FAMILY FORMICARIIDAE I39 



larger size with slightly heavier bill. The female intermedins is much 

 paler than the same sex of the bird of Coiba. 



In addition to the series that I collected, there is one female in 

 the British Museum (Natural History) taken by Lieutenant-Colonel 

 H. J. Kelsall, on September 1, 1924, while on the St. George Ex- 

 pedition. 



THAMNOPHILUS DOLIATUS NESIOTES Wetmore 



Thamnophilus doliatus nesiotes Wetmore, Proc. Biol. See. Washington, vol. 82, 

 February 5, 1970, p. 773. (Rio Cacique, Isla del Rey, Archipielago de las 

 Perlas, Panama.) 



Characters. — Male, intermediate in color between nigricristatus 

 and eremmis ; under surface with black bars heavier than in nigri- 

 cristatus, and white interspaces correspondingly reduced. 



Female, also intermediate in depth of color on dorsal surface, but 

 variable, the paler examples resembling the darker individuals of 

 nigricristatus, the darker ones the paler eremnus. On average, slightly 

 larger than the other races found in Panama. 



Measurements. — Males (12 from islas del Rey, Canas, and Pedro 

 Gonzalez), wing 70.3-75.6 (73.0), tail 53.8-58.8 (56.1), culmen 

 from base 20.2-22.4 (21.4). tarsus 26.2-27.9 (27.2) mm. 



Females (7 from islas del Rey and Pedro Gonzalez), wing 69.4- 

 73.6 (71.4), tail 53.4-57.7 (56.3), culmen from base 20.6-22.5 

 (21.3), tarsus 27.0-27.9 (27.2) mm. 



Resident. Fairly common on part of the larger islands of the 

 Archipielago de las Perlas, Golfo de Panama; recorded from islas 

 Pedro Gonzalez. Viveros, Rey, and Canas (absent from Isla San 

 Jose). 



The Barred Ant-shrike was reported first from this group of 

 islands by C. Bovallius, who collected two males on Isla Viveros 

 April 5 and 10, 1882 (Rendahl, Ark. Zool., 1920, pp. 40-41). This 

 report was followed by Bangs (Auk, 1901, p. 30) who recorded six 

 taken on Isla del Rey in April and May 1901, by W. W. Brown, Jr. 

 In a second visit to this island in February and March 1904, this 

 collector secured eight more of the birds (Thayer and Bangs, Bull. 

 Mus. Comp. Zool., 1905, p. 150). One in the British Museum col- 

 lection was taken on Isla del Rey on June 26, 1924, by naturalists 

 of the St. George Expedition. In March 1944, I found it on Isla 

 Pedro Gonzalez, and in January 1960 on Isla Caiias, and also on 

 Isla del Rey. Both Viveros and Caiias are separated from Rey only 



