. Bonner zoologische Monographien. Zoology. 151. Fig. 46: Distribution of forest wrens, Campylorhynchus zonatus, C. albobrunneus, and C. turdinus. Explanation: A Distribution of C. zonatus and C. albobrunneus in northwestern Colombia and easternmost Panama. Stippled area and open circles — C. zonatus imparilis. 1 Rio San Juan, Dep. Antioquia; 2 Rio Mulatos; 3 Rio Tulapa; 4 Rio Zungo (observ.); 5 Quimari; 6 Tierra Alta. Shaded area and open squares — C. albobrunneus harterti. 7 Saisa trail (E. O. Willis, observ.); 8 Rio Tanela; 9 Mutata; 10 Dabeiba; 11 Rio Salaqui; 12 Rio Jurado; 13 Rio Napipi;
. Bonner zoologische Monographien. Zoology. 151. Fig. 46: Distribution of forest wrens, Campylorhynchus zonatus, C. albobrunneus, and C. turdinus. Explanation: A Distribution of C. zonatus and C. albobrunneus in northwestern Colombia and easternmost Panama. Stippled area and open circles — C. zonatus imparilis. 1 Rio San Juan, Dep. Antioquia; 2 Rio Mulatos; 3 Rio Tulapa; 4 Rio Zungo (observ.); 5 Quimari; 6 Tierra Alta. Shaded area and open squares — C. albobrunneus harterti. 7 Saisa trail (E. O. Willis, observ.); 8 Rio Tanela; 9 Mutata; 10 Dabeiba; 11 Rio Salaqui; 12 Rio Jurado; 13 Rio Napipi; 14 Bahia Solano; 15 Baudö Mountains; 16 Rio Baudö; 17 Bagadö and La Vieja; 18 El Tigre and Rio Tamanä; 19 Puerto Obaldia. Open squares on edge — C. a. albobrunneus. 20 western base of Cerro Tacarcuna; 21 El Real; 22 Cana; 23 Jaque. Records in Darien after A. Wetmore (pers. comm.). C. albobrunneus is mainly white with dark brown upperparts. C. zonatus is barred black and white above and white with blackish spots below. Despite conspicuous color differences these species may hybridize along the contact zone in southwestern Colombia (see text). B Gene- ralized distribution of C. zonatus (1, stippled areas); C. albobrunneus (2, solid area); and C. turdinus (3, area hatched vertically). De Schauensee (1959) reported this form from Tierra Alta and Quimari in the upper Sinü region. C. zonatus is missing in the wet forests of the Pacific lowlands and eastern Panama (occupied by C. albobrunneus) but recurs in the dry forests of Middle America and northwestern Ecuador. C. albobrunneus and C. zonatus may be in contact in the forests to the southeast of Turbo and in southwestern Colombia near the Ecuadorian border. In this latter area a phenotypically very unstable population exists (C. albobrunneus aenigmaticus De Schauensee; 1948, 1966) which might represent a hybrid population between parapatric C. albobrunneus and C. zonatus. Based on the examination of the type series of C
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