TL: USA, California, Mono County, Mammoth
- Local names
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| Language | Vernacular name |
 English | Friday's Blue |
- Primary hostplants
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PDO error
- Plebejus (Lycaeides) fridayi is a member of the clade Plebejus idas:
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| Species | Author |
| Plebejus anikini | Yakovlev, 2012 |
| Plebejus germani | Yakovlev, 2012 |
| Plebejus (Lycaeides) agnata | (Staudinger, [1889]) |
| Plebejus (Lycaeides) anna | (W.H. Edwards, 1861) |
| Plebejus (Lycaeides) argiva | (Staudinger, 1886) |
| Plebejus (Lycaeides) argyrognomon | (Bergsträsser, [1779]) |
| Plebejus (Lycaeides) caspica | (Forster, 1936) |
| Plebejus (Lycaeides) christophi | (Staudinger, 1874) |
| Plebejus (Lycaeides) cleobis | (Bremer, 1861) |
| Plebejus (Lycaeides) fridayi | Chermock, 1945 |
| Plebejus (Lycaeides) ganssuensis | (Grum-Grshimailo, 1891) |
| Plebejus (Lycaeides) iburiensis | (Butler, [1882]) |
| Plebejus (Lycaeides) idas | (Linnaeus, 1761) |
| Plebejus (Lycaeides) lepidus | Zhdanko, 2000 |
| Plebejus (Lycaeides) maracandica | (Erschoff, 1874) |
| Plebejus (Lycaeides) melissa | W.H. Edwards, 1873 |
| Plebejus (Lycaeides) mongolicus | (Rühl, 1893) |
| Plebejus (Lycaeides) nushibi | Zhdanko, 2000 |
| Plebejus (Lycaeides) pseudaegon | (Butler, [1882]) |
| Plebejus (Lycaeides) rogneda | (Grum-Grshimailo, 1890) |
| Plebejus (Lycaeides) roxane | (Grum-Grshimailo, 1887) |
| Plebejus (Lycaeides) samudra | (Moore, 1874) |
| Plebejus (Lycaeides) subsolanus | (Eversmann, 1851) |
| Plebejus (Lycaeides) uiguricus | Zhdanko, 2000 |
| Plebejus (Lycaeides) villai | (Jutzeler, Leigheb, Manil, Villa & Volpe, 2003) |
| Plebejus (Plebejus) bellieri | (Oberthür, 1910) |
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