Longitarsus aff. holsaticus (Linnaeus, 1758)

Fig. 4 A – G

Note.

Whereas six collected specimens were tentatively identified as this species, more specimens and further taxonomic studies are necessary.

Host plant.

Plantaginaceae: Pennellianthus frutescens (Lamb.) . Host plants of Longitarsus holsaticus are reported to be Veronica spp. by Kimoto and Takizawa (1993).

Leaf mine.

Full-depth linear or radiate mine in young leaf (Fig. 4 F – G). Frass is deposited compactly in a few parts of the mine, and sometimes discharged from the mine through holes perforated along the mine edge. The fully grown larva exits the mined leaf, falls to the ground, and pupates underground.

Material examined.

• 6 adults, Mt. Tarumai, Chitose, Hokkaidô, 4-VII-2010 (as larva on Pennellianthus frutescens), emerged on 17-VIII-2010 (Fig. 4 A – G) .