Top 18 Most Common Insects in Ninh Binh

It is a big dragonfly with blue eyes, pale green thorax and dark brown abdomen with bright blue-green markings on the sides. It can reach a wingspan of about 11 cm and a body length of about 8 cm . Forewings are clear, the inner-half of the hindwings is brown, while the outer-half is clear. Segment 1 and sides of segment 2 of the abdomen are pale green. The dorsum of segment 2 is blue. Segment 3 is pale green on the sides with a triangular blue spot on the dorsum. Segments 4 to 7 are with a pair of baso-lateral, postjugal, and apical spots, all in bright orange. The number of spots are lesser in segment 8 to 10. Anal appendages are dark brown; the middle of the inner margins of the superiors have a projection like a straight edged shelf. Females is similar to the male; but the brown patch on the hind-wing may pale or absent. The blue on the dorsum of segment 2 will be broken up into four by a narrow brown mid-dorsal carina and a transverse line lying midway to form a cross like mark. Anal appendages are very broad and shaped like lance head.

The female has a hairy cephalothorax that is narrow in front and longer than it is wide. It is reddish-brown with a yellowish, U-shaped patch near the front and darker markings further back. The mouthparts are yellowish-brown and the long, slender, hairy and spiny legs are mostly brown. The abdomen has a flattened, pale grey dorsal surface with five pairs of sigilla (puncture-like spots where muscles are attached internally), numerous grey specks and a few dark streaks near the back. The male is reddish-brown with dark legs. His body length at 5 to 7 mm (0.2 to 0.3 in) is about half that of the female at 10 to 14 mm (0.4 to 0.6 in). This spider rests head-downwards on the web with its legs flexed. Its colouring makes it well camouflaged.

The length of the forewings is 3 - 3.5 cm for males and 4 - 4 cm for females.

The wingspan is 100–110 mm. The color varies from yellowish brown through orange brown to dark purplish red brown. The caterpillar has an aqueous bluish-green head with a narrow, double yellowish dorsal stripe running vertex to apex of clypeus and from vertex to nape. Body is grass green on dorsum with yellow dots, except those of the dorso-lateral line on segments 3 to 5, which are white. There is no color changing before pupation, only becoming duller in shade. Pupa is 46–50 mm long with dark chestnut color up to segments 8 to 10, and then color becomes much paler. Spiracles are black with central slit chestnut cremaster nearly black.

Opadometa fastigata, the pear-shaped leucauge, is a species of spiders in the family Tetragnathidae (long-jawed orb weavers). It is found in India to Philippines and Sulawesi. Members of the species have silvery or golden spots on the abdomen. They are elongated spiders with long legs and chelicerae. They are orb web weavers, weaving small orb webs with an open hub and few, wide-set radii and spirals. The webs have no signal line and no retreat. The web is a large horizontally-placed orb structure with a diameter of more than a metre. The entire web is often suspended by several long strands of silk attached to branches and leaves nearby. This species is separated from other Leucauge spiders by its pear-shaped abdomen and its unique fourth leg. In addition to the two rows of curved hairs (characteristic of Leucauge), this leg also has a thick brush of spines which are not present in most other species of Leucauge.

Arhopala bazalus, the powdered oakblue, is a lycaenid or blue butterfly first described by William Chapman Hewitson in 1852. It is found in Myanmar, mainland China, India (Assam, kerala and Sikkim), Indochina, Japan, the Philippines, and Taiwan.

Wet-season brood. Male upperside: white, a greyish-blue shade at base of the wings and along the veins, due to the dark markings on the underside that show through. Forewing: veins black; apex and termen black, the inner margin of that colour extended in an irregular curve from middle of costa to base of terminal third of vein 4, thence continued obliquely outwards to the tornal angle; interspaces 6 and 9 with short narrow greyish-white streaks of the ground colour that stretch into the black apical area but do not reach the margin; a short black subterminal bar between veins 3 and 4 and another, less clearly defined, between veins 1 and 2. Hindwing: veins 4 to 7 with outwardly dilated broad black edgings that coalesce sometimes and form an anterior, irregular, black, terminal margin to the wing. Underside, forewing: white, the veins broadly margined on both sides by dusky black; costal margin broadly and apex suffused with yellow; subterminal black bars between veins 1 and 2, and 3, and 4 as on the upperside but less clearly defined. Hindwing entirely suffused with yellow, the veins diffusely bordered with black; a more or less incomplete, subterminal series of dusky spots in interspaces 1 to 6; more often than not the spot in 5 entirely absent; a conspicuous chrome-yellow spot on the precostal area. Antennae black, obscurely speckled with white; head and thorax bluish grey; abdomen dusky black; beneath: the palpi and abdomen white, the thorax yellow. Female similar to the male but very much darker. Upperside: veins more broadly bordered with black; in many specimens only the following portions of the white ground colour are apparent. Forewing: a broad streak in cell and beyond it a discal series of streaks in interspaces 1 to 6, 9, and 10; the streaks in interspaces 1 and 3 very broadly interrupted by the transverse black bars; that in 6 more or less obsolescent. Hindwing: a broad streak in cell, a discal series of streaks in interspaces 2 to 7, and a posterior more or less obsolescent subterminal series of greyish-white double spots. Underside similar to that of the male only the veins much more broadly margined with diffuse black scaling. Antennae, head, thorax and abdomen as in the male. Dry-season brood. These differ from the wet-season brood as follows: male upperside, forewing: the apical and terminal black areas much restricted; veins concolorous; black subterminal bare less clearly defined; the lower one often obsolete. Hindwing: the black markings on the termen represented by short triangular irrorations (speckles) of black scales at the apices chiefly of the anterior veins. Underside: as in the wet-season, but the yellow much paler and somewhat ochraceous in tint. Female differs less from the wet-season female, but the black markings on both the upper and underside are narrower and less pronounced, and on the latter the yellow suffusion is paler and ochraceous in tint.