| Pale Green Weevil (Polydrusus impressifrons (Gyllenhal, 1834)) |
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Scientific name: Polydrusus impressifrons (Gyllenhal, 1834) Common name: Pale Green Weevil Other names: Leaf Weevil French name: Charançon vert pâle Order: Coleoptera Family: Curculionidae Wingspan : 4-5 mm Biotope: On the leaves of many deciduous trees like Willows, Poplars, Birches, Elms, Oaks, etc. Geographic area: Europe, introduced to the United States and to Canada. Observation period : April to September |
You can distinguish weevils of the Polydrusus genus compared to weevils of the Phyllobius genus from the shape of the scrobe (line where the antenna is inserted). It is rather straight, short and hardly visible on Phyllobius while it is curved and extends as far as below the eyes on Polydrusus. The scrobe is curved on Polydrusus impressifrons but it is rather short. The Pale Green Weevil has an oblong-shaped body. It is covered with golden green scales. The elytra show thin longitudinal black lines which appear punctuated. The pronotum is marked by sparse bare dots which appear black. The head is elongated. The eyes are small, black, prominent and rather distant to each other. The antennae are thin. The scape is slightly arched and with an enlarged tip. The first article of funicle is longer and bigger than the second. The legs are orange yellow. Polydrusus impressifrons feeds on leaves. Larvae feed on roots. There is a possible confusion with Polydrusus formosus. This last one has larger eyes and closer one from the other. The black longitudinal lines on the elytra are more conspicuous. The snout is slightly longer and ends straight without any notch. |
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Alain Ramel (thanks to him) has confirmed the identification of Polydrusus impressifrons. This picture is the first try of the use of a slave flash. I need to continue with this technique in the future, especially for shiny bugs which are often causing refection problems with the flash light. |
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The thin lines on the elytra and the small size of the eyes seems to indicate the Polydrusus impressifrons species. |
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All the tries to shoot pictures without flash have been very difficult, especially because the insect was always moving. Many pictures went directly to the trash. Here is the best one I have kept. |
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My pictures are getting better. However, on this one the focus plane is a little too far at the back of the eye. |
André Bon March 2017