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| It feeds on nectar from thistles and cornflowers. In May or June the females lay about 100 to 300 eggs in groups on the host plants, on the undersides of the leaves. The caterpillars hatch after about 2 weeks and are yellowish-green and spotted black. They eat in groups. The older larvae are solitary. The caterpillars can be... | | |
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| The adult butterfly has a wingspan of 55 - 65 millimetres. The front wings have black edges. The females have an additional black spot on the front wings. The underside of the rear wings is grey-green. | | |
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| The mating season for southern green stink bugs extends from spring through to late autumn. The fertilized females lay their eggs on the leaves of different plants such as Crotalaria, wild blackberry (Rubus) and Cyperus rotundus. They glue about 260 barrel-shaped, whitish-yellow eggs to the surface of the leaves, in groups of 30 - 130. The eggs are about 1. 1 mm... | | |
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| Adult Helophilus trivittatus are among the largest domestic hoverflies and reach body lengths of 11 - 17 mm, the males being much smaller than the females. Their bodies are slimly built and whitish, whitish-yellow, yellow, brown and black in colour. | | |
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| ...e 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 with Helophilus pendulus. However the females of the latter, have a clearly visible black stripe on the face. In addition, the white diagonal line on the 4th abdominal segment is broken in the middle in Helophilus pendulus. | | |
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| After mating, the fertilized females lay their eggs in stagnant water which is often very muddy. Here, the oxygen content of the water plays a decisive role, as egg-laying can even take place in cesspools. From these eggs the so-called "rat-tailed maggots" hatch – larvae with... | | |
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| ...sh powder. Only the central stripe on the face is shiny, while in Melanostoma mellinum the entire face is a shiny black. The males have red compound eyes which are almost directly beside each other, while there is a distinct gap between those of the females. There are several simple eyes (ocelli) on the top of the head. The mouthparts are designed for licking up juices. The antennae are tripartite and have short bristles, whereas in Melanostoma mellinum, the antennae are almost completely hairless. | | |
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| The females lay their fertilized eggs on nettles. The eggs are green and 8 - 10 of them are united. The caterpillars hatch after 10 days and are black, 25 mm in length, and covered in dark spines. They feed on nettles, until they pupate 18 days later. The pupae... | | |
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| The eggs are deposited singly and the larvae feed separately. The females bring around 6 flies for each larva until they pupate. | | |
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| These beetles are predominantly diurnal and are often found near building openings as they attempt to enter in order to lay their eggs in the vicinity of possible food sources for their larvae. Fertilized females lay up to 60 eggs in small holes or other hiding places. | | |
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