Coiba jeffersoni Kula, new species from the Nearctic Region and Coiba marshi Kula, new species from the Neotropical Region are described. A diagnosis is provided for both species, as is a key to the New World species of Coiba. Coiba jeffersoni likely attacks wood-boring beetle larvae, as label data indicate that specimens were reared from Carya ovata (Mill.) K. Koch (shagbark hickory), Juglans nigra L. (black walnut), and an undetermined species of Quercus L. (oak). The first records of Coiba dentatus Marsh in Brazil and Coiba woldai Marsh in Venezuela are reported.