394 CALIFORNIA ACADEMY OF SCIENCES. 



and deeply punctured. Apex of clypeus reflexed, acutely 

 emarginate, the angles acute. Thorax coarsely sparsely 

 punctate, smoother at sides and base. Elytra coarsely 

 sparsely and irregularly punctate. Body beneath sparsely 

 punctate and hair}'. Length .14-. i6 inch; 3.5-4 mm. 



Male. — x\nterior tibia without spur. Pygidium vertical 

 or slightly inflexed, regularly convex, clothed with whitish 

 hair. 



Female. — Anterior tibia with spur. Pygidium oblique, 

 rather deeply impressed each side near the apex, surface 

 quite smooth. 



Collected by Dr. Edw. Palmer at St. George, Utah. 



The three species of Chnaunanthus may be separated 

 in the following manner: 



Surface quite shining. Clypeal teeth obtuse. Pygidium of female con- 

 cave near apex. discolor. 

 Surface dull. Clypeal teeth acute. Pygidium of female bi-impressed. 



Palmeri. 

 Surface moderately shining. Clj'peal teeth moderately acute. Pj'gidium 

 of female Avith a single imiDression near the tip. Elj'tra bright yellow. 



Jlavipennis. 



Oncerus convergens n. sp. 



Facies of ChinuoiaiUhns, piceous, eh'tra dull yellow. 

 Head coarsely, deeply and moderately closely punctured, 

 sides of clypeus convergent. Thorax broader than long, 

 slightly wider at base than apex, sides regularl}^ arcuate, 

 disc moderately convex, coarsely not closely but regularly 

 punctate. Elytra slightly wider than the thorax, irreg- 

 ularly but not closely punctate. Body beneath sparsely 

 punctate. Front and middle legs yellowish, posterior 

 legs piceous. Surface above and beneath sparsely hairy. 

 Length, .14 inch; 3.5 mm. 



In the nine specimens examined no sexual peculiarities 

 have been observed. 



Calmalli Mines. 



