 16.9 

 16.6 

 16.1 



16.6 

 16.1 

 16.2 

 16.4 



t'Mr. Seel)ohm (Cat. Birds Brit. Mus., v, 201, footnote) says: "Coues, in his 'Birds 

 of the Colorado Valley' (p. 34), states that the name given by Gmelin had been previ- 

 ously applied to another species; but I have been unable to discover any such 

 application." 



