If you are a dipterist, you collect flies....

If you are a....

philatelist, you collect stamps
numismatist, you collect coins and banknotes
lepidopterist, you collect butterflies and moths
coleopterist, you collect beetles
dipterist, you collect flies (!)
arctophile, you collect teddy bears
oologist, you collect birds' eggs
deltiologist, you postcards (I know one!)
notaphilist, you collect banknotes (Don't we all?)
tegestologist, you collect beer coasters
phillumenist, you collect matchboxes or matchbook labels
scripophilist, you collect old bond and share certificates