S. Mahunka szerk.: Folia Entomologica Hungarica 47/1-2. (Budapest, 1986)

Figs 17-22. Aradus brenskei. 17 = habitus of Lg, 18-19 = tip of abdomen of Lg, 20 = head of L

; 21 = head of L 22 = tip of abdomen of L Measurements: total length of body 4.0 mm, length of head 0.88 mm, width of head 0.82 mm, length of antenna 1.22 mm. Fifth instar larvae of 6 species of the betulae-group (species described here and those, under thesis 7 in my key) can be separated by the following key: 1 (4) Anterolateral angle of laterotergites with a prominent tooth (Fig. 17). Disc of pronotum (median carinae and reverse U shaped callosities) highly elevated. Antennái joint II thickening towards apex along the whole length. Length of joint II more than 0.7 times that of head width. The two species are difficult to distinguish. 2 (3) Basic colour yellow, with brown and reddish markings. Posteromedian part of pronotum between mediolateral carinae concolorous with the posterolateral part, or with 2 darker spots. Brown markings less extended on the whole body brenskei