An examination of collections revealed new distribution data for the species of these subgenera. Furthermore, the available species descriptions are not sufficient for species identification purposes, and they do not include modern taxonomic techniques, such as the use of high-quality images with illustration of the aedeagus and its endophallites. This paper aims to present a taxonomic revision of the subgenera Euhyboma, Parahyboma, and Rubrohyboma, providing information on species identities,

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... dentification and geographical distributions. In this study, endophallites of the male genitalia of D. ( Euhyboma ) brasiliense (Castelnau, 1840), D. (Parahyboma) furcatum (Castelnau, 1840), D. (Parahyboma) granulosum Paulian, 1933 and D. (Rubrohyboma) rubripenne (Gory, 1831) are also described and illustrated for the first time. Material and methods A total of 834 adult specimens of Deltochilum were examined. The examined material was kindly provided as follows: specimens from CEMT and MZUFPA were examined by us; the type material of all species names was examined from photos provided by Dr. Fernando Z. Vaz-de-Mello; MSc. Mario Cupello kindly provided data from CEIOC, DZUP, and MNRJ.