cc. Antennæ more elongate, segments more or less distinctly separated; head sunk into an emargination of the thorax; wings when present with the veins crowded toward the anterior margin; palpi not leaf-like. Hippoboscidæ
d. Wings absent or reduced and not adapted for flight.
e. Wings and halteres (balancers) absent. M. ovinus, the sheep tick. Melophagus Latr.
ee. Wing reduced (or cast off), halteres present.
f. Claw bidentate; ocelli present. On deer after the wings are cast off. L. depressa. Lipoptena Nitsch
ff. Claw tridentate ([fig. 161 f]). On Macropis. B. femorata. Brachypteromyia Will.
dd. Wings present and adapted for flight.
e. Claws bidentate.
f. Ocelli present; head flat; wings frequently cast off. On birds before casting of the wing. Lipoptena Nitsch.
ff. Ocelli absent; head round; wings present. The horse tick H. equina may attack man ([fig. 162]). Hippobosca L.