Scaralina metcalfi is a species of planthopper in the family Fulgoridae. It is found from Arizona in the United States south to the Sierra Madre Occidental in Mexico.[1] It is one of four species (the others being Scaralina aethrinsula, Scaralina cristata, and Scaralina marmorata) that were, for several decades, erroneously grouped together under a single name, Alphina glauca; this name is now treated as a synonym of S. marmorata.[1]
Scaralina metcalfi typically occurs at higher elevations, above 1000 meters, and is associated with oaks (Quercus spp.).[1] Of the three co-occurring species in the area where it is found, it is much rarer than the other two species, and may feed on a rarer host oak species.[1]
Scaralina metcalfi is found in a subset of the Madrean Sky Islands in Arizona down into Chihuahua.[1] In Arizona, its range is overlapped by the ranges of Scaralina aethrinsula and Scaralina cristata, and all three species can be found together.[1]