FAMILY PARUL1DAE 



313 



the trees or undergrowth. I have seen individuals of this species swing- 

 ing on the side of a branch for an instant with wings and tail spread, 

 so that they resemble a huge butterfly; many observers have remarked 

 on their amazing tameness. At the elevations where both species of 

 Myioborus occur they may both be found in the same mixed flock. On 

 Cerro Punta, however, I have found torquatus at 1990 m in a humid 

 cloud forest area where the trees were laden with moss and epiphytes, 

 while miniatus occurred at the same elevation in a drier area. 



M. torquatus sings throughout the year, although not so frequently 

 between July and February as does M. miniatus. One song is an elabo- 

 rate series of varied, mellow phrases, another is "a rather soft, slightly 

 musical tsit-tsit-tsce, repeated" (Ridgely, 1976, p. 303). 



On February 26, 1955, I noted that all the Collared Redstarts on 

 Cerro Punta were paired, but I have no information on the breeding of 

 this species in Panama. Skutch, however, has observed several nesting 

 pairs in Costa Rica (Pac. Coast. Avif., no. 31, 1954, pp. 371-376). 

 The first nest he found was on April 3, when it was nearly completed. 

 It and the other nests were placed on the ground, at the edge of a bank, 

 in a hollow on a grassy hillside near woods, or beneath a decaying log. 

 The nests were made of fine vegetable fibers, fibrous roots, bamboo 

 leaves, and scales from tree ferns. Two or three eggs form the clutch; 

 the eggs are white, sprinkled all over with light brown spots, most 

 concentrated on the large end, and measure between 18.3x13.5 and 

 19.1x13.5 mm. The incubation period is 15 days. 



In the few days just before and just after her eggs hatched, a female 

 that Skutch watched would flutter helplessly on the ground in front of 

 the nest. At hatching the young have pink skin and sparse natal down. 

 By 10 days of age they are well feathered and at 13 days they leave the 

 nest. Young hatched in April leave their parents by mid- June, when 

 they are difficult to distinguish from adults. In August they seem to 

 be paired. 



BASILEUTERUS TRISTRIATUS (Tschudi): Three-striped Warbler, 



Cerrojillo 



Myiodioctes tristriatus Tschudi, 1844, Archiv. f. Naturg., 10 (1), p. 283. (Valley 

 of Vitoc, Jurrin, Peru.) 



Small; crown striped black and buff; upper surface yellowish olive; 

 undersurface light greenish yellow. 



Description. — Length 113-123 mm. Adult (sexes alike), forehead 

 and superciliary, extending to nape, buff; sides of crown black; central 

 crown stripe olive-ocher, becoming buff on nape; rest of upper surface, 



