Top 20 Most Common Insects in Algeria

The southern green shield bug larvae molt five times before they reach their mature size. They are named for their unpleasant scent and are considered pests due to their preference for feeding on leguminous plants such as soybeans. Wasps and flies that parasitize the southern green shield bug are sometimes used as biological controls for its population.

Colias croceus has a wingspan of 46–54 millimetres (1.8–2.1 in). The upperside of the wings is golden to orange yellow with a broad black margin on all four wings and a black spot near the centre forewing. Usually these butterflies settles with its wings closed, consequently the black margin of the uppersides of the wings is difficultly visible. The underside lacks the black borders and is lighter, with a more greenish tint, particularly on the forewings. In the forewing underside is the same dark spot as on the upperside, but often with a light centre; the hindwing underside has a white centre spot, often with a smaller white or dark dot immediately above it. Sometimes, a row of black dots occurs on the underwings' outer margins, corresponding to where the black border ends on the upperside. Females differ from the males in having yellow spots along the black borders on the upperside. In flight, Colias croceus is easily identifiable by the intense yellow colouring, much brighter than that of the lemon-yellow male common brimstone which also lacks black markings. Like all Colias species they never open their wings at rest. In a small proportion of females (about 5%) the golden upperside colouration is replaced by a pale cream colour. These females have been distinguished as form helice. The pale form helice does not seem to be that distinct as intermediates exist and the variation is to some extent related to humidity during development, with dryer conditions producing paler colouration. These pale forms helice can be confused with Berger's clouded yellow (Colias alfacariensis) and the rarer Pale clouded yellow (Colias hyale). Even the palest C. croceus tends to have more black on the upperside however, in particular on the hindwings. Young caterpillars are yellow-green, with a black head. Later they become completely dark green, with a white red spotted lateral line after the third moult. The pupae are green and have a yellow side stripe. This species is rather similar to Colias myrmidone, Colias chrysotheme, Colias erate, Colias hyale, Colias alfacariensis, Colias caucasica, Colias aurorina.

The old World swallowtail (Papilio machaon) is commonly just called the "swallowtail," giving it the added title of "old world" to distinguish it and remind us that it comes from the "old world" (Asia, Africa, Europe). The upper side of them is a beautiful combination of pure white with black striping, the underside being a brownish version of the same thing. There is blue and two red dots on its back side.

The adult males grow up to 1.09 - 1.4 cm long, while the females reach 1.2 - 1.8 cm of length. The basic coloration of the body varies from light brown to grayish. The eyes are rather big. The sides of thorax sometimes present a white or darker longitudinal stripe. The wings are scaly, oval, very short, reaching only the middle of the second rear segment. Larvae are particularly green in the early stages.

The giant african mantis (Sphodromantis viridis) shares its common name with five other mantids, which brings up its secondary name: the Bush mantis. These mantids are widely kept as a pet, which is a good conversation starter. While you may associate them with the color green, they are also dark brown.

The upperside forewings are a bright orange with a dark outside edge border and with eight or nine black spots. The hindwings are dark with an orange border. Some females also have a row of blue spots inside the orange border and are known as form caeruleopunctata. The undersides are patterned in a similar way but are paler. The black spots on the forewings are outlined in yellow and the dark colouring is replaced by a pale brownish grey. The hindwings are the same brown/grey colour with small black dots and a narrow orange border. The caterpillars (larvae) are usually green, but some have a purple stripe down the middle of the back and along each side.

A particularly hated invasive species in North America, european paper wasp (Polistes dominula) is well-known for its tendency to nest on human porches and sting if approached. Nests are controlled by a dominant female queen, who lays most of the eggs. Dominance among individuals can be predicted by the shape, size and number of spots they display, with more spots signaling greater dominance within the nest.

Red admiral (Vanessa atalanta) is a visually striking species of butterfly. Unusually territorial, males will compete for choice areas, and females will only mate with males that maintain their own territories. This butterfly is known for being particularly patient with human interactions, even to the point of perching on clothing or flesh.

They are 1 - 1.5 cm long. Head, scutellum and elytra are dark-brown, with a thick and long tawny hair on elytra and abdomen. Elytra show two series of white spots on the sides of the central hull. Scutellun is rounded and hairy, but glabrous in the posterior. The fifth humeral slot is bifurcated.

The species has alternating bands of black and yellow-gold. At approximately 10–15 centimetres (3.9–5.9 in), Scolopendra cingulata is one of the smallest species in the family Scolopendridae. Its venom is also not as toxic as that of other scolopendrid centipedes.