70 PROCEEDINGS OF THE NATIONAL MUSEUM vol.89 



raised smooth area of pygidium occupying apical third, 



or if in apical sixth only, then strongly V-shaped 15 



15 (14). Apical sixth of pygidium raised, polished, and strongly 



V-shaped (fig. 8, n) huachuca, new species 



Apical third of pygidium raised, polished and only very 

 slightl.v V-shaped, at times somewhat irregular in out- 

 line (fig. 8, o) chapini, new species 



16 (10). Base of cl.ypeus transversely raised, usualh^ verj^ coarsely 



punctate; larger intercalated tooth subapical in position 



(Lower California) 17 



Clypeus never gibbose, always plane, puncturation variable 



(United States) 20 



17 (16). Pygidium in lateral view with basal half slightly convex 



and highly pruinose, ajiical half highly polished, evenly 

 and strongly convex, and center disk with a small shallow 

 fovea; front flat, not rugose, rather sparsely punctate; 

 thorax densely, not rugosely, punctate; elytral hair very 

 short and scarcely obvious; dorsal genital plate deeply 

 concave before apex and center base prolonged into a 



blunt, semierect lobe (figs. 13, e-f) miraflora, new species 



Pygidium variable, but not as above; front coarsely punc- 

 tate and usuallj' coarsely rugose; thorax rugoselj' punc- 

 tate or not; elytral hair longer and more obvious than in 

 miraflora; dorsal genital plate smooth or at most trans- 

 versely impressed before apex and usually incompletely 

 so 18 



18 (17). Pygidium convex at base, apical half strongly flattened to 



faintly concave and smooth; dorsal genital plate in 

 lateral view suddenly declivous just before apex (fig. 

 13, a-b) ; thoracic disk densely punctate but never ru- 

 gose, highly polished michelbacheri, new species 



Pj'gidium variable, not as above; dorsal genital plate in 

 lateral view without subapical declivity or latter, if 

 present, always very indefinitely indicated; thoracic 

 disk rugose or not 19 



19 (IS). Thorax densely punctate, never rugose; dorsal genital 



plate in lateral view always smooth (figs. 13, g-h); 

 pygidium variable, center of disk always gibbose and 

 frequently gibbosity slightly to moderately flattened at 

 middle, at times with a trace of a longitudinal sulcus. 



carminator (Horn) 

 Thorax always coarsely rugose; dorsal genital plate usually 

 with a fine, incomplete, subapical impression, rarely en- 

 tire plate smooth (figs. 13, c-d); pygidium highly variable, 

 varying from faintly convex, with center disk flattened, 

 to center disk faintly concave to moderatel.v foveate, or 

 even longitudinally sulcate at middle; disk never so con- 

 vex at middle, however, as in carminator densicollis (LeConte) 



20 (16). P\-gidium highly polished, verj'^ finely punctate, glabrous; 



apex explanately prolonged into two rounded toothlike 



lobes, separated by a narrow U-shaped notch micros (Bates) 



Pvgidium not exactlv as above 21 



