FAMILY FORMICARIIDAE 249 



Characters. — Darker, blacker above on back and wings ; crown and 

 hindneck gray, with the feathers margined indistinctly with dusky ; 

 brown of under surface darker, more rufous-chestnut. 



Measurements. — Males (4 from Nicaragua and Bocas del Toro), 

 wing 75.5-81.6 (78.7). tail 28.5-31.4 (29.5), culmen from base 21.0- 

 21.2 (21.1), tarsus 36.8-37.5 (37.2) mm. 



Female (1 from Costa Rica), wing 74.4, tail 25.6, culmen from 

 base 20.6, tarsus 37.4 mm. 



Resident. Recorded from western Bocas del Toro. 



Benson collected two males near Almirante in 1927, one taken 

 May 16. Griscom described these as a separate form that he believed 

 to differ from the population of Costa Rica and Nicaragua in faintly 

 darker color above and darker chestnut below, with heavier black 

 lines on the breast. The distinction does not seem justified from the 

 limited material examined. The U.S. National Museum has a male, 

 received from the Gorgas Memorial Laboratory taken June 22, 1962, 

 at Almirante. 



HYLOPEZUS FULVIVENTRIS BARBACOAE (Chapman) 



Hylopesus dives barbacoae Chapman, Bull. Amer. Mus. Nat. Hist., vol. iZ, 

 November 21, 1914, p. 617. (Barbacoas, Nariiio, Colombia.) 



Characters. — More brownish olive above; brown of flanks and 

 under tail coverts brighter, more rufous ; breast cinnamon-buff. 



Measurements. — Males (10 from Darien and western Colombia), 

 wing 74.1-79.5 (76.7), tail 28.5-33.5 (30.5), culmen from base 

 20.0-22.6 (21.0), tarsus 35.3^0.0 (37.8) mm. 



Females (2 from Choco and Narifio, western Colombia), wing 

 71.6-73.1 (72.3). tail 26.1-28.0 (27.0), culmen from base 20.2 

 (1 only), tarsus 32.0-37.4 (34.7) mm. 



Resident. Rare in the forests of Darien. 



Benson, March 19, 1928, secured a male on Cerro Pirre, as re- 

 corded by Griscom (Bull. Mus. Comp. Zool.. vol. 69, 1929, p. 169). 

 Another, in the American Museum of Natural History, was taken by 

 Anthony and Ball at the Tacarcuna base camp, March 14, 1915. These 

 are the only known records at present for Panama. 



This race apparently is more common in northwestern Colombia 

 where M. A. Carriker, Jr., collected a small series in 1949 and 1950. 

 At Quebrada Salvajin, Cordoba, on the Rio Sinu, where he found it 

 in the same forests as Hylopesus pcrspicillatus pallidior, he noted that 

 the calls of the two were similar, except that the note of barbacoae 

 was faintly weaker. 



