M. annulata (Hag.) is almost always a climber, some georgina (Sel.) nymphs are climbers, others are bottom-dwellers, taeniolata (Ramb.) lives usually on the bottom, and pacifica (Hag.) always does so. The older nymphs of the latter 2 spp. usually burrow, though taeniolata less regularly than pacifica. The feeding behavior of the bottom-dwellers and climbers is described and a note is furnished on the emergence site choice.