A striking sexually dimorphic new species of Castolus (Hemiptera: Heteroptera: Reduviidae) from Colombia, with new records from Neotropical countries and taxonomic notes on the genus.

The New World genus Castolus Stl, 1858 (Hemiptera: Heteroptera: Reduviidae) contains 16 described species. Based on material from northern Colombia we describe Castolus rafaeli sp. nov.