BEETLE GENUS ONTHOPHAGUS ^HOWDEN, CARTWRIGHT 95 



There are less noticeable differences in the width and punctures of 

 the elytral striae and in the emargmation and teeth of the cljqjeus. 

 Typical landolti is distributed at least as far north as Sonora, Mexico. 



0. texanus is frequently confused with 0. hopfneri Harold and 

 0. schae-fferi, new species; however, in texanus the yellow-brown 

 color of the elytra tends to form longitudinal stripes and never forms 

 round spots on the disc of the elytra. 



In southern Texas, 0. texanus is not uncommon in low shaded 

 areas. The writers took it in numbers in the lower Rio Grande 

 Valley, particularly in the palm jungle at Southmost below Browns- 

 ville and in the Bentsen-Rio Grande State Park. Most of the speci- 

 mens were taken under fresh horse droppings, but some were found 

 at Lake Corpus Christi State Park on watermelon rind and under 

 cow dung. 



Onthophagiis hopfneri Harold 



Plate 6, Figures 44 and 45 



Oathophagus hopfneri Harold 1869, p. 512. — Boucomont and Gillet, 1927, p. 



206.— Boucomont, 1932, p. 326— Robinson, 1948, p. 176. 

 Onthophagus arizonensis Schaeffer, 1909, p. 382; 1914, p. 296. — Leng, 1920, p. 



249.— Boucomont and Gillet, 1927, p. 204.— Boucomont, 1932, p. 314.— 



Robinson, 1948, p. 176. 

 Onthophagus landolti Robinson, 1948, p. 176 (not Harold, 1880, p. 34). 

 Onthophagus texanus (Schaeflfer), Robinson, 1948, p. 176. 



Male majors. — Length 4.7 to 5.1 mm., width 2.7 to 3.0 mm. Head 

 and pronotum shining green to dark green, often with cupreous or 

 violaceous reflections; elytra usually largely brownish yellow with 

 black arcuate median band mottled with small, round yellowish spots, 

 occasionally mostly black with scattered yellow spots; sutural inter- 

 vals black; legs reddish brown to piceous. Head with clypeus sharply 

 reflexed anterioii}^, scarcely so laterally, reflexed portion broadly 

 shallowly emarginate medially and more or less angulate on each side; 

 disc smooth, nearly flat, with only an occasional coarse puncture and 

 a few fine ones; both clypeal carina and the carina of the vertex ab- 

 sent; surface of frons and vertex similar to that of clypeus, only 

 slightly convex; gena deUmited from clypeus by a fine line, its surface 

 finely alutaceous and coarsely punctate, margins of genae abruptly 

 rounded near eyes. 



Pronotum completely margined, poorly so posteriorly, anterior an- 

 gles acutely rounded, lateral margins arcuate. Disc of pronotum 

 moderately convex with a somewhat flattened conical median projec- 

 tion extending forward over the head, the protuberance abruptly 

 rounded anteriorly and curved slightly upward; disc coarsely punc- 

 tate, the punctures separated by a distance equal to 1 to 2 diameters, 



