Males are typically a solid, bright yellow while females are yellow with a black border on the wings and single or double pink-ring around a silver spot in the hindwing center. Eggs: The eggs are cream colored when laid but later turn to orange. Subject: Cloudless Sulphur Caterpillar in Mount Washington Location: Mount Washington, Los Angeles, California February 28, 2016 We were shocked to see this bright yellow caterpillar meandering across the patio. Identification: Upper surface of male is lemon yellow with no markings. Cloudless Sulphur caterpillars that eat green leaves of their host plant (Cassia and Senna plants) are green while caterpillars that eat the flowers of their host plant are the color of the flowers. We immediately recognized a Cloudless Sulphur Caterpillar, Phoebis sennae, but we do not have any Cassia growing anywhere near. Unfortunately, this causes many farmers and gardeners to rip the plants out. These butterflies migrate from breeding grounds in the northern U.S. to overwintering grounds in the southern U.S. each year. Eggs: The eggs are cream colored when laid but later turn to orange. There are a number of native and non-native host plants for cloudless sulphur caterpillars. Cloudless Sulphurs specialize on pea family members, primarily Sennas and closely related plants like Partridge Pea (Chamaecrista fasciculata) and Wild Sensitive-plant (C. nictitans) as food plants for their caterpillars. Female is yellow or white; outer edges of both wings with irregular black borders; upper forewing with dark spot in cell. It doesn’t seem big enough to be a Cloudless Sulphur, which is most often mentioned as using wild senna as larval plant food. Shown below is a comparison chart of commonly seen Sulphur Butterflies. Part of the fun is that the markings on a caterpillar after it turns to yellow are different than when it was green. At Bowman’s Hill Wildflower Preserve the Cloudless Sulphurs seem to prefer Wild Senna (Senna hebecarpa, S. marilandica). Egg of the cloudless sulphur, Phoebis sennae (Linnaeus). Cloudless sulphur butterflies are found in open areas in the Mississippi Delta. Cloudless Sulphurs specialize on pea family members, primarily Sennas and closely related plants like Partridge Pea (Chamaecrista fasciculata) and Wild Sensitive-plant (C. nictitans) as food plants for their caterpillars. Cloudless Sulphur (Phoebis sennae) This lovely yellow butterfly is one of the larger sulphurs. We immediately recognized a Cloudless Sulphur Caterpillar, Phoebis sennae, but we do not have any Cassia growing anywhere near.

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