426 CALIFORNIA ACADEMY OF SCIENCES. 



nate at middle. Thorax as wide as long, widest at ante 

 rior third, sides regularly arcuate, hind angles rectangular, 

 disc convex, slightly flattened posteriorly, with extremely 

 minute punctures sparsely placed. Elytra widest at mid- 

 dle, scarcely wider than the thorax, humeral angles den- 

 tiform, the extreme apices conjointly notched, surface 

 with very faint traces of striae or absolutely smooth. 

 Prosternum transversely wrinkled, the pleura? sparsely 

 finely punctate. Meso- and meta-pleuras coarsely gran- 

 ular. Abdomen sparsely finely punctate, first segment 

 more or less plicate. Legs sparsely finely punctate, the 

 tibia? rough at apical half. Length, .86-. 94 inch: 22- 

 23.5 mm. 



Male. — Anterior tibia? serrate within, the inner angle 

 prolonged. Posterior femora with a long, slender, slightly 

 curved tooth one-third from apex. 



Female. — Anterior tibia^ not serrate nor with the apical 

 angle prolonged inward. Posterior femora simple. 



This species is readily known by its very black color 

 and almost sculptureless surface. 



Santo Domingo del Taste and San Jose del Cabo. 



Cerenopus angustatus n. sp. Plate vii, fig. 9, head. 



Piceous black, rather dull, form slender. Head sparsely 

 punctate, more evident in the male, clypeus emarginate 

 at middle. Thorax as broad as long, widest slightly in 

 front of middle, sides regularly arcuate with a slight 

 sinuation posteriorly, disc regularly convex, almost ab- 

 solutely smooth along the middle becoming gradually 

 more distinctly punctate toward the sides. Elytra oblong, 

 rather acute posteriorly, humeri prominent, disc with 

 rows of coarse punctures which are large, shallow and 

 vague in the male, sharply impressed in the female, the 

 intervals vaguely convex, slightly costiform near apex. 

 Prosternum opaque with transverse wrinkles and few 



