16 PROCEEDINGS OF THE NATIONAL MUSEUM vol. lu 



of the frontal carina. In the male the carina is slightly arcuate for- 

 ward and evenly elevated, with roimded ends. In the female the 

 frontal carina is sharply angulate anteriorly at the middle, and the 

 ends are also sharply angulate and prominent. The front tibia is 

 slightly wider in the female. 



Females. — Length 11 to 11.3 mm., width 6.5 to 7.2 ram. Differing 

 from male majors in the following respects: Clypeus almost evenly 

 arcuate, anteriorly broadly slightly emarginate and only slightly 

 reflexed; laterally not extending beyond the genao; disc flat and not 

 concave as in male major, surface moderately rugosely punctate; a 

 low clypeal carina separating the clypeus from the frons and extending 

 laterally to the juncture with the genae. Frons moderately coarsely, 

 almost rugosely punctate as are the genae; carina of the vertex 

 strongly developed and strongly angularly bowed forward medially, 

 ending on each side in a long horn as described for the male major. 



Pronotum %vith outline, punctation, convexity, and tumosity similar 

 to the male major. The elytra are similar also. The pygidium is 

 slightly convex apically, shining, and with scattered close setigerous 

 punctures. Ventrally the major differences from male majors are the 

 more pronounced thoracic punctures, the even length of the last 

 abdominal segment, and the shorter, thicker foretibia. The four 

 teeth on the foretibial margin are broader than in the male, but the 

 margin is still smooth and nonserrated. Females show more varia- 

 tion than is usually found in this sex, the horns at the ends of the 

 frontal carina in fully developed individuals being longer than in most 

 males and the high connecting carina being angularly bent far forward 

 with a short but noticeable longitudinal carina extending back from 

 the angle. 



Type. — Lectotype, present designation, a large female in Academy 

 of Natural Sciences of Philadelphia, Type 3569. Horn stated that 

 the three specimens before him were males, ])ut examination shows 

 all are females. 



Type locality. — Santa Fe Canyon, New Mexico (700 ft.). 



Specimens examined. — 43. 



Distribution. — (See fig. 1, p 17.) 



New Mexico: Santa Fe Canyon, Water Canyon (5000 ft.), Cloudcroft, Fort 

 Wingate, Las Vegas, El Porvenir (San Miguel Co.), Torrance, 6 mi. south of 

 Thoreau (McKinley Co.) from stomach of Amhystnma tigrinum. Arizona: Chi- 

 ricahua Mts., Douglas, Prescott, 8 mi. south of Showlow, Springerville (Apache 

 Co.), General Springs (Coconino Co.), Woolaroc. Colorado: Colorado Springs. 

 NEBRASKA: Halsey. 



Kemarks. — Oniho2)hagus coproides, the largest North American 

 Onthophagus, can be distinguished by the nonserrated margin between 



