Ditrochous, [494], [520]

Divided eyes, [409]

Docophorus fuscicollis anatomy, [348];

D. icterodes, D. cygni, [349]

Dog, biting-louse of, [349]

Dohrn on tracheal system of Gryllotalpa, [132];

on embryology of Gryllotalpa, [336]

Dolichopoda palpata, [322]

Dorsal vessel, [133], [134];

reversed action, [435]