Eight species of Massarina and one of Lophiostoma are reported from tr
opical streams. A description is given for each species and light micr
ographs of previously poorly illustrated or remarkable species are pre
sented. Three species of Massarina: M. peerallyi, M. purpurascens, M.
thalassioidea, and one species of Lophiostoma: L. maquilingense, are n
ew to science.