| Hypostrymon Clench, 1961 |
| Hypostrymon aderces Clench, 1975 |
| Hypostrymon asa (Hewitson, 1868) |
| Hypostrymon critola (Hewitson, 1874) |
| Hypostrymon ines Scott, 1986 |
| Hypostrymon margaretae Clench, 1975 |
| Hyreus Hübner, 1819 |
| Hyreus thius Geyer, 1832 |
| Iaspis Kaye, 1904 |
| Iaspis andersoni Robbins, 2010 |
| Iaspis castimonia (Druce, 1907) |
| Iaspis purpurata Austin & K. Johnson, 1996 |
| Iaspis temesa (Hewitson, 1868) |
| Icaricia Nabokov, [1945] |
| Icaricia acmon (Westwood, 1851) |
| Icaricia lupini (Boisduval, 1869) |
| Icaricia lupini subsp. texanus (Goodpasture, 1973) |
| Ignata K. Johnson, 1992 |
| Ignata gadira (Hewitson, 1867) |
| Ignata illepida K. Johnson, 1992 |