FAMILY FORMICARIIDAE 169 



Myrmotherula fulviventris viduata Hartert 



Myrmotherula viduata Hartert, Nov. Zool., vol. 5, December 31, 1898, p. 492. 

 (Cachavi, northwestern Ecuador.) 



Male, more olive on upper and lower surface; female definitely- 

 darker brown on upper surface, and to a lesser degree on the under- 

 parts. 



Pacific slope of Colombia in central Choco from the Rio Jurubida, 

 inland to the base of the Serrania de Baudo, south to western 

 Ecuador. 



The darker coloration is distinctive and easily evident. 



MYRMOTHERULA FULVIVENTRIS FULVIVENTRIS 

 (Lawrence) 



Myrmetherula [sic] fulviventris Lawrence, Ann. Lye, Nat. Hist. New York, 

 vol. 7, 1862, p. 468. (Line of Panama Railroad, Atlantic slope, Canal Zone, 

 Panama. ) 



Characters. — Averaging slightly darker above and below in both 

 sexes. 



Measurements. — Males (10 from western Panama), wing 49.0- 

 52.6 (50.9), tail 30.7-35.0 (33.0), culmen from base 14.1-16.2 

 (15.2), tarsus 17.0-18.0 (17.4) mm. 



Females (10 from western Panama), wing 47.8-52.3 (50.3), tail 

 31.7-35.9 (33.1), culmen from base 14.9-16.4 (15.4), tarsus 16.6- 

 17.0(16.8) mm. 



Weight, ^ 8.5, 9.0; $ 8.8 grams (G. Child, G. V. N. Powell). 



Resident. Found locally in forested areas on the Caribbean slope, 

 from western Bocas del Toro (Almirante) east to the northern Canal 

 Zone and the eastern sector of Colon ; on the Pacific slope recorded 

 from the high southern slope of Cerro Campana, and Chorrera, 

 western Province of Panama. 



This form is widely distributed in the lowland forests of the 

 Caribbean slope from near the Costa Rican boundary to the northern 

 Canal Zone. 



It was described by Lawrence from male and female collected by 

 McLeannan and Galbraith near the line of the railroad on the north 

 slope in what is now the Canal Zone. Peters (Bull. Mus. Comp. 

 Zool., vol. 71, 1931, p. 320) recorded a male from Bocas del Toro 

 taken March 25, 1928, by von Wedel at 600 meters on the trail 

 leading to Boquete from the Laguna de Chiriqui. The bird is fairly 

 common in the vicinity of Almirante where I found it regularly in 

 January and February 1958. I collected it also at the head of the 



