BEETLE GENUS ONTHOPHAGUS — HOWDEN, CARTWRIGHT 27 



brighter, shining green, with black clypeus; pronotal protuberance 

 in both sexes not as wide. 



Onthophagus brevifrons Horn 



Plate 2, Figures 12 and 13 



Onthophagus brevifrons Horn, 1881, p. 76.— Henshaw, 1885, p. 87.— Shaeflfer, 

 1914, p. 300.— Leng, 1920, p. 49.— Boucomont and GiUet, 1927, p. 204.— 

 Bouoomont, 1932, p. 315.— Howden, Cartwright, and Ilalffter, 1956, p. 6. 



Male majors.— Length 8.6 to 10.3 mm., wddth 5.3 to 5.7 mm. 

 Color miiformly brown, piceous, or black; head and pronotum shin- 

 ing, occasionally with violaceous luster, elytral intervals dull, finely 

 alutaceous. Head with clypeus reflexed, more so anteriorly than 

 laterally, anterior edge vaguely emarginate (Horn's Kansas specimens) 

 or truncate, rounded in worn specimens ; lateral margin delimited from 

 gena by faint notch, gena scarcely flared, broadly arcuate; disc of 

 clypeus and genae with scattered large shallow punctures, clypeus 

 often rugosely punctate laterally, base of clypeus and anterior portion 

 of frons tumid, the clypeal carina barely indicated by an impunctate 

 hne across the tumosity. Frons coarsely punctate, the punctures half 

 the size of the larger clypeal punctures. Surface of clypeus, genae, 

 and frons between the punctures smooth and shining. Carina of 

 vertex low, bowed anteriorly on each side of a raised median point, and 

 ending laterally near the posterior margin of the eyes; scattered coarse 

 punctures behind the carina, smooth areas between the punctures very 

 finely alutaceous. 



Pronotum margined anteriorly and laterally, lateral margins no- 

 ticeably bent downward in anterior third; pronotum convex, with a 

 large, rounded, anterior tumosity rising abruptly behind the anterior 

 margins and ending on each side in a small raised ridge. Below the 

 ridge on each side of the tumosity a shallowly concave area extending 

 to the bend in the lateral pronotal margins and forward to the anterior 

 angles; surface of the concavity fmely alutaceous near the anterior 

 angles, otherwise the surface smooth and shining between the pronotal 

 punctures. Punctm-es of two sizes, large, deep, sharply delimited 

 circular punctures separated by 1 to 2 diameters, and, between these, 

 scattered small well-defined punctures less than one-fourth the 

 diameter of the larger ones; both t3T)es of punctm-es most numerous on 

 the face and along the top of the tumosity, becoming more widely 

 separated posteriorly and near the anterior angles; large punctures on 

 the face of the tumosity often bearing setae. 



Elytral striae coarsely punctate, shallowly impressed; intervals with 

 numerous small shining tubercles with fine setae at their bases, the 

 surface between the tubercles finely alutaceous, tubercles on the third, 



