392 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I50 



Possibly resident. Status uncertain from present information; 

 recorded on the Caribbean coast of western Colon, Canal Zone, and 

 San Bias. 



At Mandinga, San Bias, on February 6, 1957, I found half a 

 dozen Wilson's plovers on a sand bar at the mouth of the Rio 

 Mandinga and collected two females. These prove to be the typical 

 subspecies, not previously reported for the republic. A pair recorded 

 on February 10, 1952, near Boca del Rio Indio, in the western sector 

 of Colon, I believe to have been the eastern race, but this is not 

 certain as I did not obtain one for a specimen. They were on a 

 sand beach at the mouth of a small stream about 3 kilometers east 

 of the village, and at my approach ran aside to hide, as they do 

 when on their nesting grounds. They have been recorded breeding 

 on Grassy Key off the coast of British Honduras but are little 

 known south of that point. 



The only other report for these birds on the Caribbean side of the 

 Isthmus is a sight record by Arbib and Loetscher (Auk, 1935, p. 

 326) of 21 on August 23, 1934 at the spillway on the Chagres at 

 Gatun. 



CHARADRIUS WILSONIA BELDINGI (Ridgway) 



Pagolla wilsonia beldingi Ridgwaj', U. S. Nat. Mus. Bull. SO, pt. 8, June 26, 

 1919, p. 112. (La Paz, Baja California.) 



Characters. — Darker gray on the dorsal surface ; middle toe shorter, 

 17-18mm., or less. 



Measurements (from Ridgway, I.e., p. 112). — Males, wing 115-116 

 (115.5), tail 45-48.5 (46.7), culmen 19.5-20.5 (20), tarsus 27.5-28 

 (27.7), middle toe without claw 17-18 (17.5) mm. 



Females, wing 113.5-119 (115.5), tail 45-49.5 (47.2), culmen 

 19.5-21.5 (20.7), tarsus 27-29 (28), middle toe without claw 17.5- 

 18.0 (17.8) mm. 



Probably resident. Local in occurrence on the Pacific coast ; 

 recorded from Los Santos (La Honda) ; Canal Zone (Fort Amador) ; 

 eastern Province of Panama (near Panama City ; mouth of the Rio 

 Chico) ; Isla Coiba; Isla San Jose; Isla del Rey. 



Two males and a female taken March 20, 1948, at La Honda, on 

 the coast of northern Los Santos, were near breeding condition. I 

 believed from their actions that they were on their nesting ground, 

 as when approached they ran back into the loose sands behind high 

 tide mark for concealment. One that I recorded March 16, 1949, 

 on the mudflats at the mouth of the Rio Chico, and 4 seen April 



