Callophrys mossii

Callophrys mossii, commonly known as Moss's elfin, stonecrop elfin or Schryver's elfin, is a species of butterfly native to North America in the family Lycaenidae. It is found from British Columbia south to southern California and east to Wyoming and Colorado in isolated populations. The habitat consists of rocky outcrops, woody canyons and cliffs.

The wingspan is 22–28 mm. Adults are on wing from March to June in one generation per year.

The larvae feed on Sedum (including S. spathulifolium and S. lanceolatum), Sedella, Dudleya and Parvisedum species.

Subspecies
Listed alphabetically:
 * C. m. bayensis (Brown, 1939) – San Bruno elfin (California)
 * C. m. doudoroffi dos Passos, 1940 (California)
 * C. m. hidakupa Emmel, Emmel & Mattoon, 1998 (California)
 * C. m. marinensis Emmel, Emmel & Mattoon, 1998 (California)
 * C. m. mossii (Vancouver Island)
 * C. m. schryveri (Cross, 1937) (Colorado)
 * C. m. windi (Clench, 1943) (California)