CEDEMERID^ OF BOREAL AMERICA. 421 



Stenostoma, the latter having also simple mandibles, but 

 distinguished by other characters. 

 One species only is known. 



Rhinoplatia ruficollis Horn, Trans. Am. Ent. Soc, 1867, 



P- T 37- 



Form less slender than usual in Oxacis or Asclera, 

 piceous with griseous pubescence, thorax reddish yellow, 

 Head sparsely punctate at sides, smooth at middle. 

 Thorax distinctly longer than wide, sides feebly arcuate 

 in front, sinuately narrowing posteriorly, disc regularly 

 convex, surface very sparsely punctate and shining. 

 Elytra densely punctate and with very vague costae. 

 Body beneath and legs piceous, abdomen finely and 

 closely punctate, the pubescence longer than on the 

 upper surface. Length .24— .36 inch.; 6—9 mm. 



No sexual differences have been observed. 



Occurs in Owens Valley, on the east of the Sierras, 

 and in Kern County to the westward, in California. 



