264 BIRDS OF THE REPUBLIC OF PANAMA PART 4 



The race aestiva breeds from southeastern Alberta across Canada to 

 Prince Edward Island and Nova Scotia and south to central southern 

 Montana, central Oklahoma, northern Arkansas, central Alabama, 

 central Georgia, and central South Carolina. It winters from central 

 Mexico to Peru and northern Brazil. 



Nineteen specimens, of aestiva in the Smithsonian collection from 

 Panama were all from the Pacific slope, from Puerto Armuelles, Chiri- 

 qui, through Los Santos and Herrera to El Llano on the Rio Bayano, 

 Province of Panama, and El Real, Darien. Four were taken on Isla 

 Coiba, Veraguas, and 1 on Isla de Canas, in the Pearl Islands Archi- 

 pelago. One at Buena Vista, Chiriqui, was at 690 m. A male in the 

 British Museum (no. 85.3.8.387) was taken by Arce in 1868 at Calove- 

 vora, Veraguas, on the Caribbean slope. Of the several taken in March, 

 only 1 male showed extensive streaking. 



Ralph Browning has found that 2 Yellow Warblers from Panama 

 in the Smithsonian collection are from a distinctive population from 

 Nebraska that is characterized by more heavy streaking than in aestiva, 

 morcomi, or sonorana, more intense yellow on the undersurface, and, 

 on the upper surface, it is usually paler than all other races except 

 sonorana. This population may merit description as a new subspecies. 

 The 2 Panama specimens are USNM no. 386476, a male taken at 

 Jaque, Darien, on April 8, 1946, and USNM no. 457705, a female 

 from Ft. Clayton, Canal Zone, taken September 22, 1953. 



DENDROICA PETECHIA MORCOMI Coale 



Dendroica aestiva morcomi Coale, 1887, Bull. Ridgway Ornith. Club, no. 2, p. 82. 

 (Fort Bridger, Utah [ = Wyoming].) 



Dendroica aestiva brewsteri Grinnell, 1903, Condor, 5, p. 72. (Palo Alto, Cali- 

 fornia.) 



Dendroica aestiva ineditus Phillips, 1911, Auk, 28, p. 85. (Matamoros, Tamauli- 

 pas, Mexico.) 



Characters. — Slightly larger than aestiva, duller (less yellow) green 

 coloration; breast streaking heavy. 



This race breeds from western Washington, central British Colum- 

 bia, and eastern Montana south to southern California and northwest- 

 ern Baja California across to northwestern Texas. It winters from 

 Baja California to Ecuador, northern Colombia, Venezuela, and French 

 Guiana. Three specimens from Panama are all males: USNM no. 

 461264 from San Felix, Chiriqui, February 21, 1956; no. 533282 from 

 Punta Balsa, Chiriqui, February 25, 1966; and no. 462376, from Pedasi, 

 Los Santos, March 9, 1957. 



