FAMILY TYRANNIDAE 49I 



Female, slightly duller colored throughout, with lesser development 

 of rictal bristles ; crown patch dull cinnamon. 



A male, taken on Cerro Tacarcuna, Darien, March 2, 1964, had the 

 iris dark brown ; maxilla and tip of mandible black ; base of mandible 

 pale horn color ; tarsus and toes dull brown ; claws fuscous-brown. 



Measurements. — Males (10 from Darien, Colombia, and Ecuador), 

 wing 69.8-72.6 (71.0), tail 58.1-61.8 (59.6), culmen from base 14.8- 

 16.1 (15.7), tarsus 18.1-19.4 (18.6) mm. 



Females (7 from Darien and Colombia), wing 62.6-69.1 (65.1), 

 tail 53.8-58.8 (56.2), culmen from base 14.3-16.0 (15.2), tarsus 

 17.0-18.8 (17.9) mm. 



Resident. Rare in forests in the Subtropical Zone on Cerro 

 Tacarcuna, Darien. 



The first specimen, a male, was caught March 2, 1964, in a mist 

 net set in green forest at 1460 meters elevation on the higher ridges 

 of Cerro Tacarcuna, near the international boundary with Colombia. 

 On March 7, C. O. Handley. Jr., captured a female in a net at 

 1250 meters spanning the channel of a small stream on the head- 

 waters of Rio Tacarcuna. These two specimens appear similar to 

 those of the northern Andes to the south in northwestern Colombia. 



MYIOBIUS ATRICAUDUS Lawrence: Lesser Black-tailed 

 Flycatcher, Moscareta Colinegra Menor 



Myiobius atricandus Lawrence, Ibis, ser. 1, vol. 5, April 1863, p. 183. (Atlantic 

 slope, Panama Railroad, Canal Zone, Panama.) 



Small ; greenish above, with yellow rump and black tail ; pale yellow 

 below, with a faintly darker breast band. 



Description. — Length 118-130 mm. Adult male, above greenish 

 olive ; crown faintly darker than back ; a partly concealed yellow 

 crown patch ; rump pale yellow ; wings brownish black, with faint 

 olive edgings ; upper tail coverts and tail black ; side of head slightly 

 paler than crown ; chin and throat pale buffy yellow, changing to light 

 buffy olive on f oreneck and upper breast ; lower breast and abdomen 

 pale yellow : tibia and under tail coverts grayish olive ; axillars and 

 under wing coverts dull white. 



Adult female and immature male like adult male but with crown 

 patch smaller. 



Adult males, iris dark brown ; basal half of maxilla brownish black, 

 becoming black at the tip ; mandible flesh color ; tarsus dark brownish 

 neutral gray ; toes and claws brownish to dusky neutral gray. 



Female, iris dark brown ; maxilla and tip of mandible fuscous- 



