Top 20 Most Common Insects in Bologna

Unique for its black coloring with white spots, the white spotted rose beetle has spread across Europe and into Asia by hitching a ride on traded plants. It's a voracious eater that consumes many parts of plants in addition to pollen and nectar, so some label it as a garden pest.

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 Early Darter (Sympetrum fonscolombii) is a species of dragonfly in the family of the leaflets (Libellulidae), which belongs to the great dragonfly (Anisoptera).

Named for its striking pattern, european firebug is often described as the "firebug." It is known to congregate in large aggregations reaching as many as one hundred individuals at a time, particularly while still immature. Because they feed upon the seeds of lime trees, clusters of mating individuals can often be found at the bases of these trees in late spring.

Marmalade hoverfly (Episyrphus balteatus) is a hoverfly species that tends to congregate in groups. This sometimes alarms people who mistake them for wasps, although marmalade hoverfly does not sting and is harmless to humans and animals. It feeds on nectar and pollen grains, possesses the rare ability to crush the latter.

The bright stripes on the back of the italian striped bug make it easy to identify when spotted climbing on flowers and plants. It is typically found in gardens and meadows in warm, sunny locations. It is most often spotted in the spring and summer. Adults are present throughout the year on the Channel Islands and in Britain.

Ischnura elegans can reach a body length of 2.5 - 3.5 cm and a wingspan of about 3.5 cm. Hindwings reach alength of 1.4 - 2 cm. Adult male blue-tailed damselflies have a head and thorax patterned with blue and black. There is a bi-coloured pterostigma on the front wings. Eyes are blue. They have a largely black abdomen with very narrow pale markings where each segment joins the next. Segment eight, however, is entirely pale blue. At rest, the wings of most damselfly species are held back together, unlike dragonflies, which rest with their wings out flat. The thorax of juvenile males has a green tinge. Female blue-tailed Damselflies come in a variety of colour forms.Juveniles may be salmon pink, form rufescens; violet, form violacea and a pale green form. The colour darkens as the damselfly ages. Mature females may be blue like the male, form typica; olive green thorax and brown spot, form infuscans or pale brown thorax and brown spot, form infusca-obseleta.

The meadow brown (Maniola jurtina) is similar to the Gatekeeper in the way that it rests with its wings open due to the "eye spots" on either end of its wings that ward off predators. While the color is a deep brown, the caterpillar form is a beautiful bright green with little, white hairs and a dark line leading down its back.

It rests with closed wings when not in flight.

Common drone fly (Eristalis tenax) is the most common hoverfly worldwide. Noted for its remarkable adaptability, it has spread to every continent other than Antarctica and even survives in the frigid Himalayas. It is territorial and will attack any other species that ventures into its chosen territory, and it is apt to dwell within this area for the rest of its life.