Capitalization

I have been at a loss as to the rules of capitalization for named insects. Wikipedia has a good entry on capitalization. Here is a relevant snippet:

Some authors, though few if any grammar books, also treat the names of individual species of living things (animals, plants, etc) as proper nouns, and use initial majuscules for them, as in e.g. Peregrine Falcon while asserting that others, e.g. horse or person are not common names of species and should not be capitalized.