194 AMERICAN COLEOPTERA. 



G2. Basal joint of antennal funicle much longer and somewhat 

 wider than the second. 

 Hi. Elytral setae longer and more abundant than usual, pale 

 brownish testaceous in color, scales uniformly cinereous 

 throughout. 13-20 mm. Winslow, Arizona. 



wickliami Sharp. 



H2. Elytral setae much sparser and shorter, silvery white in color. 



I'. Prothorax coarsely punctate, widest anteriorly ; scaly vesti- 



ture mottled, white and dark gray; elytral setae very sparse 



and excessively minute. 12-15 mm. Western Arizona and 



Colorado Desert of California argentatlis Lee. 



I2. Prothorax finely punctate, widest at about the middle ; scaly 

 vestiture whitish, not or scarely mottled ; elytral setae mod- 

 erately numerous. 17-22 mm. Colorado Desert, California. 



tlesertus Horn. 

 F*. Elytral striae fine, finely punctate, the intervals flat or nearly so. 

 J1. Prothorax very finely punctate, scaly vestiture white, pro- 

 thorax with rather wide dorso-lateral blackish vittae, elytra 

 feebly irrorate with blackish gray ; tibiae denticulate within. 

 12-18 mm. Death Valley, Southern California. 



mortivallis n. sp. 

 J2. Prothorax rather coarsely and deeply punctate. 



Ki. Median sulcus of beak narrow and sharply impressed ; pro- 

 thorax trivittate with dark gray, elytra conspicuously vittate; 

 tibiae finely denticulate. 7^-12| mm. Southern California. 



gem mill at us Horn. 

 K2. Median sulcus of beak broader and more vague ; neither pro- 

 thorax nor elytra distinctly vittate ; tibiae not appreciably 

 denticulate. 

 Li. Vertex evenly convex, scales whitish to cinereous, marmo- 

 rate with darker gray; size smaller. 7-111 mm. Arizona, 



California, Nevada varius Lee. 



L2. Vertex flattened, finely carinate, scales pinkish-cinereous, 

 feebly mottled with gray; size larger. 14 mm. Western 

 border of Colorado Desert, California aridus n. sp. 



