BEETLE GENUS ONTHOPHAGUS — HOWDEN, CARTWRIGHT 107 



reflexed anteriorly, shallowly emarginate, with disc rugosely punctate; 

 clypeal carina weak but distinct; frons coarsely punctate; carina of 

 vertex pronounced and fairly uniform in height, nearly straight when 

 viewed from above, not noticeably bent posteriorly at the midline. 

 Pronotum similar to that of male minor except that the pronotal 

 tumosity is less evident, lower, broad, and slightly arcuate. Elytra 

 similar to those of male major. Pygidium differing only in being less 

 convex apically. Ventrally the color of the females ranges from red- 

 dish brown to black, with setae shorter than in the male major; punc- 

 tures of the thorax and abdomen slightly less pronounced, and the 

 last abdominal segment not emarginate or lighter in color; the fore- 

 tibiae slightly thicker but not shorter than in male majors, and their 

 flattened outer surfaces, while still punctate, only barely alutaceous. 



Type. — Lectotype, male, present designation, in the Henry Ulke 

 collection, Carnegie Museum, Pittsburgh, Pa. Dr. Horn in his orig- 

 inal description stated that 0. velutinus occurs in Baja California and 

 Arizona. Neither of these locatalities is represented among velutinus 

 specimens in the Horn collection at the Philadelphia Academy of 

 Natural Sciences or in the LeConte collection at Harvard College. 

 Banks, Schwarz, and Viereck (1910) stated that some types of Le- 

 Conte, Horn, and Dietz are in the Henry Ulke collection. In the 

 Ulke collection are two male specimens of the velutinus series bearing 

 only the labels "Ariz." and "Cal." These are presumably from the 

 type series; the Arizona specimen is here designated lectotype. Be- 

 cause the fauna of Baja California is different and distinct from that 

 of Arizona, it seems odd that velutinus would occur there. Examina- 

 tion shows the "Cal." specimen to be an undescribed species having 

 similar cephalic horns and surface sculpture. It will be described in 

 a subsequent paper. 



Type locality. — "Arizona." 



Specimens examined. — 89. 



Distribution. — (See fig. 9, p. 87.) 



Texas: Big Bend National Pk., Del Rio, Dimmit Co., El Paso, Lake Walk, 

 Sabinal, "S.W. Tex." Colorado: Canon City. Arizona: Base of Pinal Mts., 

 Tucson, Sabino Canyon (Pima Co.), Baboquivari Mts., Florence (Pinal Co.), 

 Globe, San Bernardino Ranch (Cochise Co.), Nogales, Ramsey Canyon (Hua- 

 chuca Mts.), 36 mi. east of Gila Bend, 10 mi. east of Nogales, 2 mi. east of Lochiel, 

 Carr Canyon. 



Remarks. — Except for three related species, two of which are de- 

 scribed in tliis revision, 0. velutinus is quite distinct from the other 

 North American Onthophagus. The dull black alutaceous dorsal sur- 

 face and the smaU scattered tubercles on the pronotum and elytra 

 usually distinguish this southwestern species. The long, erect, slightly 

 diverging, straight horns placed rather close together on the vertex are 



