Based on laboratory reared material, a descriptive key is presented of the ultimate instar larvae (exuviae) of 8 spp., viz. albistylum (Sel.), anceps (Schneider), brunneum (Fonsc.), cancellatum (L.), chrysostigma (Burnt.), coerulescens (Fabr.), nitidinerve (Sel.) and trinacria (Sel.). The previous descriptions are critically discussed, and some additional structural features for species separation are stated.