FAMILY ICTEKIDAE 



341 



the shell very slightly roughened, have a faint gloss, and are marked 

 with a few widely scattered irregular spots that vary from cinnamon 

 and chocolate to purple, scattered among which are many tiny dots of 

 the same color. They measure 34.0x24.8 and 35.2x24.8 mm. 



PSAROCOLIUS WAGLERI (Gray): Chestnut-headed Oropendola, 

 Chacarero Comun 



Figure 28 



C. [acicus] Wagleri G.R. Gray, 1845, Genera, Birds, 2, p. 342, pi. 85. ("Coban," 

 Guatemala.) 



Zaryhynchus wagleri ridgwayi van Rossem, 1934, Bull. Mus. Comp. Zool, 77, p. 

 405. (Limon, Limon, Costa Rica.) 



Large; few narrow feathers of central crown elongated, forming a 

 thin crest; head, rump, flanks, and abdomen dark brown; wings and 

 rest of body black; tail bright yellow. 



Description.— Length, male 336-353 mm, female 273-289 mm. Adult 

 male, head, nape, throat, and upper breast bay; rump, upper tail coverts, 

 flanks, lower abdomen, and undertail coverts chestnut; rest of body and 

 wings iridescent black; central pair of rectrices (slightly shorter than 

 others) and outer web of outermost pair black, others bright yellow; 

 underwing coverts black. 



Adult female, like male, but smaller, and less glossy black (browner) 

 below. 



A male collected at El Cope, Code, on February 23, 1962, had the 

 iris pale blue, tip of bill extending back on cutting edge of mandible 

 and on base of rami and around base of pileum light neutral gray; rest 

 of bill yellowish buff; tarsus, toes, and claws black. Some males have 

 the bill greenish yellow with a dusky tip (Eisenmann) . A female taken 

 at Puerto Armuelles, Chiriqui on January 30, 1966, had the iris pale 

 blue; bill light greenish yellow changing to pale neutral gray at tip; in- 

 side of mouth including top of tongue pale neutral gray; tarsus and toes 

 fuscous-brown; claws black. 



Measurements. — Males (10 from Panama), wing 187.0-227.0 

 (214.1), tail 124.8-144.0 (133.5), culmen from base 62.4-72.4 ( 66.1), 

 tarsus 37.7-41.1 (40.0) mm. 



Females (10 from Panama), wing 145.4-161.9 (152.1), tail 100.0- 

 117.3 (110.0), culmen from base 46.6-52.0 (49.9), tarsus 30.1-33.8 

 (31.8) mm. 



Resident. Common but local, in the humid lowlands of both slopes 

 in forests, second growth, borders, and open areas that have trees suit- 

 able for nesting. More local on the Pacific slope, where it is absent en- 



