From World Wide Words, "As a professional entomologist, I enjoyed your bit about insect common names." "As an aid to my students over the last 35 years, I have informed them of the rule you explain." "Your piece also illustrates the hazards of common names divorced from the relevant scientific names." "In my experience, a 'June bug' and 'tumblebug' are beetles and 'greenfly' is a 'bug'." "'Blackfly' is more interesting, since it can be used for a true fly and also for an aphid/'bug' - its usage would be clarified if the rule were followed in this case - 'black fly' for the true biting fly, and 'blackfly' for the aphid." But it's not. -- Speranza, Bordighera