O. leucomelana, [29];

O. tricornis, [48];

O. tridentata, [48] f.

Osten Sacken on Bugonia, [499];

on Chaetotaxy, [446];

on classification of Diptera, [456];

summary of Portschinsky, [512]

Othniidae, [265]

Otiorhynchides, [437]

Ourocnemis, [355], [356]