If you had to look twice at this photo before you figured out what was happening don't feel bad. If you're not familiar with this species and its habits, it can be a bit tricky on the eyes. Yes, this is a snake eating another snake, tail first.
Ophiophagy is a very common occurrence in the tropics; it is defined as a specialized form of feeding or alimentary behavior of animals which hunt and eat snakes. And it is especially common in snakes.
This is a Central American False Coral Snake (Erythrolamprus mimus) consuming a centipede snake (Tantilla alticola). The false coral has a wonderful and poorly understood venom which is a cocktail of both hemo and neurotoxins.
Erythrolamprus mimusTantilla alticolafalse coral snakeophiophagyrara avis rainforest reservecosta ricamimicrycentipede snake