FAMILY FORMICARIIDAE I7I 



MYRMOTHERULA FULVIVENTRIS SALMONI (Chubb) 



Rhopias fulviventris salnwni Chubb, Ann. Mag. Nat. Hist., ser. 9, vol. 2, July 

 1918, p. 124. (Remedios, Antioquia, Colombia.) 



Characters. — Slightly paler above and below in both sexes. 



A male, near Cafiita, eastern Province of Panama, on the lower Rio 

 Bayano, February 6, 1962, had the iris yellow ; maxilla dull black ; 

 mandible neutral gray ; tarsus and toes neutral gray, claws dark neu- 

 tral gray. In another male, from Boca de Paya, Rio Tuira, Darien, 

 February 22, 1959. in which the iris was light bufify yellow, the fila- 

 mentous tip of the tongue was dull bufify white, while the fleshy base 

 was bright light orange. A female taken at Puerto Obaldia, San Bias, 

 February 16, 1963, had the iris light orange. 



Measurements. — Males (10 from Panama), wing 49.1-51.8 (50.1), 

 tail 31.7-36.4 (34.2). culmen from base 15.2-16.7 (15.7), tarsus 16.3- 

 17.2 (16.7) mm. 



Females (10 from Panama), wing 49.0-51.5 (49.9), tail 32.8-34.9 

 (34.0), culmen from base 13.9-16.4 (14.9), tarsus 16.3-17.0 

 (16.4) mm. 



Resident. Locally common in forested areas on the Pacific slope 

 from the lower Rio Bayano east through eastern Province of Panama 

 and Darien ; on the Caribbean side throughout San Bias. Specimens 

 seen from the Rio Pacora and extreme western San Bias (Mandinga) 

 are somewhat intermediate toward fulviventris. 



A series in the Museum of Comparative Zoology was collected 

 in April 1922 by Barbour and Brooks on Cerro Sapo, and in the area 

 adjacent on the Rio Esnape and Jesucito. The Fifth George Vander- 

 bilt Expedition in 1941 took others at Garachine and Cerro Sapo. 

 Hasso von Wedel collected numerous specimens at Perme, Ranchon, 

 and Puerto Obaldia. I found them also at Armila in this area in 

 1963. In my own investigations these birds were common at Jaque 

 in March and April 1946, and on the upper Rio Jaque in the same 

 months of 1947. They have been common also along the Rio Tuira 

 and its tributaries and on the lower Chucunaque. Inland here they 

 are found on the base of Cerro Tacarcuna at the old Tacarcuna village 

 site. 



MYRMOTHERULA AXILLARIS ALBIGULA Lawrence: 

 Black Ant-wren, Hormiguerito Negro 



Figure 16 



Myrmotheriila albigula Lawrence, Ann. Lye. Nat. Hist. New York, vol. 8, 

 1865, p. 131. (Line of the Panama Railroad, Atlantic slope, Canal Zone, 

 Panama. ) 



