28 BIRDS OF THE REPUBLIC OF PANAMA PART 3 



bufif below, and more rufous on the crown, with the black barring 

 averaging very slightly heavier and wider. The back also is some- 

 what more heavily barred. These are D. c. nigrirostris Todd. It 

 should be noted that the supposed character of blacker bill for this 

 race does not hold. This form extends into Colombia to Unguia and 

 Acandi, on the western shore of the Gulf of Uraba. and east through 

 the valley of the Rio Sinu, and beyond to Coloso in northwestern 

 Bolivar. D. c. coloinbianus Todd found on the Pacific slope from 

 north central Choco south to the Rio San Juan is definitely darker 

 above and below, and duller rufous on the crown. In the area west 

 of the lower Rio Atrato it intergrades with nigrirostris, Todd's type 

 material being from this intermediate stock. Two additional forms 

 of limited range in Mexico that have been described may be men- 

 tioned to make this survey complete. The subspecies legtersi Paynter, 

 of limited range in central Quintana Roo is paler above and below 

 than sancti-thomae. The race sheffleri Binford of southern Oaxaca 

 has the black bars on the lower surface narrower, with corresponding 

 increase in the buff so that the birds appear paler. The bill also is 

 light colored, both above and below, in contrast to the darker color 

 found in the other races. 



As indicated, two subspecies are found in Panama. 



DENDROCOLAPTES CERTHIA HESPERIUS Bangs 



Dendrocolaptes sancti-thomae hesperiiis Bangs, Auk, vol. 24, July 1907, p. 299. 

 (Lagarto, Costa Rica.) 



Characters. — Dark bars on lower surface narrower, with buff 

 interspaces duller ; crown also duller buff, and more narrowly barred. 



A female, collected near Puerto Armuelles. Chiriqui, March 12, 

 1966, had the iris dark brown; maxilla and tip of mandible black; 

 base of mandible fuscous-brown ; cutting edge of maxilla and of 

 mandible for basal half, and the gonys pale brownish white ; tarsus 

 and toes dull grayish green ; claws dull slate. 



Measurements. — Males (10 from Costa Rica), wing 121.0-130.1 

 (125.4), tail 107.9-121.8 (114.2), culmen from base 39.2^2.3 

 (40.7), tarsus 28.2-29.6 (28.8) mm. 



Females (8 from Chiriqui and Costa Rica), wing 122.0-127.8 

 (124.8), tail 110.1-119.2 (113.3), culmen from base 38.3^2.6 

 (39.9), tarsus 26.7-30.6 (28.9) mm. 



Resident. Known in Panama from the base of the Burica Peninsula, 

 and Bugaba in southwestern Chiriqui. 



The race ranges mainly in southwestern Costa Rica in the valley of 



