The small size and oval form distinguish this sp. from Epilachna varivestis
(> 6 mm) and E. borealis
(>7 mm) which occur in the same geographic region.(2)
The row of basal spots on S. vigintiquatuorpunctata
appears to always curve upward, where as for Epilachna
the basal row appears to curve downward or at best uncurved.