406 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I50 



Definite specimen records for Panama are as follows : 



Los Santos : Guanico Arriba, Jan. 25, 1962. 



Canal Zone : Lion Hill, May 1 ; Rio Indio, near Gatun, Feb. 8, 1911. 



Col6n: Portobelo, May 23, 1911. 



San Blas : Mandinga, Jan. 31, 1957. 



Dari6n : Jaque, Mar. 17 and 27, 1946. 



CATOPTROPHORUS SEMIPALMATUS INORNATUS (Brewster): Willet; 



Playero Aliblanco 



Symphemia semipalmata inornata Brewster, Auk, vol. 4, no. 2, Apr. 1887, p. 

 145. (Larimer County, Colorado.) 



Large ; gray above, white underneath, with a striking black and 

 white pattern in the wing in flight. 



Description. — Length, 340 to 355 mm. Breeding dress, above 

 slightly brownish gray ; crown and hindneck streaked, back and scap- 

 ulars, spotted and barred, with dusky ; wing coverts nearly plain ; pri- 

 maries white for basal half, rest dusky black; secondaries white; tail 

 mottled with darker gray ; underparts white, with f oreneck and upper 

 breast spotted, and sides barred, with dusky ; axillars and under wing 

 coverts sooty black. 



Winter plumage, above light brownish gray ; underneath white 

 shaded on sides, and in some individuals on front of foreneck with 

 pale gray ; wings as in breeding dress. 



Measurements (from Ridgway, 1. c, p. 319). — Males, wing 193- 

 218 (205.2), tail 73-84.5 (79.4), culmen 58-63.5 (59.4), tarsus 57-69 

 (64.9) mm. 



Females, wing 209.5-220 (213.5), tail 74-88 (80.9), culmen 63-65 

 (64.1), tarsus 66.5-70 (68.3) mm. 



Migrant from the north. Common along the Pacific coast; rare 

 on the Caribbean side ; Isla Coiba ; Isla Cebaco ; Isla del Rey, Isla San 

 Jose. Common from August to April, with numbers of nonbreeding 

 birds remaining through the period of northern summer. All of the 

 hundreds that I have seen have been in plain plumage, with none in 

 barred breeding dress. 



T. A. Imhof recorded in his unpublished notes that he saw 35 at 

 Panama Viejo on June 20, 1942, and Eisenmann (Wilson Bull., vol. 

 63, 1951, p. 182) from 1948 to 1951 found them here from the latter 

 half of June to the first half of July, with 23 as the maximum number 

 at one time. In 1953 I recorded a dozen at Playa Coronado on June 

 19, and 3 at Nueva Gorgona on June 23. 



Willets are found scattered singly or gathered in small bands on 

 sandy beaches and on the mud flats at the mouths of the larger rivers. 



