Horn.] 42-j [Sep. 19", 



3. Median vitta more or less dilated at middle. 



Median vitta broadly dilated at middle. 

 Surface glabrous. 



Hind tibiae % simple zeae. 



Hind tibia; % subangulate with dense brusb of 



long liairs scoparius. 



Surface densely clothed with an argillaceous coat- 

 ing. 

 Third elytral interval sub-cariniforin at basal 



half. callosus. 



. Elytral intervals tlat sculptilis. 



Median vitta reduced to a slender apical carina, 

 slightly dilated at the middle of thorax. Surface 



with argillaceous coating melanocephalus. 



Median vitta fusiform, entire, lateral vitta; short, 

 represented by an oblique basal line on each 

 side of base Sayi. 



4. Lateral thoracic striae reduced to short oblique lines at 



base placidus. 



2. Elytra rather deeply striate, stria; scarcely punctured, 

 intervals coarsely, uniseriately punctured. Thorax 

 coarsely, sub-conrluently punctured, and with fine, 

 smooth, median line ; femora sparsely punctate. . . . gentilis. 

 Elytra moderately finely striate, striae more coarsely 

 punctured than the intervals and usually foveato- 

 punctate. 

 Femora very coarsely foveato-punctate, with argil- 

 laceous coating parvulus. 



Femora sparsely punctate, glabrous. 



Thorax very coarsely punctate, a median fusiform 



impunctured space: Thorax large retusus. 



Thorax n*>t coarsely punctate. 

 Thorax sub-opaque, evenly punctate, elytra feebly 



attenuate behind arizonensis. 



Thorax shining, unevenly punctate, elytra strongly 



narrowed at tip gagatinus. 



B. Rostrum not" arcuate, rather short, very strongly com- 

 pressed. Anterior tibia; at least very strongly toothed, 

 or angulate at middle. 

 Anterior tibia; without sub-apical mucro, median tooth 

 strong. 

 Rostrum beneath with a laminiform carina termina- 

 ting abruptly near the base. Thorax beneath 



coarsely punctate, opaque cultellatus. 



Rostrum beneath not carinate, lower edge obtuse. 



Thorax beneath sparsely punctate, shining compressirostris. 



Anterior tibial strongly angulate at middle, sub-apical 



mucro moderately long Germari. 



