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

length of head 0.93 mm, width of head 0.96 mm, length of antenna 1.65 mm. Material examined: 2 specimens, from River Toikoi, on left bank of River Lena and from River Sudsuche. The species runs in my key to thesis 37, answers to the first statement, but according to the second statement (laterotergite 8 much surpassing tip of segment 10) and to several unmentioned characters, it should be found near to the species under thesis 42. Crenaticollis differs from them in the relative length of the antenna! joints, in the proportion of the length of antenna! joint II to width of head (here 0.65, the highest among the species) and in the much longer antenna (1.75 times as long as width of head). Figs 6-10. 6-8 = Aradus crenaticollis Lg, 9-10 = A. komarowii Lg, 6 = habitus, 7 = head, 8 = tip of abdomen, 9 = head and thorax, 10 = tip of abdomen Aradus komarowii Jakovlev, 1885 Body (Fig. 11) brown with yellow and reddish markings around apodemal impressions, anteromedially on tergites and along hind margin of tergites. First three joint of antenna entirely yellow, joint IV brown. Legs yellow. Posterolateral angle of laterotergites whitish yellow. Head (Fig. 12) with acute antenniferous tubercle, latter with acute lateral tooth. Yellow ecdysal line distinct also on lateral tooth. Preocular tubercle prominent, not sharply pointed, postocular tubercle blunt. Antenna cylindrical, relative length of antennái joints I to IV as: 13:36:27:24. Rostrum almost reaching hind border of prosternum. Pronotum 3.9 times as wide as long, anterior border sinuate, lateral border slightly convex, posterolateral angle rounded. Margin finely serrate. Median carina elevated, converging to posterior direction. Abdomen with wide lateral impressions on laterotergites, their inner margin bordered by elevating yellow carinae. Border between tergites 3-6 medially inconspicuous. Lateral margin of laterotergites finely serrate. Tip of abdomen on Fig. 13.