Crepidodera
Included in the tribe Alticini Crepidodera (= Chalcoides in Joy) contains five brightly coloured metallic species. Unlike other genera in the tribe (e.g. Altica and Longitarsus) they are readily identified and should give no real problems, Both the female and male genitalia are distinctive and although they should not be needed I have included photo's of all species.

 

aurata

aurea

fulvicornis

nitidula

plutus
 
 
Key
 
1. First four segments of antennae yellow, the remaining black, the contrast very clear and definitive. (Plate 5.) plutus (Latreille)
2.5-3.7mm. Pronotum and elytra normally unicolourous although bicoloured specimens are not uncommon. Green, coppery sometimes blue, in the field often appearing purple. Adults on willows (Salix), occasionally poplars (Populus) and blackthorn (Prunus spinosa) (Cox, 2007). Locally common.
-- Antennae either all yellow or yellow basally gradually darkened towards apex. (Plates 1-4) 2.
 
2. (1) Pronotum and elytra unicolourous. Antennae entirely yellow/orange or only slightly darkened towards apex. (Plates 2 and 3) 3.
-- Pronotum and elytra different colours.Antennae yellow/orange at base clearly darkened towards apex. (Plates 1 and 5) 4.
 
3. (2) Size larger 2.8-4mm. Unicolourous blue, coppery, or green. Pronotal punctures coarse but sparser especially on disc On poplars (Populus. aurea (Fourcroy)
Normally on poplars (Populus), occasionally willows (Salix). Have been recorded from cherries (prunus), blackthorn (P.spinosa), birches (Betula) and hazels (Corylus). Widespread and often abundant where found.
-- Size smaller 2-3mm. Brilliant metallic bright green blue or coppery. Pronotal punctures coarse and dense. On willows (Salix) fulvicornis (Fabricius)
Antennae often slightly darkened towards apex. Normally on willows (Salix), occasionally poplars (populus). Widespread and often abundant where found.
 
4 (2). Pronotum crimson red, elytra green. Scutellar striae linear and simple. (Plate 6.) On willows (Salix) aurata (Marsham)
2.5-3.5mm. Normally on willows (Salix), occasionally poplars (populus), Locally often on alder (Alnus). Widespread and often abundant where found.
-- Pronotum green, elytra blue/violet. Scutellar striae confused. (Plate 9.) On aspen (Populus tremulae). nitidula (Linnaeus)
3-4mm. Not as shining as the other species. Separated from the rest of the genus by the lack of a single linear scutellar stria. Many authors use the tooth at the apical angle of the elytra. I have found this to be difficult to appreciate or just missing. Almost exclusively on poplars (Populus) most notably aspen (P.tremulae). Scarce (Notable B).
 
Right Antenna
 

Plate 1. aurata

Plate 2. aurea

Plate 3. fulvicornis

Plate 4. nitidula

Plate 5. plutus
 
Scutellar striae
 

Plate 6. aurata

Plate 7. aurea

Plate 8. fulvicornis

Plate 9. nitidula

Plate 10. plutus
 
Aedeagi (dorsal and lateral) and Spermathecae
 

Plate 11. aurata

Plate 12. aurata

Plate 13. aurata

Plate 14. aurea

Plate 15. aurea

Plate 16. aurea

Plate 17. fulvicornis

Plate 18. fulvicornis

Plate 19. fulvicornis

Plate 20. nitidula

Plate 21. nitidula

Plate 22. nitidula

Plate 20. plutus

Plate 21. plutus

Plate 22. plutus