48 



BIRDS OF THE REPUBLIC OF PANAMA PART 4 



Colombia, was in "a small isolated tree covered with creeping spiny 

 palms." Goodwin gives the clutch as 3 to 5; the eggs are ''pale buff or 

 brownish white, spotted and blotched with olive brown and with under- 

 lying lilac or grey markings." Two eggs collected by T. K. Salmon at 

 Remedios, Antioquia, Colombia (no date) now in the British Museum 

 collection measure 34.6x24.6 and 34.0x24.65 mm. In the Santa Marta 

 region of Colombia, nests with eggs have been found from early April 

 until mid-May, and Hardy found a pair with dependent but nearly 

 full-grown young in Venezuela in July. 



The nominate race affinis found in Colombia and western Venezuela 

 differs in being clear white on the lower surface and the tip of the tail. 

 The difference between the two forms is readily seen when series of 

 birds from the two areas are examined. Occasional birds from eastern 

 Darien and San Bias in eastern Panama show some approach to this 

 lighter condition, but the population of northern Choco, Colombia, is 

 like that of Panama and is assigned to zeledoni. 



CYANOLYCA ARGENTIGULA ARGENTIGULA (Lawrence): 

 Silvery-throated Jay, Urraca Garganta de Plata 



Figure 5 



Cyanocitta argentigula Lawrence, Ann. Lyc. Nat. Hist. New York, vol. 11, nos. 

 3-4, February 1875, p. 88. (Near Pico Blanco, southern Cordillera de Talamanca, 

 Costa Rica.) 



Cyanolyca blandita Bangs, Proc. Biol. Soc. Washington, vol. 19, July 30, 1906, p. 

 109. (Volcan de Chiriqui, above Boquete, 2750 meters.) 



Description. — Length 255-265 mm. Adult (sexes alike), head, back, 

 chin, sides of neck, breast, and undersurface of wings black; lower 

 back, scapulars, rump, upper and undertail coverts, abdomen, and flanks 

 dusky, with a dull purplish blue tinge; wings and tail dull blue; fore- 

 neck broadly pale bluish white, with lower margin where it joins the 

 upper breast paler, nearly white; a narrow transverse band of bluish 

 white across the center of the crown at level of the eyes, extending 

 laterally as a narrow line along the side above and behind the eyes on 

 either side. 



A male and female, taken along the Boquete trail at 2100 m above 

 Bajo Grande, beyond Cerro Punta, Chiriqui, March 4, 1955, had the 

 bill black; inside of mouth dusky neutral gray; tongue neutral gray; 

 iris dark brown; tarsus, toes, and claws dull black. 



Measurements. — Males (10 from Chiriqui), wing 117.8-129.5 

 (122.7), tail 118.6-133.1 (126.6), culmen from base 27.4-30.8 (29.0), 

 tarsus 34.5-37.2 (35.8) mm. 



