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Butterflies of Zihuatanejo

SUPERFAMILY PAPILIONOIDEA

-Animals (Kingdom Animalia)

-Arthropods (Phylum Arthropoda)

-Hexapods (Subphylum Hexapoda)

-Insects (Class Insecta)

-Winged and Once-winged Insects (Subclass Pterygota)

-Butterflies and Moths (Order Lepidoptera)

-Butterflies (Superfamily Papilionoidea)

-Skippers (Family Hesperiidae)

-Grass Skippers (Subfamily Hesperiinae)

-Tribe Hesperiini

-Subtribe Moncina

-Genus Cymaenes

-Cymaenes isus (Fawn-spotted Skipper)


Cymaenes isus, commonly known as the Fawn-spotted Skipper, is a small butterfly in the family Hesperiidae. It is a subtle species, recognized by its warm brown (fawn-colored) wings marked with small pale spots, especially on the forewings. The upper side is typically medium to dark brown with scattered light spots, while the underside is paler brown with softer, less distinct markings, providing effective camouflage when the butterfly rests. Like other skippers, it has a compact body, hooked antennae, and quick, darting flight.

Diet

  • Adults feed on nectar from small flowers, particularly those growing in sunny clearings, grasslands, and forest edges.

  • The caterpillar's host plants are grasses (Poaceae), although detailed information on its larval biology remains limited.

  • Adults generally stay close to grassy vegetation and frequently settle on grass blades or low foliage.

Range

  • The Fawn-spotted Skipper occurs from southern Texas through Mexico and Central America to northern South America.

  • It is an occasional butterfly in the Zihua area, especially in grassy clearings, forest edges, and other open tropical habitats.

Habitat

  • It favors grassy clearings, tropical woodland edges, roadsides, pastures, stream margins, and secondary vegetation.

  • Adults generally fly low through vegetation and often settle on grass blades or nearby leaves.

  • Its subdued coloration makes it easy to overlook among dried grasses and leaf litter.

Description

  • A small skipper with a wingspan of approximately 25–32 mm.

  • The upper surface is predominantly brown, with tawny or fawn-colored scaling and small pale markings.

  • The underside of the hindwing is the most useful field character: it has a pale postdiscal band made up of separate spots divided by darker veins.

  • The brown discal area is relatively narrow and fairly straight, and a pale spot near the leading edge of the hindwing is typically connected to the basal pale area. These characters help distinguish it from the very similar Cymaenes lumina.

  • Overall, it is a rather inconspicuous grass skipper, with its delicate fawn and brown pattern blending well into its surroundings.

Fawn-spotted Skipper

Cymaenes isus

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