machilid

from the GNU version of the Collaborative International Dictionary of English.

• noun A wingless insect living in dark moist places, as under tree trunks; they make erratic leaps when disturbed; called also jumping bristletail.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A wingless insect which can jump large distances when disturbed, in the Machilidae family.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun wingless insect living in dark moist places as under dead tree trunks; they make erratic leaps when disturbed