Home / Gossamer-Winged (Lycaenidae) / Gray Hairstreak (Strymon melinus)

Gray Hairstreak (Strymon melinus)

Gray Hairstreak cdn.butterflyatlas.org

The Gray Hairstreak is a species of butterflies common in almost entire North America and is very common throughout their range. The tiny butterflies belong to the hairstreak group and are often tended by ants in their host plants from which they can very easily be identified.

Scientific Classification

  • Family: Lycaenidae
  • Genus: Strymon
  • Scientific Name: Strymon melinus

Description and Identification


Gray Hairstreak Butterfly Caterpillar c1.staticflickr.com

Gray Hairstreak Caterpillar bugguide.net

The caterpillars are green, with a line running down from the head to the end. Young caterpillars live on flowers and fruits, while the older ones (at the final stage) may consume leaves. The flowers and fruits are chosen from innumerable varieties of plants especially from pea (Fabaceae) and mallow (Malvaceae) families that include beans (Phaseolus), clover (Trifolium), and cotton (Gossypium).


Gray Hairstreak Butterfly Chrysalis static1.1.sqspcdn.com

Gray Hairstreak Chrysalis cdn.butterflyatlas.org

The pupa has a shelled-groundnut-like shape and color, with fine velvety protrusions all over the body. It takes around 7-10 days to emerge into a butterfly. However, it would enter hibernation if the stage coincides with the winter.

Adult Butterfly

Sexual Dimorphism: Vaguely present

Color and Appearance: When the wings are open, the dorsal side displays a bright blue-gray coloration with a large red spot near the ends. When the wings are closed, the color of the ventral side during spring and fall is dark gray, while during summer, the color turns paler. The white postmedian line is relatively straight with an orange border on the inside edge. Each of the hind wings has a small tail-like protrusion that, by adaptation, looks almost like the antenna, while they render a head-like appearance on the wingtip in order to confuse predators. When the wings are closed, the ventral side shows a similar appearance as the dorsal. The female butterflies are relatively pale and shorter than the males.

Gray Hairstreak Butterflies naba.org

Gray Hairstreak Butterfly leps.thenalls.net

Average wingspan: 7/8 – 1 3/8 inches (2.2 – 3.5 cm)

Flight pattern: Fast and erratic


Gray Hairstreak Butterfly Eggs cdn.butterflyatlas.org

Laid singly on flowers of host plant

Quick Facts

Distribution Almost in the entire North American continent, Central America, down to the northern regions of South America
Habitat Commonly found in disturbed, weedy areas, open lands devoid of dense vegetation
Lifespan of adults 3-4 weeks in an average
Host plants In Central America: Passionflower species Passiflora oerstedii and Passiflora menispermifolia

Elsewhere: Various passion flower species

Adult diet Nectar several flower species, mainly mint, winter cress, sweet white clover, dogbane, milkweed, goldenrod, and tick trefoil

Did You Know?

  • In some regions within their habitat, the caterpillars are considered as pests, since they often cause economic damage to crops like cotton, bean, etc.

Gray Hairstreak Butterfly Host Plant transmutationalgarden.files.wordpress.com

Gray Hairstreak Images butterfliesandmoths.org

Strymon melinus learnaboutbutterflies.com

Leave a Reply

Your email address will not be published. Required fields are marked *

Scientific Classification

  • Family: Lycaenidae
  • Genus: Strymon
  • Scientific Name: Strymon melinus
Published by Poppy Glendening on October 20, 2018.
Last Updated: October 15, 2023. ✅ Verified by: Butterfly Team