BEETLE GENUS ONTHOPHAGUS — HOWDEN, CARTWRIGHT 13 



27(26). Prouoturn shining green, frontal carina of male extending almost to 

 eye; female frontal carina wide, gradually elevated from middle 

 to the rounded ends which drop sharply to surface of head, the ends 

 nearer eye than middle; in bat caves, Arkansas to Texas. 



cavernicollis, new species (p. 32) 



Pronotum with at most a greenish cast; male frontal carina extending 



not more than one-half distance from middle to eye; female frontal 



carina with each side elevated to a sharp tubercle, the tip of each 



tubercle nearer the middle than to the eye; Texas. 



subtropiciis, new species (p. 30) 



28(20) . Head and pronotum dull black, elytra largely brown speckled with black ; 



length 6.7 to 9.5 mm.; male v,ith median horn on vertex behind eyes; 



female usually with small prontal hump behind head; southern 



Canada and northern United States except Central Plains area. 



nuchicornis (Linnaeus) (p. 123) 



Characters not as above 29 



29(28). Pronotum sliining between punctures, not dull brownish black; pygidium 

 usually distinctly punctate with at least apical half sliining ... 30 

 Pronotum dull brownish black, alutaceous between setigerous punctures; 

 pygidium shallowly punctate, usually alutaceous at least to apical 

 third; elytra dull black with scattered small round yellowish spots, 

 particularly along apical margin; eastern United States to Kansas 

 and Oklahoma, rarely Texas and Arizona. 



tiiberculifrons Harold (p. 85) 

 30(29). Punctures of pronotum lacking tubercles at anterior margins; males 



without horns on the head 31 



Punctures of pronotum with small tubercle in front of each seta; base 

 and apex of elytra brownish yellow; head of male with two slender 

 horns extending upward behind the eyes; Vermont to Florida, west to 

 Nebraska and Texas. 



striatulus striatulus (Palisot de Beauvois) (p. 41) 



31(30). Pygidium bicolored, rarely all yellow 32 



Pygidium uniformly dark; pronotum and elytra shining greenish brown 

 to black; elytra with a reddish-yellow spot just inside each humerus 

 and frequently smaller round discal spots scattered elsewhere but 

 always showing on the fifth interval first; Texas. 



schaeflferi, new species (p. 88) 

 32(31). Base of pronotum finely margined only at middle; pronotum black or 

 brownish black, occasionally greenish black; anterior angles of prono- 

 tum and frequently lateral and anterior margins yellow; yellow of 

 elytra often forming stripes; apex of elytra frequently yellow but 

 usually broken by a dark marginal spot at end of fourth interval; 

 fifth interval never with discal spots, rarely with base and apex yellow; 



Texas landolti texanus Schaefler (p. 91) 



Base of pronotum completely margined; pronotum green or coppery, 

 anterior angles not hghter in color; elytra usually with irregular 

 yellow areas at base and apex and with at least a few small round 



spots on disc; Arizona hopfneri Harold (p. 95) 



33(2). Tubercles of pronotum very conspicuous. Clypeus of males triangularly 

 produced upward at middle, clypeus of females evenly rounded; if not, 



elytra bicolored 37 



Tubercles of pronotum moderate with moderate to vague punctures at 

 their bases; clypeus of both sexes broadly rounded or slightly emargi- 

 nate 34 



