Cybister laevis Falkenstrom 1936

Cybister laevis Falkenström, 1936 (Figs 5A–C; 20A) Cybister laevis Falkenström, 1936: 243 (orig. descr.). Cybister tripunctatus var. laevis: GSCHWENDTNER (1938: 64). Type material. HOLOTYPE: ♀ (NHRS), labelled: “Giufu-Shan [Chongqing, Jinfoshan Mt.] / Szechuan / Em. Reitter [p] // Cybister ♀ / laevis / Falk. [hw] / det. Falkenström [p] // Typus [red label with black frame, p] // 7533 / E91 + [blue label, p] // NHRS-JLKB / 000073974 [p]”. Diagnosis. See Cybister tripunctatus lateralis. Ventral side yellowish. Comments to classification. The female type specimen has smooth elytra without any striolae – a condition which can be observed also in all females of C. tripuncatus lateralis. Since it is an odd, old museum specimen, it has a yellowish ventral side, which is not the case for C. tripunctatus lateralis from China, where the ventral side is always black or ferruginous in freshly hatched specimens. The size (26 mm) and the coloration of the dorsal side also indicate that C. laevis is conspecific with the variable and widespread C. tripunctatus lateralis, as already suggested by GSCHWENDTNER (1938). Distribution. China (Chongqing) (Fig. 20A).
Published as part of Jiang, Zhuo-Yin, Zhao, Shuang, Mai, Zu-Qi, Jia, Feng-Long & Hendrich, Lars, 2023, Review of the genus Cybister in China, with description of a new species from Guangdong (Coleoptera: Dytiscidae), pp. 75-102 in Acta Entomologica Musei Nationalis Pragae 63 (1) on page 80, DOI: 10.37520/aemnp.2023.003, http://zenodo.org/record/7887332
{"references":["FALKENSTROM G. 1936: Halipliden, Dytisciden und Gyriniden aus West- und Zentral-China (Coleoptera). Lingnan Science Journal 15: 225 - 248.","GSCHWENDTNER L. 1938: Monographie der palaarktischen Dytisciden. IX. Dytiscinae. Koleopterologische Rundschau 24: 33 - 76."]}