| Erynnis (Erynnides) tristis (Boisduval, 1852) |
| USA, California
|  |
| 32 - 49 mm | |
 Mournful Duskywing |
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Synonyms and other combinations | |
| Thanaos tristis | Boisduval, 1852 |
| Thanaos tatius | Edwards, 1883 |
| Thanaos albomarginatus | Godman, 1899 |
Erynnis (Erynnides) tristis is a member of the clade Erynnis juvenalis | |
| Species | Author |
| Erynnis (Erynnides) horatius | (Scudder & Burgess, 1870) |
| Erynnis (Erynnides) juvenalis | (Fabricius, 1793) |
| Erynnis (Erynnides) meridianus | Bell, 1927 |
| Erynnis (Erynnides) scudderi | (Skinner, 1914) |
| Erynnis (Erynnides) telemachus | Burns, 1960 |
| Erynnis (Erynnides) tristis | (Boisduval, 1852) |
| Erynnis (Erynnis) mercurius | (Dyar, 1926) |