Vipera berus bosniensis, the Balkan cross adder or Bosnian viper, is a venomous viper subspecies endemic to the Balkan Peninsula. Geographic range It is only found within the Balkan Peninsula, particularly the Herzegovina region of Bosnia and Herzegovina, hence its common name. Taxonomy McDiarmid et al. (1999) follow Golay et al. (1993) and recognize V. b. bosniensis as a subspecies of V. berus. However, it has been considered a full species in recent literature. References Further reading Golay P, Smith HM, Broadley DG, Dixon JR, McCarthy CJ, Rage J-C, Schätti B, Toriba M. 1993. Endoglyphs and Other Major Venomous Snakes of the World. A Checklist. Geneva: Azemiops. 478 pp. External links berus|bosniensis Reptiles described in 1889