They make erratic leaps when disturbed

• Wingless insect living in dark moist places as under dead tree trunks

WordNet Word definitions in WordNet
n. wingless insect living in dark moist places as under dead tree trunks; they make erratic leaps when disturbed [syn: jumping bristletail ]

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
machilid \mach"i*lid\, n. A wingless insect living in dark moist places, as under tree trunks; they make erratic leaps when disturbed; called also jumping bristletail . Syn: jumping bristletail.

Wiktionary Word definitions in Wiktionary
n. A wingless insect which can jump large distances when disturbed, in the Machilidae family.