apterous

Fleas are apterous, walk but little, but leap to a height equal to two hundred times that of their own body.

Those which resemble the perfect insect, except that they are apterous, or not yet furnished with organs of flight.

Male and female larv similar, apterous, naked or covered, active.

In the autumn, however, the eggs which are laid give rise in part to winged forms and in part to apterous forms.

It appears to be apterous, and is said in scent and colour to resemble the bed-bug.