FAMILY FRINGILLIDAE 



609 



ince, on the Pacific slope. It has been collected at El Coco, Gago, near 

 Anton, and near Penonome. As this is perhaps the most easily dis- 

 tinguished of all the forms of Ammodramus savannarum, it is indic- 

 ative of a fair degree of isolation for the grassland birds of the llanos 

 of Code. Further evidence of this is supplied by another endemic em- 

 berizine, Sicalis luteola eisenmanni, described from many of the same 

 localities, the only population of 5. luteola occurring between Guate- 

 mala and Colombia. 



This species is very localized in Panama. My only experience with 

 this population was near Anton, Penonome, and El Coco. On May 10, 

 1953, 3 miles northwest of Anton, I found a small colony in which males 

 were singing and females had nests. One female performed a broken 

 wing act. The birds were in a stretch of previously burned pasture sur- 

 rounded by taller grass that would probably be burned later. The songs 

 of the males resemble those of North American birds. The birds were 

 very inconspicuous and might be mistaken for pipits that were all 

 around. I saw one darting at a passing Mourning Dove (Zenaida 

 macroura) . 



JUNCO VULCANI (Boucard): Volcano Junco, Junco del Volcan 



Figure 47 



Zonotrichia vulcani Boucard, 1878, Proc. Zool. Soc. London, p. 57, pi. 4. (Volcan 

 de Irazu, 10,000 ft., Costa Rica.) 



Medium size; bill rather slender; upper surface mostly streaked 

 dark brown; side of head and undersurface gray. 



Description. — Length 152-161 mm. Adult (sexes alike), lores and 

 narrow mask around eye white; narrow superciliary gray; crown olive- 

 brown; rest of upper surface bufTy brown, streaked with dark brown 

 on upper back; feathers of wing dark brown, edged lighter; rectrices 

 dark brown, edged lighter; sides of head and undersurface light gray, 

 becoming whitish on abdomen and buffy brown on flanks and under- 

 tail coverts. 



Immature, brown of upper surface more reddish than in adult, 

 streaking heavier; undersurface dingy buff, streaked with sepia except 

 on center of belly. 



A male collected on Volcan de Chiriqui, Chiriqui, on March 3, 1965, 

 had the iris bright orange-yellow; maxilla light mouse brown; mandi- 

 ble flesh color; tarsus light brownish white; toes slightly darker; claws 

 fuscous-brown. 



Measurements. — Males (10 from Volcan de Chiriqui, Chiriqui), 



