. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. Bonner zoologische Beiträge Band 52 (2004) Heft 1/2 Seiten 149-154 Bonn, August 2004 A New Species of Tree Frog (Amphibia; Hyperoliiis) from the Bakossi Mountains, South-West-Cameroon Stefan LÖTTERS^^ & Andreas SCHMITZ"' " Johannes-Gutenberg-Universität, Zoologisches Institut, Mainz, Germany ~* Muséum d'histoire naturelle, Geneva, Switzerland Abstract. We describe a new species of tree frog (Anura; Hyperoliidae: Hyperoliiis) from the Bakossi Mountains,
. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. Bonner zoologische Beiträge Band 52 (2004) Heft 1/2 Seiten 149-154 Bonn, August 2004 A New Species of Tree Frog (Amphibia; Hyperoliiis) from the Bakossi Mountains, South-West-Cameroon Stefan LÖTTERS^^ & Andreas SCHMITZ"' " Johannes-Gutenberg-Universität, Zoologisches Institut, Mainz, Germany ~* Muséum d'histoire naturelle, Geneva, Switzerland Abstract. We describe a new species of tree frog (Anura; Hyperoliidae: Hyperoliiis) from the Bakossi Mountains, South West Cameroon. It is currently known only from its type locality. The new species shows sexual dichromatism with adult males usually displaying hour glass pattern on the dorsum and adult females having dorsal spotting. The new spe- cies is most similar to H. giittulatiis, H. phaiitasticiis, H. platyceps. H. riggenbachi, H. sylvaticiis nigerieiisis and the H. viridiflavus complex. Characters to distinguish these and the new species include aspects of the dorsal colour pattern, adult size, skin texture as well as presence/absence of a female guiar fold and sexual dichromatism, respectively. Key words. Anura, Hyperoliidae, Hyperoliiis dinlelmanni , Cameroon, taxonomy. 1. INTRODUCTION Hyperoliiis is a species-rich genus of tree frogs from sub-Saharan Africa (Frost 2002). According to SCHI0TZ (1999), the majority of species occurs in humid tropical forests of Central Africa. About 25 taxa have been reported from Cameroon, mainly from its south- western portion (Amiet 1972, 1973, 1975, 1979a, 1979b, 1980; Perret 1959, 1966; SCHI0TZ 1999; Frost 2002). Nevertheless, even this region is far from well studied. One example are the Bakossi Mountains, for which herpetological collections are limited (Stu- art 1986; Schmitz et al. 1999). To the best of our knowledge, the Hyperoliiis species from the Bakossi Mountains have not been studied at all. During field- work in 1997 a
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