Diagnostic characters plate 1. A Body dorsally highly convex and ventrally flattened (semicircular in cross-section (drawn after Monrós 1956) B Distal margin of last ventrite thick (drawn after Chamorro and Konstantinov 2011) C Last ventrite not excised in shape of arc D Body cylindrical, not flattened ventrally (drawn after Monrós 1953a) E body surface usually tuberculate (drawn after Monrós 1951) F procoxae prominent and contiguous G procoxae not prominent and separated H prosternal process more than 3/4 as long as intercoxal prosternal process (after Chamorro-Lacayo and Konstantinov (2009)I intercoxal prosternal process gradually constricted at about 2/3 of its length (after Chamorro-Lacayo and Konstantinov (2009).