418 CALIFORNIA ACADEMY OF SCIENCES. 



Oxacis dubiosa n. sp. 



Form slender, piceous, thorax paler at apex and base; 

 suture narrowly pale. Antennae piceous to parti-colored, 

 usually darkest at base. Head somewhat variable in 

 color, from piceous to partly yellow, moderately coarsely 

 punctate. Thorax longer than wide, sides feebly arcu- 

 ate in front, slightly narrowed to base, disc regularly 

 convex, moderately coarsely and densely punctate, color 

 variable. Elytra moderately densely punctate, without 

 costae, with fine grayish pubescence. Body beneath 

 piceous, finely punctulate. Femora at basal half yellow, 

 tibia? and tarsi piceous. Length .20-. 24 inch; 5-6 mm. 



The thorax is more or less piceous, the apex and base 

 always paler. Specimens occur with the thorax reddish 

 yellow, with a broad well defined piceous transverse band 

 at the anterior third, the apical edge being reddish. 



San Jose and San Lazaro, Baja California. 



Oxacis sericea Horn, Trans. Am. Ent. Soc, 1870, p. 89. 



Piceo-testaceous, densely' clothed with grayish white 

 pubescence entirely concealing the surface. Antennae 

 pale. Head moderately densely punctate. Thorax as 

 wide as long, sides rather strongly arcuate in front, nar- 

 rower posteriorly, disc slightly irregular, closely, finely 

 punctate, color testaceous with an indistinct piceous vitta 

 at middle and a small spot each side. Elytra piceo-tes- 

 taceous usually, with a paler suture and side margin, 

 surface closely and finely punctate, without trace of 

 costae. Body beneath darker than above, finely punctu- 

 late and densely pubescent. Legs pale. Length .20-. 36 

 inch. ; 5—9 mm. 



This species resembles superficially sororia, but differs 

 in the entire absence of elytral costae and a [different 

 form of maxillary palpus. 



Occurs in Nevada and southward to Owens Valley. 



