Lepidopterous Larval-Mining of an Oak(?) Leaf from the Latah Formation (Miocene) of Eastern Washington1,2

Only 1 fossil impression of larval leaf mining was encountered during investigations of the fossil insects of the Latah Formation (Miocene) of eastern Washington and northern Idaho. This partial preservation of an oak (?) leaf (Fig. 1) shows a well-formed linear type mine that closely resembles the mining scheme of extant members of the family Nepticulidae (Lepidoptera) (e.g., Needham et al. 1928, Fig. 59a,b, 63a).