An old observation that finally got it’s name (thanks to Maarten Willems and Rayan Majoor). It is the larva of the Double-striped pug (Gymnoscelis rufifasciata) ^[1,2].

There are a number of comparable larva in other species with similar bdorsal pattern and coloration (the color tone can vary over a large range), but the key are the light stripes on the sides.

Here the larva is seen on White melilot, but I haven’t been able to find a relation with that plant. For what I remember the larve was roaming the plant not eating.

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Literature

¹ Nederlands Soortenregister

² www.lepiforum.de