FAMILY FORMICARIIDAE I45 



white spot at the end of each feather ; under surface, including edge 

 of wing, slaty gray ; under wing coverts, and line on inner webs of 

 remiges, white. 



Female, brown to huffy brown above, brighter on the crown ; wing 

 coverts fuscous-black, tipped with buff to huffy white ; wings fuscous- 

 black, edged with brown ; rectrices fuscous-black, edged with brown, 

 and tipped with white or buff ; concealed white in bases of feathers of 

 center of back as in the male ; under surface huffy brown to grayish 

 brown, paler on throat ; under wing coverts and inner edge of remiges 

 buff. 



Juvenile, dull cinnamon-brown above ; duller on throat and sides, 

 with the breast and abdomen grayish white. The male in this plumage 

 is somewhat grayer than the female. 



A male, collected at Juan Mina, Canal Zone, January 10, 1961, 

 had the iris dark brown ; maxilla, except cutting edge, dusky neutral 

 gray ; cutting edge of maxilla, mandible, tarsus, toes, and claws neutral 

 gray. 



A female, taken on Cerro Galera, Canal Zone, January 8, 1961, had 

 the iris brown ; maxilla fuscous ; mandible, tarsus, toes, and claws 

 neutral gray. Another, at Canita, Panama, February 6, 1962, had the 

 iris wood brown ; cutting edge of bill pale neutral gray ; rest of 

 maxilla black, and of mandible, tarsus, toes, and claws neutral gray. 



Measurements. — Males (18 from Panama Province, Canal Zone, 

 Colon, San Bias), wing 66.7-71.6 (68.2), tail 50.3-56.0 (53.8), 

 culmen from base 20.2-22.5 (21.1), tarsus 19.3-22.5 (21.1) mm. 



Females (14 from Panama Province, Canal Zone), wing 66.1- 

 70.0 (68.3), tail 51.0-57.7 (54.3), culmen from base 19.7-21.5 

 (20.7), tarsus 20.5-22.1 (21.2) mm. 



Resident. Common, usually in pairs, in forested areas in the Tropi- 

 cal Zone ; on the Pacific slope from the western sector of the Province 

 of Panama (Cerro Campana, and 5 kilometers west of La Campana 

 on Rio Camar6n) eastward to the Colombian boundary; on the 

 Caribbean slope throughout from western Bocas del Toro to eastern 

 San Bias ; to 850 meters on Cerro Campana ; 900 meters on Cerro 

 Tacarcuna (La Laguna). 



Salvin (P.Z.S., 1867, p. 144) listed specimens forwarded by Arce 

 from "Santiago de Veragua" but this I believe to be in error like a 

 number of other records in the same collection from this locality, 

 as this ant-shrike is not known on the Pacific side west of eastern 

 Code. I found it near El Valle, Code, but only on the low divide 

 at the headwaters of the Rio Indio which drains to the Caribbean. 



