We report the first record of the Scarlet-thighed Dacnis (Dacnis venusta) for middle Magdalena valley in the department of Santander, Colombia. This record extends the range of the species more than 185 km to the east of its previously known distribution. This observation is part of a project to monitor the fauna in the influence zone of the Topocoro dam and shows the importance of studying fragmented ecosystems and less frequently sampled sites such as the Serranía de la Paz.