Pseudolycaena marsyas
Specimen of Pseudolycaena marsyas from Guyana
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Lepidoptera
Family:	Lycaenidae
Subfamily:	Theclinae
Tribe:	Eumaeini
Genus:	Pseudolycaena
Species:	P. marsyas
Binomial name
Pseudolycaena marsyas (Linnaeus, 1758)
Synonyms
Papilio marsyas Linnaeus, 1758 Pseudolycaena marsyas Linnaeus, 1758 by Wallengren, 1863 Thecla cybele Godman & Salvin, 1896 Thecla dorcas Druce, 1907 Pseudolycaena marsyas nellyae Lamas, 1981

Pseudolycaena marsyas, the Cambridge blue, giant hairstreak or Marsyas hairstreak, is a species of butterfly in the family Lycaenidae.

Pseudolycaena marsyas has a wingspan of about 40–50 millimetres (1.6–2.0 in), a quite huge size in hairstreaks (hence the common name "giant hairstreak"). The uppersides of the wings are usually metallic blue, with hues varying from cobalt blue to turquoise blue depending on location. The apex of the wings are black and lightly falcade in males and the hindwings are tailed in both sexes, with a small black spot. The undersides of the wings are pale blue greyish, with several black spots and thin markings.

This wide-ranging species occurs in Central and South America from Mexico up to Argentina, in semi-open forests at an elevation of about 0–1,000 metres (0–3,281 ft) above sea level.

Many forms varying in the hue of the blue but these are allocated to a single subspecies - Pseudolycaena marsyas marsyas.

• Austin, G.T. ; L.D. Miller & J.Y. Miller, 2007: Taxonomic comments on Pseudolycaena Wallengren (Lepidoptera: Lycaenidae: Theclinae: Eumaeini). Bulletin of the Allyn Museum 149: 1-22.
• "Pseudolycaena Wallengren, 1858" at Markku Savela's Lepidoptera and Some Other Life Forms

• Learn about butterflies
• Butterflies of America

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