Wing span: 3.5 to 3.8 cm

Flight time: Horace's Dustywing appears to be triple-brooded in Iowa, with the first brood flying from late April to early May, the second from early June to late July, and the third from mid August to early September.

Status: Uncommon breeding resident.

Distinguishing features: Erynnis horatius is close to E. juvenalis in appearance but is more uniformly brown and lacks the two sub-apical pale spots on the lower hindwing. The bulk of its flight occurs during the summer months; long after E. juvenalis has passed. Both of these species are larger than E. baptisiae and E. lucilius.

Distribution and habitat: This species is scattered and rare throughout the state. No clear habitat preferences have been noted, as it has been encountered from a wide variety of natural and altered habitats. In western Iowa it may be more common along oak-lined stream corridors.

Natural History: Although E. horatius has a wide distribution in the U. S., MacNeil (in Howe, 1975, p.525) notes that it is "almost absent from the Great Plains." Its larvae have been reported to eat various oak species.

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