For instance, I know of many butterflies that have multiple generations per year, but what about beetles, bees, hoverflies and so on?
I'll assume you refer to bi- or multivoltinism, because "voltinism" is a general term that includes univoltinism (one generation per year).
A lot of insect species develop two or more generations per year. This probably depends more on longevity and habitat of a particular species than the phylogenetic position. I'm not aware of any overall review of voltinism in insects, but if you search a little, you'll be able to find info about more narrow taxa or at least specific species. Here's an example for Odonata: http://ecoevo.uvigo.es/IJO/free/Corbet_etal_2006.pdf
It is extremely common. And the ones that display a single generation/yr, do it usually in response to environmental/host phenology conditions. But this univoltinism can be broken in the lab, so most of those have the potential for multiple generations.
Thanks Jernej and Giancarlo,
as correctly noted i am mainly interested in insects showing uni- compared to bi- or multivoltinism. The dragonfly study is here really helpful and interesting. I will look for any other reviews for aditional taxa.
Search Aphids and Coccids, they have many uni-, be- and multivoltine species. As they are important pests of different agricultural crops there are hundred of papers about their ecology and biology.
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