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| Adult Actenia brunnealis reach wingspans of about 20 - 40 mm. They are brownish, reddish and whitish-grey in colour. On their forewings a significant drawing is visible, which resembles a mask. The outer edges of the forewings have a dark boundary band filled with bright spots. | | |
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| The head is bright reddish yellow in colour with black compound eyes. The hairs on the antennae are light in colour. The legs are bright yellow and rounder and thicker at the joints. | | |
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| ...ong patches on their pronotums. In the males, the 8th to 10th antenna segments are as wide (or almost as wide) as they are long. The average width of the females’ antenna segments is slightly smaller. From the 5th segment on, the males’ antennae are reddish. The wing covers (elytra) are slightly elongated, narrow rounded and at the tips are slightly trimmed. The exterior (outer edges) blends into a sharp angle. Their surface is granulated, covered in dots and has a weak sheen. | | |
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| ...les are much smaller. The upper surface of their bodies is brownish. The patches of colour on the body differ in males and females. The abdomen has black and light stripes on the sides. The underside is much lighter than the upper surface. There are reddish spots on the upper surface of the last abdominal segments. The common field grasshopper can only be distinguished from similar species by the sounds it creates. | | |
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| The females lay greenish eggs with a rough hexagonal pattern. The caterpillars are brownish to reddish in colour. A wide, white stripe is present, while the back line is blurry pronounced. The caterpillars eat different kinds of clover and alfalfa. The moths visit flowers. They overwinter. The first adult moths emerge in mid April of the following ye... | | |
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| The anterior and middle pair of legs are mostly reddish in –colour, while the rear pair are black and red and larger. The upper part of the legs (femurs) is thick, and the tibia are curved and get thinner towards the feet (tarsi). Due to their appearance, Helophilus trivittatus can easily be confused wit... | | |
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| The hind wings are darker than the forewings. The head is bright reddish-brown and bears black compound eyes. The males have heavily feathered antennae. | | |
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