BEETLE GENUS ONTHOPHAGUS — HOWDEN, CARTWRIGHT 81 



over the disc, lacking setae, and usually less than a third the diameter 

 of the larger punctures; surface between the punctures shming, smooth 

 or finely alutaceous. Elytra with shallowly punctate striae; intervals 

 with one or two rows of small tubercles, each with a seta at its base; 

 surface dully shining, finely alutaceous. 



Pygidium convex, coarsely, setigerously punctate, and alutaceous 

 basally. Ventral siu^faces of thorax and abdomen laterally alutaceous, 

 coarsel}^, setigerously punctate except in the median posterior portion 

 of the metasternum where the punctures lack setae and are often 

 small or obsolete. Abdominal segments with a basal row of setigerous 

 punctures which often become obsolete medially; last segment 

 slightly emarginate medially. Legs similar in the two sexes. Fore- 

 legs of males not noticeably lengthened, tibia short, stocky, quadri- 

 dentate, outer margin serrate or denticulate between and above the 

 four teeth; apex lacking any projection or pencil of hairs. Femora 

 of all legs with a few scattered fine and coarse setae on their ventral 

 surfaces. In 0. pennsylvanicus the punctures are usually larger and 

 more numerous. 



Females. — Length 2.7 to 4.1 mm., width 2.0 to 2.7 mm. Differing 

 from the males in the following respects: Head with clypeal disc 

 slightly more heavily punctate, sometimes laterally faintl}^ rugose. 

 Clypeal carina usually slightly developed, evident as a low ridge, 

 highest medially and extending the width of the frons; carina of 

 vertex obsolete, no better developed than in males. In other respects 

 head, pronotum, and elytra similar to males. Pygidium less convex, 

 nearly flat except near apex. Ventral surfaces and legs similar to 

 males except for the last abdominal segment which is not narrowed 

 medially. 



Type, — Canadian National Collection 2459. 



Type locality. — Payne Co., Olda. 



Specimens examined. — 2572. 



Distribution. — • (See fig. 3, p. 24.) 



Alabama: Claiborne. Arkansas: Fouke, Lawrence Co. district of Co- 

 lumbia. FLORIDA: Statewide (25 localities). Georgia: Banbridge, Billys Id. 

 (Okefenokee Swamp), Fort Valley, McRae, Millen, Newton, Spring Creek (De- 

 catur Co.), Swainsboro, Upson Co., Vidana. Kansas: Medora. Louisiana: 

 State label only. Mississippi: Gulfort, Perkinston. north Carolina: Carth- 

 age, Faison, Raleigh, Southern Pines, West End. Oklahoma: Grady Co., 

 Lattimer Co. south Carolina: Statewide (21 localities). Tennessee: Burr- 

 ville. Texas: Amarillo, Aransas National Wildlife Refuge, Bailey Co., Brazos, 

 Bastrop, Calhoun Co., Canadian, Colorado Co., Fedor, Lee Co., Montague Co.. 

 Pleasanton, Victoria. Virginia: Nelson Co. 



Remarks. — Onthophagus oklahomensis is one of the smallest of the 

 North American species. It may be distinguished by its small size, 

 black or piceous color, round clypeus slightly truncate anteriorly, 



633411—62 6 



