Acta Zoologica Cracoviensia, 21() 1976
Notes on Intraspecific Variation and Sexual Dimorphism of Some Palaearctic Species in the Genus Hylastes Er. (Col., Scolytidae)
Abstract:
The authors present results of their studies on individual variation and sexual dimorphism of some Palaearctic species in the genus Hylastes Er. (H. ater Payk., H. brunneus Er., H. cunicularius Er., H. opacus Er., H. attenuatus Er., H. angustatus Herbst). Results of a mathematical analysis permit to state that the use of the pronotal and elytral ratios of length to breadth gives no certainty in the identification of the mentioned species. The present studies, however, permitted to find characters, with the use of which it is possible to identify certainly species and sex in the group of large bast bark beetles and species in the group of small bast bark beetles. On the basis of essentially distinguishing characters the key for the identification of the studies species has been worked out.
