S. Mahunka szerk.: Folia Entomologica Hungarica 55. (Budapest, 1994)

Holotype (male): [Croatia], Ludbreg, [leg.] Apfelbeck; paratype (male): [Spain], Mataelpino (Madrid), 3-X-1981, M. Ortego leg. The types are deposited in the Department of Zoology of the Hungarian Natural History Museum, Budapest. Trox cricetulus sp. n. may be distinguished from the closely related species (77. hispidus and T. niger) by the following key. 1 (2) Size of largest tubercles of even intervals about one-quarter, one-third or half the size of tubercles of odd intervals, with 1 or 2 (rarely 3) setiferous punctures. - Tubercles of odd intervals flat or slightly convex, with one, more or less regular row of 2-8 (most often of 3-6) setiferous punctures at posterior margin. Male genitalia: Fig. 1. Trox cricetulus sp. n. 2(1) Tubercles of even intervals small, granuliform, having 1 (rarely 2) or without setiferous punctures. 3 (4) Tubercles of odd intervals flat or slightly convex, with one, more or less regular row of 2-9 (most often of 2-6) setiferous punctures at posterior margin. Tubercles of even intervals small, most often with 1 setiferous puncture (rarely having 2, sometimes without setiferous punctures). Male genitalia: Fig. 2. Trox hispidus (Pontoppidan, 1763) 4 (3) Tubercles of odd intervals slightly or strongly convex, with a group of 3-18 (most often of 5-9) setiferous punctures in one or two rather irregular rows at posterior margin. Tubercles of even intervals very small, most often without setiferous punctures (sometimes with 1 setiferous puncture). Male genitalia: Fig. 3. Trox niger Rossi, 1792 Figs 1-3: Male genitalia (in dorsal view) of Trox cricetulus (1), T. hispidus (2) and T. niger (3) Folia ent. hung. 55, 1994