No they are not insects because they have eight legs and other reasons.They are "0.4mm in length and at least 0.25mm in width"(Wikipedia)
insects of most kinds
Velvet mites like all mites are not insects. They are arachnids. http://en.wikipedia.org/wiki/Mite
Nope the adult insect has 6 legs, but mature mites have 8 legs, like "tiny spiders".
Big eyed bugs [Geocoris pallens and Geocorcis punctipes], minute pirate bugs [Orius tristicolor], and predatory mites [Phytoseiulus persimilis] eat clover mites [Bryobia praetiosa]. Their use in the...