Butterflies and Moths of North America

collecting and sharing data about Lepidoptera

Oslar's eacles
Eacles oslari Rothschild, 1907

Family: Saturniidae
Subfamily: Ceratocampinae
Identification: Upperside is yellow with purple-brown lines and cell spots. Males have an orange-brown form and females have a brownish form. Underside of both sexes has prominent brown bands on both wings; forewing band runs from the wing tip to the inner margin, hindwing band runs diagonally from the costa to the inner margin.
Wing Span: 4 7/16 - 5 3/4 inches (11.2 - 14.6 cm).
Life History: Egg laying begins after sunset and females deposit eggs singly or in groups of 2-6 on host plants. Caterpillars are solitary feeders, and when they are mature they pupate in underground burrows.
Flight: One flight from July-August.
Caterpillar Hosts: Mexican blue oak (Quercus oblongifolia), Emory oak (Q. emoryi), western soapberry (Sapindus saponaria drummondii) and others.
Adult Food: Adults do not feed.
Habitat: Oak woodland in the Sierra Madre.
Range: The Santa Rita, Patagonia, Atascosa, and Huachuca Mountains of southern Arizona south into Sonora, Sinaloa, and Chihuahua, Mexico.
Conservation: Not usually required.
NCGR: G5 - Demonstrably secure globally, though it may be quite rare in parts of its range, especially at the periphery.
Management Needs: None reported.
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