‘Insect’ means any of the numerous small invertebrate animals generally having the body more or less obviously segmented, for the most part belonging to the class insecta, comprising six-legged, usually winged forms, as for example beetles, bugs, wasps and flies, and to other allied classes of arthropods whose members are wingless and usually have more than six legs, as for example spiders, mites, ticks, centipedes and wood lice.