FAMILY PTILOGON ATIDAE 



171 



the broad break of the lowlands across northern Choco in northwestern 

 Colombia. The Andean birds, which lack the facial mask and have 

 smaller, dull-colored bills, form the distinct species ralloidcs, with three 

 or more closely similar subspecies ranging south to Peru and Bolivia. 



PTILOGON YS CAUDATUS Cabanis: Long-tailed Silky-flycatcher, 

 Capulinero Colilargo 



Figure 14 



Ptilogonys caudatus Cabanis, 1861, Journ. f. Orn., 8 (1860), p. 402. (Irazu, 

 Costa Rica.) 



Medium size; sleek, crested, tail more than half total length of bird; 

 blackish wings and tail; body gray and yellowish green (male) or all 

 yellowish olive (female). 



Description. — Length 200-244 mm. Male, crown pale gray; bushy 

 crest olive-yellow; rest of upper surface slate gray, slightly lighter on 

 rump; wing coverts slate gray; primaries and secondaries black, with 

 outer webs edged slate gray; tail black, tapered, with central pair of 

 feathers elongated, round white spots on outer four pairs; eye-ring 

 (sometimes incomplete) lemon yellow; throat pale olive-yellow, be- 

 coming more intense on breast; band across chest slate gray; flanks 

 yellowish green; abdomen pale yellow; undertail coverts lemon yellow. 



Female, like male but back and wing coverts olive-green, tinged gray 

 on rump; undersurface olive-green becoming grayish olive on abdo- 

 men. 



Immature, body gray-green; undertail coverts whitish; wings and 

 tail as adult. 



One (sex not recorded) taken on Volcan de Chiriqui, Chiriqui, Feb- 

 ruary 24, 1965, had the iris reddish brown, bill black, tarsus, toes, claws 

 black. 



Measurements.— Males (10 from Chiriqui), wing 91.0-101.0 (95.9), 

 tail 120.0-143.3 (130.2), culmen from base 12.3-15.4 (14.1), tarsus 

 18.6-22.4 (20.3) mm. 



Females (10 from Chiriqui) , wing 84.8-96.0 (90.4), tail 106.7-119.3 

 (115.1), culmen from base 12.5-14.9 (13.6), tarsus 17.5-21.7 (19.7) 

 mm. 



Resident. Common in the Temperate Zone in highlands of western 

 Chiriqui above 1500 m (Ridgely, 1976, p. 281) in forest edges and in 

 pastures and clearings with tall trees. Blake (Fieldiana: Zool., vol. 36, 

 no. 5, 1958, p. 552) , who says the bird "has seldom been reported below 

 an altitude of 8000 feet [— 2400 m]," lists specimens collected by Mon- 

 niche at Alto de Chiquero, Casita Alta, Copete (summit), Lerida, Pena 



