| Erynnis (Erynnis) mercurius (Dyar, 1926) |
| Mexico |  |
| 28 mm | |
 Mexican Duskywing |
Erynnis (Erynnis) mercurius 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) |