Harford's Sulphur (Colias harfordii Hy. Edwards)
Wing span: 1 3/4 - 2 inches (4.4 - 5.1 cm).
Identification: Upper surface of male a rich yellow, wing bases not darkened. Cell spot in front wing is medium-sized and black, often with a white center. Forewing border wide, hindwing border narrower. Cell spot in hindwing not noticeable. Female resembles male but border less well-defined, in some cases reduced or lacking.
Life history: Males patrol open areas to find receptive females. Eggs are laid singly on the underside of host plant leaves; caterpillars eat leaves. Larvae hibernate.
Flight: Two flights from February-May and from June-August.
Caterpillar hosts: Rattleweed (Astragalus douglasii) in the pea family (Fabaceae).
Adult food: Flower nectar from thistles and mints.
Habitat: Open chaparral and woodland clearings.
Range: Southern California coastal ranges and canyons from Kern County south to San Diego County.
