FAMILY FORMICARIIDAE 157 



without down when hatched. They develop rapidly as they are 

 feathered in 8 days, and leave the nest the day following. 



The birds have soft calls that may join in brief repetition to form 

 a song. 



DYSITHAMNUS MENTALIS SUFFUSUS Nelson 



Dysithamnus mentalis stiff usus Nelson, Smithsonian Misc. Coll., vol. 60, no. 3, 

 September 24 (September 27), 1912, p. 10. (Cerro Pirre, 1220 meters, Darien, 

 Panama.) 



Characters. — Male slightly more greenish gray above ; somewhat 

 less yellow, also slightly duller on lower breast and abdomen ; gray 

 on breast area extending farther posteriorly. Female, averaging 

 faintly lighter, greener above ; brown of crown lighter, especially on 

 the forehead ; flanks somewhat paler. 



Male and female taken on Cerro Mali, Darien, in February 1964, 

 had the iris dark brown ; base of mandible dark neutral gray ; rest of 

 bill black ; tarsus, toes, and claws neutral gray. 



Measurements. — Males (10 from Cerro Azul, Cerro Pirre, and 

 Cerro Mali, Darien), wing 60.3-64.2 (62.0), tail 37.5^2.5 (40.5), 

 culmen from base 16.1-17.3 (16.7), tarsus 20.0-21.0 (20.4) mm. 



Females (10 from Cerro Pirre and Cerro Mali, Darien), wing 

 59.9-62.5 (60.9), tail 37.2-40.8 (39.5), culmen from base 16.6-17.3 

 (16.9), tarsus 20.0-20.9 (20.3) mm. 



Resident. Recorded in small number, in the higher elevations on 

 Cerro Azul, eastern Province of Panama ; fairly common in Darien 

 on Cerro Pirre, and from 600 to 1200 meters on Cerro Tacarcuna. 



E. A. Goldman collected a male at 750 meters on Cerro Azul on 

 March 22, 1911. According to his notes it was ranging in under- 

 growth near ground level. One that we shot March 2, 1957, near the 

 trail on the high slope beyond Cerro Pilon at about 850 meters eleva- 

 tion was in such poor condition that it was not preserved as a speci- 

 men. To date these are the only specimen records known to me from 

 this mountain. Bond and de Schauensee (Acad. Nat. Sci. Phila- 

 delphia, Mon. 6, 1944, p. 33) recorded it at 900 meters on Cerro 

 Sapo, above Garachine, Darien, taken in 1941. In April and May 

 1912, Goldman found them fairly common on Cerro Pirre from 900 

 to 1580 meters, where he took the series from which E. W. Nelson 

 described the race suffusus. On February 4, 1961, I collected one on 

 this mountain at 900 meters. On Cerro Tacarcuna, two females were 

 taken by Dr. Galindo at La Laguna on May 31 and June 29, 1963. 

 In February 1964, these birds were common on the ridge of Cerro 



