This article relies largely or entirely on a single source .(June 2025)  | 
| Soapberry hairstreak | |
|---|---|
|   | |
|  Scientific classification   | |
| Domain: | Eukaryota | 
| Kingdom: | Animalia | 
| Phylum: | Arthropoda | 
| Class: | Insecta | 
| Order: | Lepidoptera | 
| Family: | Lycaenidae | 
| Tribe: | Eumaeini | 
| Genus: |  Phaeostrymon  Clench, 1961  | 
| Species: | P. alcestis  | 
| Binomial name | |
| Phaeostrymon alcestis  W. H. Edwards 1871  | |
 Phaeostrymon alcestis, the soapberry hairstreak, [1] is the only species of the gossamer-winged butterfly genus Phaeostrymon. It is found in southwestern United States and Mexico.