. The birds of the Republic of Panama. Birds. FAMILY SYLVIIDAE 179 Mus. Nat. Hist., vol. 7, 1937, p. 23). Riclgely notes that it occurs in the elfin cloud forest on the wind-swept summit of Cerro Jefe (900- 1000 m), eastern Province of Panama, where few other lowland birds occur. This species is an active searcher of foliage and twigs, moving rapidly from branch to branch, constantly wagging or raising its tail to dif- ferent angles. Usually encountered singly or in pairs, it often joins mixed foraging flocks. The diet seems to be purely animal matter: E. A. Goldman collected 2 at Cana, Darien
. The birds of the Republic of Panama. Birds. FAMILY SYLVIIDAE 179 Mus. Nat. Hist., vol. 7, 1937, p. 23). Riclgely notes that it occurs in the elfin cloud forest on the wind-swept summit of Cerro Jefe (900- 1000 m), eastern Province of Panama, where few other lowland birds occur. This species is an active searcher of foliage and twigs, moving rapidly from branch to branch, constantly wagging or raising its tail to dif- ferent angles. Usually encountered singly or in pairs, it often joins mixed foraging flocks. The diet seems to be purely animal matter: E. A. Goldman collected 2 at Cana, Darien, on May 26, 1912; the stomach of one contained 2 pentatonid nymphs 37%, a large fulgorid 35%, an ant 8%, bit of caterpillar skin 10%, spider remains 10%; the other contained a small caterpillar 25%, 2 small scarabaeids 20%, 3 curculionids (Cryptorhynchini) 15%, a small chrysomelid 5%, a small pentatonid 20%, homopteran remains 15%, bits of a spider with 2 or more eggs 5%. One taken by Burton near Pacora, Province of Pan- ama, weighed g (Bull. Brit. Orn. Club, 1975, p. 85); 2 weighed by Strauch (Bull. Brit. Orn. Club, 1977, p. 64) were and Figure 15.—Tropical Gnatcatcher, Cazajejen Tropical, Polioptila plumbea, male (below), female (above). The vocal repertoire includes "a rather thin but musical song con- sisting of a series of simple notes with decreasing intensity, sweet, weet, weet, weet, weet, sometimes faster and sibilant; the usual call is a tzeet-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wetmore, Alexander, 1886-1978. Washington : Smithsonian Institution
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