of Sirex, [509];

of Xiphidium, [321]

Ovipositor, [110], [552], [554];

Cynipid, [524];

of Locusta, development, [314], [315]

Owen, Ch., [40], [78]

Oxyethira, [484];

O. costalis, larva, [485]

Oxyhaloides, [234], [241]

Oxyura, [533], [534]