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Anax imperator

- Males have a sky blue abdomen marked with a black dorsal stripe and an apple green thorax.
- Females have a green thorax and abdomen
- Thoracic antehumeral stripes absent.

http://www.dragonflysoc.org.uk/frameset.htm?animp&species&aes

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Brachytron pratense

- Hairy thorax
- Antehumeral stripes are narrow and green

http://www.dragonflysoc.org.uk/frameset.htm?brpra&species&aes