The genus is Dendrobates, the species tinctorius, and the 'robertus' refers to the locale of the frog. Sometimes this locale is named after a location, sometimes it may even be given a vernacular name. For example, I have dendrobates auratus 'costa-rican green and black', but other people have dendrobates auratus 'highland bronze' or dendrobates auratus 'hawaiian'. The locale denotes the specific region/area from which that frog is found, which can be determined by differences in pattern and coloration within the same species. Though locales are of the same species and can breed, it is highly discouraged that you interbreed locales, as it could result in lines and locales becoming muddied and cause us to lose that "pure-bred" lineage back to the wild specimens.