364 CALIFORNIA ACADEMY OF SCiENCES. 



outer joints darker. Elytra finely and moderately closely 

 punctate. Metasternum and first ventral segment sparsely 

 finely punctulate. Length, .10 inch; 2.5 mm. 



This form is related to -piinctulatiiin, but differs from all 

 our species by its coloration. In the specimens examined 

 there is uniformity except that the thorax may be some- 

 what darker than at the sides. 



La Chuparosa. 



Saprinus opacus n. sp. 



Broadly oval, convex, black, opaque, punctured. 

 Head densel}'' punctate, front not margined. Thorax 

 densely punctate, very slightly strigose at the sides. Elytra 

 opaque, punctures smaller than those of the thorax and 

 less closely placed, especially in the circum-scutellar re- 

 gion; sutural striae extremely fine, obliterated at basal 

 third, dorsal striae four, the outer side of each raised in 

 a fine carina, the first longer, arcuate and nearly entire, 

 second and third shorter, fourth much shorter and with 

 a distinct arch at base ; internal subhumeral short, oblique, 

 the outer long and fused with the marginal. Pygidium 

 closely punctate like the thorax. Prosternum nearly flat, 

 the stride sinuous, but gradually convergent in front with- 

 out quite uniting. Metasternum at sides coarsely punc- 

 tate, at middle and the abdomen sparsely finely punctate. 

 Anterior tibiae 7-denticulate. Length, .14 inch; 3.5 mm. 



This peculiar species will be referred to Group ii, as 

 defined by Leconte, but is one of those exhibiting the 

 difficulty attending the Marseul system of subdivision. 

 From all the species known in our fauna with immarginate 

 front this one may at once be known by its opaque and 

 punctate surface, the nearly flat prosternum with con- 

 vergent strijE. 



One specimen. San Jose del Cabo. 



