Description. Head. Anterior border of labrum concave, anterior angles rounded. Frontoclypeal suture generally lacking between internal tubercles but superficially completely marked in some specimens from the Sierra de los Cuchumatanes. Frontal ridges absent or present, internal tubercles present and distinct. Median frontal structure (MFS) with short center horn, apex not free; lacking setae on each side of horn. Ligula between insertions of labial palpi, wide, concave or flat, lacking medial setae, anteriorly triangular; surface shiny. Lateral lobes of mentum with longitudinal central tumosity or ridge; center of mentum anteriorly triangular and unilobate (some specimens with indentation). Last segment of labial palpus large, 1/2 or slightly more than 1/2 length of second segment. Dorsal mandibular tooth small to medium, with acute angle in lateral view, aspect of mandibles in ventral view rounded, external part of mandible with ventral keel. Thorax: Pronotum shiny and smooth, lateral fossae lacking setae and punctation. Scutellum with small punctate setae. Mesosternum with setae on posterior sides, mesosternellum moderately setose posteriorly. Metasternal disk delimited partially or totally by setose punctation, marginal groove narrow. Elytra: Shiny and smooth; elytral striae marked with superficial and weak punctation. Setae presents only on humeri and anterior margin. Legs. Mesotibiae with two (sometimes three) spines on external border (one in some old specimens). Dimensions: (mm) (n = 18). Total length 53.95-79.30, 0=66.44; elytral length 28.75-39.20, 0=34.07; pronotal length 13.00-22.35, 0=17.71; pronotal width 19.00-29.10, 0=23.83; elytral width 18.95-28.65, 0=23.89; head width 16.00-23.00, 0=19.54.