Hylastes Erichson, 1836

Mandelshtam, M. Yu. & Petrov, A. V., 2019, A key to species of the tribe Hylastini LeConte, 1876 (Coleoptera: Curculionidae: Scolytinae) from Russia and adjacent countries, Russian Entomological Journal 28 (4), pp. 389-399 : 390

Genus Hylastes Erichson, 1836

In Russia and neighboring countries (in borders of the former USSR) 10 species are recorded. Out of these, H. parallelus Chapuis, 1875 is unknown to us and therefore not included in the key. It is apparently closely related to H. ater (Paykull, 1800) and H. brunneus (Erichson, 1836) according to Murayama [1962], but differs from these by the widely rounded, not nearly rectangular, basal angles of pronotum, the very large and shallow punctures on elytral striae, and narrow interstriae. The structure of ventrite 5 in the male in H. parallelus is undescribed in literature. Nobuchi [1969] made notes on the proventriculus of but without illustrations. This description did not allow us to establish differences between H. paralellus and H. brunneus .