Description. Male holotype. Length 2.4 mm, width 1.6 mm. Dorsal surface entirely shiny, lacking microsculpture. Color black (Fig.18); head with yellow frons, black vertex; pronotum medially black with lateral 1/4 yellow; elytron black with strong, green metallic tint; antenna and apical 2 articles of maxillary palpomere yellowish brown; basal maxillary 2 palpomeres, pronotal hypomeron and legs yellow; ventral surface black; abdomen dark brown except apically yellowish brown (Fig. 19). Head punctures small, separated by a diameter or less; pronotal punctures about as large as head punctures, separated by a diameter or less; elytral punctures larger than pronotal punctures, separated by a diameter or less; prosternal punctures coarse, separated by less than a diameter; mesosternum medially protuberant, punctures coarse, separated by less than a diameter; metasternal punctures small, separated by less than a diameter apically and ventrally; punctures on abdominal ventrites small, separated by less than 3 times a diameter. Head with sides of frons parallel from base to apex, 2.2 times as wide as eye measured at vertex; eye canthus short; apical maxillary palpomere widened from base to apex. Pronotum widest at middle, reflexed lateral margin wide from base to apex. Epipleuron flat, narrow throughout. Prosternum as long as wide, shorter than mesosternum, with apical margin slightly arcuate. Postcoxal line on ventrite 1 short, evenly rounded, extended slightly more than ½ distance to apical margin of ventrite. Apex of ventrite 5 arcuate. Genitalia with basal lobe slightly longer than paramere, slender, slightly divergent in basal 2/5 and then narrowed to rounded apex, in lateral view lobe flattened; paramere wide at base, narrowed to rounded apex, dorsal margin without serrations (Fig. 21–22); sipho slender throughout to narrow, filamentous apex (Fig. 23).

Female. Unknown.

Variation. Unknown.

Type material. Holotype male; MEXICO. 8500', 37mi. S. Valle Nacional, Oax, (Oaxaca), Mex. V. 24.1971, H. Howden. (USNM).

Remarks. This is the most distinctive species of Cephaloscymnus because of green tinted elytra and wide, yellow, lateral pronotal margin. Male genitalia are also unique within the genus.