BEETLE GENUS ONTHOPHAGUS — HOWDEN, CARTWRIGHT 79 



Onthophagiis aciculatulus Blatchley 



Plate 9, Figures 83 and 84 



Onthophagvs aciculatulus Blatchley, 1928, p. 128. — Blackwelder and Blackwelder, 



1948, p. 30. 

 Onthophagus alutaceus Blatchley, 1919, p. 31 (not Wiedemann, 1823, p. 14). — Leng 



and Mutchler, 1927, p. 38.— Blackwelder and Blackwelder, 1948, p. 30. 

 Onthophagus aciculatus Leng and Mutchler, 1933, p. 38. — Blackwelder and 



Blackwelder, 1948, p. 30. 



Males. — Length 3.8 to 4.5 mm., width 2.5 to 2.6 mm. Black, 

 moderately shining; legs dark piceous. Clypeus moderately reflexed 

 anteriorly, edge flat laterally; widely shallowly emarginate anteriorly, 

 wealdy dentate or angiilate each side of the emargination, lateral 

 margins only slightly arcuate, nearly straight; genae finely, slightly 

 reflexed, widely rounded, not prominent. Entire surface of head very 

 finely alutaceous; clypeus and genae tuberculate-punctate, the small, 

 fine tubercles grouped in short transverse rows and the accompanying 

 punctures bearing short, inconspicuous setae; clypeal carina absent; 

 frons smoother than clypeus but with scattered shallow punctures 

 separated by 2 to 3 or more diameters, their accompanying tubercles 

 inconspicuous; frontal carina represented by two widely separated, 

 elongated, very noticeable tubercles; punctures of vertex as on frons; 

 eyes quite large and wide, twice as long as wide, about 7 facets wide. 



Pronotum finely, completely margined; anteriorly with a small, 

 median, conical protuberance. Siu-face of pronotum rather coarsely, 

 setigerously tuberculate-punctate over anterior thkd, more noticeably 

 so over declivity, elsewhere with simple shallow setigerous punctures; 

 the punctures evenly distributed, everywhere separated by about 1 

 diameter. Setae fine, slightly longer than distance between punctures, 

 surface between punctures finely alutaceous. Elytral striae fine, 

 strial punctures shallow, not conspicuous; intervals flat, alutaceous, 

 setigerously punctate-tuberculate, the small, fine tubercles arranged in 

 one or two irregular rows; setae fine and not very conspicuous, about 

 as on pronotum. 



Pygidium apically convex, smooth and shining, basally alutaceous; 

 moderately, coarsely punctate, the punctures deeper apically, separated 

 generally by about 1 diameter. Underside more shining; femora and 

 metasternum shining, smooth at middle; metasternum with scattered, 

 moderate punctures; abdominal segments with the usual transverse 

 rows of punctures reduced to minute, inconspicuous, setigerous punc- 

 tures bearing very fine setae. Anterior legs not unusually long or 

 slender but probably more so than those of the females; the anterior 

 tibia ending in a small tooth above the spur. 



Females. — Unknown. 



Type. — In Blatchley collection, Purdue University, Lafayette, Ind. 



