Some of the more colourful Arge species can be identified from pictures, especially when the foodplant is known. But there are quite a number of all black species. These are extremely similar and most need to be examined under the microscope, in order to be identified. This usually involves killing the animal. We spared the animal on this page from that terrible fate. Meaning we have no idea about the exact species. Consequently we cannot give you any details about it's life or feeding habits.
The most likely candidates are: Arge metallica, Arge thoracica, Arge pullata, Arge rustica, Arge ciliaris, Arge berberidis, Arge nigripes, Arge ustulata of Arge enodis.