. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 264 J. Köhler & S. Lötters. Fig. 3: Colostethus sp. A from the vicinity of Cobija. ventral stripes; instead they have white marks. The dorsolateral stripes are broadened behind the head about three times of their posterior width, thus resulting in a scapular hour glass pattern. In life, ventral surfaces were bright yellow. We suggest that these two specimens are most probably not conspecific with C trilineatus. However, information is only insufficient and we th
. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 264 J. Köhler & S. Lötters. Fig. 3: Colostethus sp. A from the vicinity of Cobija. ventral stripes; instead they have white marks. The dorsolateral stripes are broadened behind the head about three times of their posterior width, thus resulting in a scapular hour glass pattern. In life, ventral surfaces were bright yellow. We suggest that these two specimens are most probably not conspecific with C trilineatus. However, information is only insufficient and we therefore desist from assigning a name At a forest swamp near Cobija we recorded an advertisement call (Fig. 5) which probably corresponds to this species. However, since we did not see the frog individual calling, we do not assign the calls to Colostethus sp. A with certainty. The call (mean call duration ms) consisted of two pulsed notes (mean note duration ms). Interval duration between the two notes varied from 30 to 41 ms (mean ± ). Notes were repeated with a rate of notes/minute Call energy was distributed between 4000 and 4900 Hz, with a dominant frequency of 4450 Hz. The second note was always slightly higher in frequency than the first note of the call (ca. 100 Hz difference). Compared with calls of C trilineatus from Cuzco Amazó- nico, Peru (De la Riva et al. 1996) and from Cobija (own data) our recordings mainly differ by having longer note duration and lower dominant frequency (4450 versus 5400 Hz). However, the general structure of the call is similar in both species. Epipedobates hahneli (Boulenger, 1883) Specimens from the vicinity of Cobija coincide well morphologically with the description provided by Haddad & Martins (1994). De la Riva et al. (1996) already mentioned the presence of E. hahneli in Bolivia, but this was based on calls only, heard at Nareuda, Departamento Pando. Thus, we provide the first vouchered record of E. hah
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