small. sap-sucking. scale-like insect coated with a white powdery wax.

Merriam-Webster Online Dictionary
mealybug (noun)
any of a family (Pseudococcidae) of scale insects that have a white cottony or waxy covering and are destructive pests especially of fruit trees
mealybug (Wikipedia)

Mealybugs
Mealybugs of flower stem, Yogyakarta, 2014-10-31.jpg
Mealybugs on a flower stem, Yogyakarta
Scientific classification
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Pseudococcidae

Heymons, 1915 
Genera
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Mealybugs are insects in the family Pseudococcidae, unarmored scale insects found in moist, warm climates. Many species are considered pests as they feed on plant juices of greenhouse plants, house plants and subtropical trees and also act as a vector for several plant diseases.

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