Haemagogus equinus which normally breed in tree-holes have been shown to deposit their eggs in paddles of ovitraps, placed at ground level. In a 23-month study in Tobago, West Indies, 6,678 paddles were examined of which 69 were positive for Hg. Equinus eggs. More traps were positive in the rainy season when compared to the dry season. The ovitraps have been shown to be a useful device in Haemagogus populations studies.