42 PROCEEDINGS OF THE NATIONAL MUSEUM vol. m 



Onthophagus concinnus Horn, 1875, p. 139 (not Laporte, 1840, p. 87). — Leng, 



1920, p. 249. 

 Onthophagus protensus Horn, 1875, p. 139 (not Melsheimer, 1845, p. 134), — 



Austin, 1880, p. 25.— Leng, 1920, p. 249.— Boucomont and Gillet, 1927, p. 206. 

 Onthophagus orpheiis Horn, 1875, p. 139 (not Panzer, 1794, p. 5). — Austin, 1880, 



p. 25.— Henshaw, 1885, p. 87.— Blatchley, 1910, p. 919. 



Male majors. — Length 5.2 to 6.8 mm., width 3.2 to 4.1 mm. Color 

 extremely variable, some uniform brown, piceous, or black with irides- 

 cent cupreous reflections; some with head and pronotum brown, pic- 

 eous, or black with iridescent reflections and with elytra brown, 

 piceous, or black except near the apex and base where they are lighter 

 in color, yellow or brown, and form either isolated spots or a basal or 

 apical band. Head with clypeus prolonged, anteriorly reflexed, usu- 

 ally rounded, occasionally broadly emarginate, laterally normally 

 slightly arcuate and extending obliquely to the gena from which it is 

 separated by a faint notch. Clypeus flared laterally in occasional 

 specimens, each side being strongly arcuate and separated from the 

 gena by a distmct notch. Disc of clypeus flat or slightly concave, 

 smooth, and shiny, with a few widely scattered fine or moderate punc- 

 tures; laterally sometimes coarsely punctate, the punctures occasion- 

 ally bearing fine short setae. Clypeal carina absent. Frons and base 

 of clypeus flat or shghtly convex, smooth, shiny, and hghtly to mod- 

 erately punctate; genae delimited from clypeus and frons by a faint 

 fine. Surface concave in front of eyes; surface of vertex lacking a 

 carma, but with a long arcuate horn inside and behind each eye, 

 the horns often reaching a height equal to the top of the pronotal 

 convexity. 



Pronotum narrowly margined anteriorly and laterally; anterior 

 angles abruptly, often arcuately rounded and dhected outward; lat- 

 eral margins either arcuate or sinuous, but not sharply bent in anterior 

 half. Pronotum convex, with a large anterior median hump or tumos- 

 ity which may have an inverted U or V shape or be nearly truncate 

 anteriorly, normaUy with a concave groove on each side in which the 

 horns of the head may repose. Except for the anterior concavities 

 which may be smooth, shiny, and nearly impunctate, surface of pro- 

 notum coarsely punctate, each puncture bearing a short white seta; 

 punctures separated by approximately 1 diameter, the shape of the 

 punctm-es exhibiting considerable variation, some being shallow and 

 circular, others being deep and ch-cular, often, whether shaflow or 

 deep, with a small tubercle indenting the anterior margin; anteriorly 

 on the pronotal tumosity, tubercles often more evident than the punc- 

 tures, but elsewhere punctures are 2 to 3 times the width of the 

 tubercles. 



Elytra with pmictate striae, which may or may not be noticeably 

 impressed; intervals shallowly convex or flat with two to three irreg- 



