112 PROCEEDINGS OF THE NATIONAL MUSEUM vol. ii4 



evinced any interest in the dung, dying without attempting to con- 

 struct brood cells. 



As indicated in the synonymy, this species was known for many 

 years under the name 0. subaeneus, as applied incorrectly by Dr. G. H. 

 Horn, a misidentification mentioned in the remarks concerning that 

 species (p. 76). Melsheimer's name 0. protensus was resurrected in 

 1932 by Boucomont who apparently overlooked the earlier name by 

 Laporte. Gemminger and Harold (1869) correctly placed protensus as 

 a synonym of concinnus. Casey seems to be the only American 

 specialist who correctly identified his specimens as 0. concinnus. 



Onthophagus medorensis Brown 



Plate 8, Figures 77 and 78 



Onthophagus medorensis Brown, 1929, p. 204. — Boucomont, 1932, p. 309. — Leng 



and Mutchler, 1933, p. 38.— Howden, 1955, p. 65. 

 Onthophagus guatemalensis Schaeflfer, 1914, p. 295 (not Bates, 1887, p. 73). — Leng, 



1920, p. 249.— Leng and Mutchler, 1933, p. 38. 



Male majors. — Length 6.8 to 8 mm., width 3.9 mm. Purplish 

 black to rather shiny purplish blue to moderately shiny green, the 

 color more pronounced on the head and pronotum. Clypeus anteri- 

 orly sharply reflexed, the margin forming a flattened median perpen- 

 dicular horn; laterally the clypeus sharply rounded, presenting an 

 almost rectangular appearance when viewed from above ; disc smooth 

 and shiny with only a few scattered punctures, laterally becoming 

 rugosely punctate; clypeal carina fine but distinct, the fine ridge run- 

 ing completely across from edge to edge ; frons slightly convex behind 

 the clypeal carina, the surface finely tuberculate, with a long yellowish 

 seta at the anterior edge of each tubercle. Frontal carina indicated 

 only laterally by a sharp semi-erect, posteriorly directed horn over- 

 hanging each eye; medially smooth, nontuberculate, often finely 

 alutaceous between the horns. Genae moderately prominent, their 

 lateral margins extending slightly beyond those of the clypeus. 



Pronotmn moderately convex, margined anteriorly and laterally; 

 anterior angles shining, smooth, almost impunctate, minutely aluta- 

 ceous, deeply concave, the fossa extending upward to base of pronotal 

 protuberance. Pronotal protuberance similar to that of 0. concinnus 

 and male minors of 0. hecafe; the process broad, usually slightly wider 

 than the distance between the eyes, and extending to a position approx- 

 imately over the eyes, its anterior end slightly flared, acutely angled 

 and strongly emarginate between the hornlike angulations, without a 

 median downward protrusion as in hecate; when viewed laterally the 

 protuberance flaring upwards slightly at its anterior tips; pronotal 

 disc evenly tuberculate, the tubercles separated by a distance of ap- 

 proximately twice their diameter, the pronotum with a noticeably 



