FAMILY FORMICARIIDAE I43 



neck, and sides of head black, each feather with longitudinal white to 

 dull bufify streaks along the shaft ; throat and foreneck dull black, 

 shading to slate on the breast, where streaked broadly with white to 

 bufify white ; slate of the breast shading to buffy brown on the ab- 

 domen, with the light streaking reduced or absent; under tail coverts 

 cinnamon ; under wing coverts and edging on inner webs of wing 

 feathers cinnamon-buff. 



Immature female (male in this stage not seen), with the wing 

 coverts and the inner primaries and secondaries tipped narrowly with 

 blackish slate, and terminally with cinnamon-buff ; lower breast and 

 abdomen barred indistinctly with dull slate and pale buff. 



A female taken February 8, 1962, at Cafiita on the lower Rio 

 Bayano, eastern Province of Panama, had the iris dark wood brown ; 

 cutting edge of maxilla and base of mandible brownish white ; rest 

 of maxilla fuscous; rest of mandible neutral gray; tarsus, toes, and 

 claws neutral gray, tinged on tarsus with greenish. 



Measurements. — Males (17 from Darien), wing 71.5-75.0 (72.5), 

 tail 53.4-61.0 (57.2), culmen from base 18.5-22.6 (19.8), tarsus 

 22.3-23.9 (23.0 average of 16) mm. 



Females (16 from Darien), wing 67.3-72.7 (70.2), tail 53.9-61.5 

 (57.3), culmen from base 18.0-21.0 (19.4), tarsus 22.4-24.0 

 (23.2) mm. 



Resident. Fairly common at Cabo Garachine and in the Tuira- 

 Chucunaque Valley; probably also the valley of the Rio Bayano (one 

 record, Cafiita). 



The species was first recorded from Panama by Chapman (Amer. 

 Mus. Nat. Hist., vol. 36, 1917, p. 366) from specimens collected by 

 W. B. Richardson with the Harold Anthony Expedition in 1915, at El 

 Real and Tapaliza. Ludlow Griscom (Amer. Mus. Nov., no. 282, 

 1927, p. 6) "found it abundant in the thorny thickets at Cape 

 Garachine." His visit there was on February 27, 1927. The Fifth 

 George Vanderbilt Expedition of 1941 also recorded it at this locality 

 (see Bond and de Schauensee, Acad. Nat. Sci. Philadelphia, mem. 6, 

 1944, p. 32). In February and March 1959, I collected several along 

 the Rio Tuira, near the point where it is joined by the Rio Paya. 

 Others were found toward the end of the month in the Rio Chu- 

 cunaque Valley, near the mouth of the Rio Tuquesa (Quebrada San 

 Felix). They lived in undergrowth in the forest, where they were 

 not timid so that they were easily seen, in contrast to the elusiveness 

 of the two more widely distributed species, the Barred and the Slaty 

 Ant-shrikes. The calls were louder than those of the other two 



