Phaeostrymon alcestis, the soapberry hairstreak, is the only species of the gossamer-winged butterfly genus Phaeostrymon. It is found in southwestern United States and Mexico.

Soapberry hairstreak
Scientific classification
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Phaeostrymon

Clench, 1961
Species:
P. alcestis
Binomial name
Phaeostrymon alcestis
Phaeostrymon alcestis antenna