Certain attributes of Progomphus are commented upon, including the: (1) Split male epiproct, — (2) Mid-ventral spine of the first abdominal segment, — (3) Mid-dorsal spine of the first abdominal segment in P. borealis McLachlan, — (4) Probable removal of previously deposited sperm during copulation, — (5) Forcible ejection of eggs, and — (6) Jet propulsion in second instar larvae.