Fer De Lance - (Bothrops atrox)
The Fer De Lance is an extremely dangerous snake and is the deadliest found in Latin America. It is widespread and found throughout both Central and South America. The Fer De Lance has been reported to cause more human fatalities than any other American snake. In the past, prior to effective antivenin being developed, the bite from this snake was lethal approximately 7% of the time. It continues to be a much feared snake due to it's fast acting and extremely toxic venom. Even with prompt treatment, Fer De Lance bites frequently cause massive tissue destruction, disfigurement and disability.
Lower Leg of 11 year old boy in Equador, 2 weeks after a Fer De Lance bite. Extensive necrosis, pending amputation
http://www.squidoo.com/dangerous-snakes-of-latin-america