Figure 1.

(a) Optical image of Dysodius lunatus (green rectangle shows the wings and blue squares show the region where the oily defensive liquid is thought to be evaporated). (b) SEM micrograph of D. lunatus' cuticle under the wing, showing the scent liquid-secreting pore in the yellow square and the surface micro-ornamentation in the red square. (c) A higher magnification of the micro-ornamentation region, where the drop-like microstructures can be seen in detail (white arrow shows the preferential flow direction).