The Xerces blue is a recently extinct species of butterfly in the gossamer-winged butterfly family, Lycaenidae. The species lived in coastal sand dunes of the Sunset District of the San Francisco Peninsula in California. The Xerces blue is believed to be the first American butterfly species to become extinct as a result of loss of habitat caused by urban development. The last Xerces blue was seen in 1941 or 1943 on land that is now part of the Golden Gate National Recreation Area.
The Palos Verdes blue is a small endangered butterfly native to the Palos Verdes Peninsula in southwest Los Angeles County, California, United States. As its distribution has been proven to be limited to one single site, it has one of the best claims to being the world's rarest butterfly.
Coenonympha is a butterfly genus belonging to the Coenonymphina, a subtribe of the browns (Satyrinae). The latter are a subfamily of the brush-footed butterflies (Nymphalidae). As a rule, Palearctic species are colloquially called heaths, while Nearctic ones are called ringlets. Neither term is limited to members of this genus, however.
Speyeria zerene, the zerene fritillary, is a butterfly found in the western portions of the United States and Canada. The species was first described by William John Swainson in 1827.
Lycaena phlaeas, the small copper, American copper, or common copper, is a butterfly of the Lycaenids or gossamer-winged butterfly family. According to Guppy and Shepard (2001), its specific name phlaeas is said to be derived either from the Greek φλέγω (phlégo), "to burn up", or from the Latin floreo, "to flourish".
Anthocharis is a holarctic genus of the butterfly tribe Anthocharini, in the family Pieridae. These are typically small, white-hued butterflies that have colorful marks just inside the tips of the forewings. The tip colors are usually a red-orange hue, hence the name "orange tip". The larvae of these butterfly often consume cruciferous plants containing chemicals called glucosinolates. This genus is characterized by two of the five subcostal veins branching off before the apex of the cell, by the upper radial being only little united with the subcostal, and by the central discocellular being rather long. In all the species the males have at least the apical portion of the forewing orange red or yellow. Only one species inhabits also the northern districts of the Palearctic region, all the others are found in the south of the Palearctic region, also some species occur in North America, but not one species extends into the tropics. The Anthocharis species have only one brood. The butterflies occur in spring.
The genus Satyrium contains butterflies in the family Lycaenidae. The species of this genus are found in the Holarctic ecozone. For distribution information see Further reading "Le genre Satyrium".
Plebejus is a genus of butterflies in the family Lycaenidae. Its species are found in the Palearctic and Nearctic realms.
Plebejus idas, the Idas blue or northern blue, is a butterfly of the family Lycaenidae. It belongs to the subfamily of Polyommatinae.
Glaucopsyche lygdamus, the silvery blue, is a small butterfly native to North America.
Agriades glandon, the Arctic blue or Glandon blue, is a species of butterfly in the family Lycaenidae. It in found in Eurasia and North America.
Icaricia icarioides, or Boisduval's blue, is a butterfly of the family Lycaenidae found in North America. This butterfly has 25 recognized subspecies.
Euphilotes battoides, the square-spotted blue or buckwheat blue, is a species of butterfly of the family Lycaenidae.
Celastrina echo, known generally as the echo azure or western azure, is a species of blue in the butterfly family Lycaenidae. Celastrina echo have been observed in mostly western regions of the United States, including California, Oregon, Arizona, New Mexico, and Montana.
