Erbessa stroudi

The length of the forewings is 16–18.5 mm for males and 16.5–18.5 mm for females. It is extremely similar to E. regis, but can be told apart from that species by the uniform yellow on both the forewings and hindwings, a longer yellow central streak on the hindwing, and the differing shape of the yellow triangle near the base of the forewing. Additionally, these two species are widely separated in their ranges, with E. regis being native to Ecuador, Peru, and Bolivia, compared to the Costa Rican endemic E. stroudi.

Erbessa stroudi is endemic to Costa Rica, where it is widespread in lowland and submontane forests. It inhabits the Cordillera Central mountain range from the Caribbean shore of Costa Rica almost to the Pacific coast. It is known from nearly sea level up to an elevation of 1,100 m (3,600 ft). Caterpillars feed on Eugenia valerii in the family Myrtaceae, which is unique within its genus; most Erbessa species seem to feed on Melastomataceae.

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