74 PROCEEDINGS OF THE NATIONAL MUSEUM vol. ii4 



outer margin quadridentate, with the margin above and between the 

 teeth serrate or denticulate, a small pencil of hairs beside the apical 

 spine. 



Male minors. — Length 3.3 to 4.2 mm., width 2.0 to 2.4 mm. 

 Differing from the male majors in the following respects: Clypeus not 

 as extended or as reflexed anteriorly, still emarginate and bidentate; 

 disc more coarsely, heavily, setigerously punctate; clypeal carina pro- 

 nounced, straight, its length usually not more than the width of the 

 anterior clypeal emargination ; frons and genae coarsely punctate as 

 on the clypeus; carina of vertex evident, but no higher than clypeal 

 carina, very broadly V- or U-shaped, the terminal portions directed 

 anteriorly and very slightly raised, scattered coarse punctures behind 

 the carina. 



Pronotum with anterior angles less acute than in male major, ante- 

 rior projection obsolete or vaguely indicated; punctures larger, ante- 

 riorly lacking the overhanging tubercle, but with long, conspicuous, 

 whitish setae; posterior margins often less distinct than in male 

 majors. Elytra essentially similar but with smaller tubercles on the 

 intervals, the setae slightly longer in the male minors. 



Pygidium and ventral surfaces with somewhat more pronounced 

 punctures but generally similar to the male major except for the legs. 

 In the male minor the legs not lengthened, being very similar to those 

 of the females; the forefemur not extending to the pronotal margin 

 and the foretibia reduced similarly, broader, and not bent in apical 

 half. 



Females. — Length 3.4 to 5 mm., width L9 to 2.6 mm. Differing 

 from the male majors in almost the same respects as the male minors. 

 Clypeus broadly emarginate, bidentate, and scarcely reflexed ante- 

 riorly; its surface and that of the frons and genae coarsely, setigerously 

 punctate; clypeal carina as described for male minor but often slightly 

 longer; carina of vertex usually slightly higher than clypeal carina, 

 broadly U- or V-shaped with the lateral terminations slightly 

 raised, vertex behind the carina with scattered coarse punctures. 



Pronotum less convex and more heavily punctate than in male majors, 

 each puncture bearing a long, whitish seta and the anterior punctures 

 often having a small tubercle on their forward margins ; pronotal pro- 

 jection only faintly indicated by an anterior, scarcely noticeable 

 median swelling adjacent to the margin. Elytra similar to those of 

 males but with the setae and tubercles of the intervals more pro- 

 nounced. Pygidium convex, coarsely punctate with conspicuous 

 setae. Ventral setae and punctures pronounced, the smooth sm'faces 

 with the iridescent color often less than in the males. Last abdom- 

 inal segment not narrowed medially. Legs not greatly elongated, the 

 forefemora not extending to the lateral pronotal margins; the foretibia 



