220 BIRDS OF THE REPUBLIC OF PANAMA — PART 3 



broadens in the center of the back and terminates distally in a 

 rounded margin with a broad apterion, except for a few scattered 

 feathers, extending down to the region of the upper tail coverts. 

 Instead, in Formicarius analis panamensis as recorded in male and 

 female taken at Mandinga, San Bias, February 5, 1957, and a male 

 collected near the Candelaria Hydrographic Station, back of Madden 

 Lake, March 3, 1961, the dorsal feathering was an elongate ellipse 

 expanding over the back at the level of the heads of the humeri, 

 with a long, narrow central apterion. As it continues it narrows at 

 the lower end and terminates without a break at the upper tail 

 coverts. 



FORMICARIUS NIGRICAPILLUS NIGRICAPILLUS Ridgway: 

 Black-headed Ant-thrush, Gallito Hormiguero Cabecinegro 



Formicarius nigricapillus "Cherrie," Ridgway, Proc. U.S. Nat. Mus., vol. 16, 

 November 28, 1893, pp. 670 (in key), 675. (Buenavista, Province of Alajuela, 

 Costa Rica. ) 



Size and form of the Black-faced Ant-thrush, but head entirely 

 black. 



Description. — Length 165-175 mm; crown, side of head and neck, 

 and breast black; hindneck, upper side of neck, back, and scapulars 

 chestnut-brown ; rump and upper tail coverts rufous-brown ; tail 

 dull black, with a faint brownish tinge; primaries and secondaries 

 dusky-brown edged with chestnut-brown ; black of upper breast 

 changing gradually to brownish slate-gray on lower breast and ab- 

 domen ; side and flanks basally similar to abdomen, but with a wash 

 of olive ; under tail coverts rufous-brown ; under wing coverts black 

 at base and tip, ochraceous in center ; axillars similar, but central area 

 buff; inner webs of wings with a broad band of ochraceous. 



Adult female, similar to male, but with lower surface more olive. 



Measurements. — Males (9 from Bocas del Toro, Veraguas, western 

 sector of Province of Panama, and Costa Rica), wing 89.2-94.1 

 (91.3), tail 44.5-51.5 (48.9), culmen from base 22.8-26.1 (24.7), 

 tarsus 31.5-33.5 (32.4). 



Females (5 from Veraguas and Costa Rica), wing 85.0-92.4 (89.0), 

 tail 45.4-48.6 (46.4), culmen from base 24.1-27.6 (25.2), tarsus 

 29.8-31.5 (30.4) mm. 



Resident. Rare, in heavy forest in the upper Tropical Zone. Five 

 records — two in Bocas del Toro, two in Veraguas, and one on Cerro 

 Campana, western Province of Panama. 



The first report (under the name Formicarius analis) is of an 



