Top 20 Most Common Insects in Barcelona

The wingspan is 1.8 - 1.9 cm.

The bath white is a small white butterfly with a wingspan of 45 to 50 mm. The underside of the hindwing has a pattern of greenish blotches, which is characteristic of the Bath whites and easily identifies it fromThe Bath white is a small white butterfly with a wingspan of 4.5 - 5 cm. The underside of the hindwing has a pattern of greenish blotches, which is characteristic of the Bath whites and easily identifies it from other pierids. Sexes can be differentiated by markings on the forewing. The male is differentiated from the female by the markings on the upperside of the forewing. The apex of the forewing is black with white spots and lines. There is a black spot at the end of the cell. In the case of the female, there is an additional discal spot in 1b. The female also has an obscure row of terminal and marginal spots on the upper hindwing. Male: Upperside: white. Forewing: basal half of costa narrowly irrorated with black scales, a broad irregular quadrate black spot over the discocellulars; apex and termen anteriorly, above vein 3 broadly black, with a subterminal series of spots of the ground colour, prolonged as fine lines to the terminal margin. Hindwing: uniform, the markings on the underside showing faintly through; a costal spot before the apex, and in some specimens, some obscure, anterior terminal markings indicated by irrorated black scaling. Underside: white. Forewing: the form of the markings as on the upperside but the base of the cell with an irroration of green scales, the black discocellular spot extended to the costa, often washed with green or with a green centre to the black; the apical patch green not black, with the spots of the ground colour on it ill-defined and obscure; a black or greenish-black spot in the outer half of interspace 1. Hindwing: green; costal margin at base yellow; dorsal margin white; a spot in middle of cell, another above it in interspace 7, a curved irregular discal series of conjoined spots beyond the cell, of which the upper two spots in interspaces 1 to 6, white; the veins sometimes faintly yellow. Antennae dusky-black; head, thorax and abdomen fuscous black; beneath; head, thorax and abdomen white. Female: Upperside: differs as follows: Forewing: a dusky-black streak extends from the base along costa and terminates at the black spot on the discocellulars; a transverse, somewhat quadrate black spot in the outer half of interspace 1, with sometimes a short ill-defined black streak below it; the black area on apex and anterior portion of termen broader, the white spots on it blurred and obscure. Hindwing: a large costal black spot before apex; a broad, black, subterminal, inwardly diffuse, curved band in continuation of the same, and a terminal series of clavate black marks that start from the outer margin of the black subterminal band. Underside: markings much as in the male but broader. Antennae, head, thorax and abdomen as in the male. Wingspan: 5 - 6 cm

Large white (Pieris brassicae) is visually similar but quite larger than its close relative P. rapae. It lays its eggs on food plants such as cabbages – the origin of its common name – leading to many farmers' classifying this species as a pest.

The male is smaller than the female, the front wing of the male is 1.5 - 1.6 cm whereas a female front wing is 2 cm, and has a patch of scent-producing scales known as the androconia, which can be seen as a dark patch on the upperside of the forewing.

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.

Charaxes jasius is a medium to large butterfly with a wingspan reaching 7 - 8 cm in males and 8 - 9 cm in females. The uppersides of the wings are dark brown with orange margins. The hindwings bring two short tails, characteristic of most species of the genus. Close to these tails there are a few blue markings. The underside of the wings is reddish brown with numerous darker bands edged with white or gray. The orange marginal band is also present on the undersides of the wings and it is preceded by a white transversal band. The caterpillar is green, cylindrical and has two yellow ocelli on the back. The head bears four horns facing backwards.

The length of the forewings is 2.5 - 3 cm.

ab. esculi Hbn.[ of Satyrium ilicis ] (73b) (Fig. 559/560) is a small form with rather long tail and unicolorous upperside (there being only a small red spot at the anal angle); on the underside the row of bars of the forewmg is indistinct and the brownish yellow submarginal spots of the hindwing are but slightly prominent; Portugal, Spain and South France; according to the size of the discal patch of the forewing some transitional specimens have been provided with names (ilicioides, macidata), such as probably occur wherever ilicis is found. The yellow patch is apparently most strongly developed in North Africa.

Euphydryas aurinia has a wingspan of 30–42 millimetres (1.2–1.7 in) in males. The females are usually larger than the males, with a wingspan of 40–50 millimetres (1.6–2.0 in). These small butterflies are variable in markings and colouration, with many forms and subspecies. The adult butterflies usually show a chequered pattern of brown, orange, and yellow markings. Silver markings are present on the hindwing edge. The underside of the wings is patterned with yellow, orange, and brown without any silver colouration at all. The eggs are yellow, and easily identified because of the large batch size. The larvae are black.

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.