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I have been having a lot of headaches concerning the genus Eristalis and its species. For example, E. tenax and E. pertinax are very similar. How can I distinguish both species and others?
Thanks

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Middle picture shows the two hair bands on the eyes: Eristalis tenax.

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Thank you very much

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also Eristalis pertinax has a more triangular abdomen en orange fore tarsae but there are a lot more Eristalis species to get you a headache...

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Thanks!

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another difference: the arista, In the E. tenax is bare while in E. pertinax is haired

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Thanks brazz