FAMILY PAKULIDAE 



329 



in forest and second-growth woodland of both slopes from the Costa 

 Rican border to central Panama, where it is less frequent and inter- 

 grades with the race semicervinus, as described above. It has been 

 found as high as 1620 m, where Monniche collected it at Horqueta, 

 Chiriqui (Blake, Fieldiana: Zool., vol. 36, no. 5, 1958, p. 563). Ridgely 

 (in lift.) finds that during the dry season it seems to disappear from 

 areas of the Canal Zone where streams mostly dry up, e. g., around 

 Summit and in Madden Forest. 



Skutch (Pac. Coast Avif., no. 31, 1954, pp. 346-356) found that in 

 Costa Rica the nesting season runs from March to August. Both sexes 

 build the nest, which is oven shaped and usually placed in a niche on a 

 steep slope, often close to a stream or river. The nest takes up to 13 

 days to construct. It is made of coarse rootlets, dry grass blades, leaf 

 fragments, and weed stems; the lining is of fine shredded fibers and 

 leaf skeletons. Two eggs form a clutch; they are glossy white, marked 

 around the blunt end with a heavy wreath of brown blotches or spots 

 and thinly spotted with the same shades over the remaining surface. 

 The average measurements of twenty eggs are 20.7x14.9 mm. In- 

 cubation is performed entirely by the female and requires 16 to 19 

 days. When the young hatch they have pink skin and scanty gray 

 down. The interior of the mouth is yellow. They are fed by both par- 

 ents and usually remain in the nest until 13 or 14 days old, when they 

 are well feathered. Only a single brood is reared each year. 



BASILEUTERUS FULVICAUDA SEMICERVINUS Sclater 



Basileuterus semicervinus P.L. Sclater, 1861, Proc. Zool. Soc. London, 28 (1860), 

 p. 84. (Nanegal, Ecuador.) 



Characters. — Breast unmarked; cheeks buffy; buffy superciliary 

 more prominent; upper surface lighter; light area of tail more ex- 

 tensive. 



A female collected at Armila, San Bias, on February 23, 1963, had 

 the iris dark brown, base of gonys and lower half of mandibular rami 

 dull brownish white; rest of bill black; tarsus and toes brownish honey 

 yellow; claws light mouse brown. 



Measurements. — Males (10 from eastern Panama), wing 61.5-66.0 

 (63.6), tail 49.0-54.8 (517), culmen from base 12.7-15.3 (13.8), tar- 

 sus 19.9-22.3 (21.4) mm. 



Females ( 10 from eastern Panama) , wing 58.9-64.0 (60.6) , tail 45.8- 

 52.5 (49.7), culmen from base 12.3-14.8 (13.5), tarsus 19.3-22.6 

 (21.2) mm. 



