Leptidea amurensis japona Verity, 1911

ANTENNAL CLUB (Figs. 8, 9a, b). The scaleless club is 541.7 µm in length.

ANTENNOMERES (Fig. 9 a–d). This species has four scaleless antennomeres, and the distal two are fused; they are depressed, and the maximum ratio (l:w) is 1:5.

SULCI AND PSEUDOSULCI (Fig. 9 a-e). There are 3–4 central and 8 lateral, which extend toward the dorsal surface from the second antennomere. There are sulci in the basal antennomere, and they are irregular; the central ones are longer than wide, and the laterals are wider than long. The central sulci occupy the length of antennomere, forming a continuous groove.

MICROTRICHIA (Fig. 9f, h–k). There are microtrichia m1, m2, and m4. The st:m1 ratio in the central sulci is 1:2 and 1:3.5.

TRICHOID SENSILLA (Fig. 9f, g). The number of trichoid sensilla in the central sulci is variable: 16–52 for a total of 108 in one specimen, and 11–38 for a total of 84 in another specimen.

CHAETIC SENSILLA (Fig. 9h). These sensilla average ca. 31 µm in length. On the ventral surface there are up to four sensilla per antennomere; those around to the central sulcus are located toward the middle part of the antennomere. There are a similar number of sensilla on dorsal surface, but without any order, and they are located toward the distal edge of the antennomere.

BASICONIC SENSILLA (Fig. 9i). Basiconic sensilla are present on the ventral surface, although they are not abundant; there are few or none on the dorsal surface.

AURICULATE SENSILLA (Fig. 9k, l). The auriculate sensilla are distributed with the basiconic sensilla and sometimes in the periphery of the sulci.

COELOCONIC SENSILLA (Fig. 9 j). The sensilla sc1 are abundant on the ventral surface and frequent on the dorsal surface.