Cephennium aridum Hopp & Caterino 2009

Description. Male. Length: 0.817–0.912 mm; pronotal width: 0.304–0.342 mm; elytral width: 0.352–0.418 mm. Body elongate, slender, weakly convex; amber-yellow, translucent; evenly and moderately pubescent; pubescence golden, slender, moderately long, weakly decumbent (Fig. 1H). Dorsal surface of head smooth, sparsely pubescent, narrowing anteriorly from antennal insertions. Single ommatidium present on each side of head (Fig. 4D). Antenna setose, antennomeres I and II longer than broad, antennomeres III-VI quadrate and smaller than antennomeres II and VII, antennomere VIII smaller than antennomeres VII and IX, antennomeres IX-XI gradually clavate forming a loose club. Pronotum moderately pubescent, broadest between middle and anterior third, very convex in disc part and moderately flattened near each posterior angle; anterior margin not visible from above; anterior and posterior margin lacking marginal bead; marginal bead complete laterally, gradually widening towards base; lateral edge broadly rounded to posterior third, then weakly sinuate to base (Fig. 1H). Hypomeron smooth, sparsely setose towards anterior quarter and along outside (lateral) edge. Prosternum with small, weakly protruding, oblique narrowly ovate nodules anterolaterad procoxal cavities (Fig. 2H). Elytra smooth, lacking striae, as pubescent as pronotum, covering all abdominal segments; elytral suture absent; basomedial fovea present on each elytron; fovea small, moderately pubescent (Figs. 1H, 3H). Humeral angle of elytron projecting laterally to sharp point (Fig. 3H). Scutellum weakly triangular, lacking setae (Fig. 3H). Mesosternal keel sparsely setose, with scale-like microsculpture over most of its length, abruptly smooth in posterior extreme, apex moderately bifid, divergent projections short, diverging at ~90° angle (Fig. 2H). Metathoracic wings vestigial. Femora strongly clavate in distal half; tibiae expanded and becoming more densely setose towards distal half. Five visible abdominal sternites, ventrites V and VI largely fused. Aedeagus with median lobe bulbous, heavily sclerotized, truncate at apex, with very short median dorsal process, weakly emarginate for reception of apex of apical digiform process; apical collar not apparent; dorsal parameres slender, extending well beyond end of median lobe, each with two subapical setae (Fig. 1H).
Female. Unknown.

Distribution. This species is known from several localities in the far northeastern Colorado desert, in San Bernardino and Riverside Counties, CA (Fig. 6).