BEETLE GENUS ONTHOPHAGUS — HOWDEN, CARTWRIGHT 91 



In hopfneri (usually labeled arizonensis) , the yellow is usually a 

 brighter yellow compared to the reddish yellow or brownish yellow 

 of schaeferi; the yellow is always much more extensive, the base and 

 apices of the elytra usually solid yellow with numerous small, round, 

 yellow spots in between; the 8th elytral interval is solid yellow pos- 

 teriorly. 



Dr. A. Villiers kindly checked a specimen of schaefferi with Har- 

 old's specimens of allied species in the Museum National d'Histoire 

 Naturelle and reported no similar specimens were represented. 



The writers' observations indicate that 0. schaefferi is less abun- 

 dant than /. texanus, though the two are often taken together in 

 shaded habitats in the lower Rio Grande Valley. They are attract- 

 ed to excrement of many different animals. 



The species is named after Charles Schaeffer whose 1914 revision 

 of Onthophagus has served American entomologists for over fifty years 



Onthophagus landolti texanus Schaeflfer 



Plate 6, Figures 46-48 



Onthophagus texanus Schaeffer, 1914, p. 299. — Leng, 1920, p. 249. — Boucomont 



and Gillet, 1927, p. 208.— Robinson, 1948, p. 176. 

 Onthophagus landolti var. texanus (Schaeffer), Boucomont, 1932, p. 314, 326. 



Male majors. — Length 4.6 to 5.3 mm., width 2.8 to 3.1 mm. 

 Head and pronotum shining, piceous to black, rarely with faint 

 greenish cast, usually with anterior angles and anterior lateral margins 

 of pronotum narrowly brown. Elytra variable, frequently black with 

 humeral spots and apical portion yellowish brown, occasionally largely 

 brown, with only sutural interval and parts of intervals behind the 

 humeri black; quite often with alternate black and brown intervals, 

 giving a striped appearance, the sutural and alternate following inter- 

 vals black, always with a marginal black spot beyond 4th and 5th 

 intervals. Pygidium bicolored, centrally piceous or black, marginally 

 brown; ventral surfaces piceous to black with lateral margins of abdo- 

 men and legs brown to dark bro^vn. Head with clypeus extended 

 and abruptly reflexed anteriorly, scarcely reflexed and obtusely 

 arcuate laterally; a bidentate appearance resulting from broadly 

 emarginate and laterally abruptly angulate reflexed portion. Clypeal 

 disc flat and smooth, very finely punctate medially, with a few scat- 

 tered, moderate, setigerous punctures laterally; clypeal carina absent; 

 frons fimely pimctate, smooth, shinmg, and almost flat; genae scarcely 

 flared, sm-face smooth to finely alutaceous with scattered, moderate, 

 setigerous punctures; vertex slightly elevated but with carina obsolete, 

 sm'face smooth to alutaceous and nearly impunctate. 



Pronotum finely margined anteriorly, lateraUy and basally very 

 finely at middle; anterior angles sharply rounded; pronotum wider 



