344 BIRDS OF THE REPUBLIC OF PANAMA PART 3 



dark wood brown ; maxilla black ; acute tip of mandible light brown ; 

 sides of the rami dusky neutral gray, rest of mandible dark neutral 

 gray; tarsus and toes somewhat dark orange; claws grayish brown. 

 A female, February 17, 1966, from the same locality had eye, bill, 

 and feet like the male. 



Measurements. — Males (26 from Costa Rica, Chiriqui, Veraguas, 

 and Los Santos), wing 44.8-47.9 (46.3), tail 26.0-30.2 (28.7), 

 culmen from base 11.2-12.2 (11.7), tarsus 19.3-21.1 (2C.1) mm. 



Females (22 from Chiriqui, Veraguas, Herrera, and Los Santos), 

 wing 47.8-50.0 (48.7), tail 27.^30.9 (30.3). culmen from base 11.3- 

 12.3 (11.8), tarsus 18.2-20.5 (19.1) mm. 



Resident. Locally common in Tropical Zone thickets and open 

 forests of the Pacific slope from the Costa Rican line in southwestern 

 Chiriqui, east through southern Veraguas, and both sides of the 

 Azuero Peninsula; to 700 meters elevation (Buena Vista, Chiriqui; 

 Cerro Montuosa, on the boundary between Veraguas and Herrera). 



In general habits and notes these birds are a counterpart of 

 Manacus v. vitellinus. On several occasions I have found males 

 gathered in small groups, located through their low notes and the 

 usual snapping sounds that accompany their displays. Always they 

 have been shy and difficult to see in the rather dense low undergrowth 

 and thickets that are their haunts. Aldrich (cit. supra, p. 97) de- 

 scribes a male in display "hopping around and around a triangular 

 course on the floor of the thicket. Each hop carried the bird over one 

 side of an equilateral triangle, approximately two feet on a side. Each 

 hop occurred at rhythmic intervals of about one second and was 

 accompanied by a flit of the wings and a loud snap." 



In a small area of original forest on the Rio Cobre, near Sona, 

 on June 13, 1953, these birds were common. A female flushed from a 

 bush in undergrowth came from a nest about a meter above the 

 ground. The frail little cup made of plant fibers, light brown in color, 

 was placed rather precariously in a small fork. It contained two 

 nestlings three or four days old. I noted that they had down on the 

 dorsal surface. Meise (in Schonwetter, Handb. Ool., pt. 15, 1968, p. 

 124, and pt. 16, 1969, p. 129) cites notes from Skutch that describe 

 the two eggs in a set as dull white to pale bluish gray, heavily marked 

 with brown, often uniformly over the entire surface, in a wreath 

 on the larger end, or in a wreath with only slight markings at the 

 ends ; measurements are 19.4-23.0 X 14.3-15.9 mm. 



I found these birds in small number on the eastern side of the 

 Azuero Peninsula, in Herrera (La Cabuya, Santa Maria) and Los 



