172 PROCEEDINGS OF THE NATIONAL MUSEUM vol. lo* 



Genital capsule of male somewhat elongate, lateral lobes approxi- 

 mately twice as long as wide, apical angle less prolonged than in B. 

 farctum, tipped with a few long setae (figured by Brown). 



Variation in elytral maculation is moderate; the oblong spot is 

 fairly uniform, but the elytral margins may or may not be marked 

 with black. B. confusum may be distinguished from other species 

 having elytral spots by the absence of a median forward dentiform 

 projection of the posterior pronotal black area and by the lack of any 

 setae in the elytral punctures, except for a few seta-bearing punctures 

 at the margin and on the epipleuron. 



Biologically, little is known about this species. Brown (1928, p. 

 192) mentions collecting B. confusum in a mixed aggregation with 

 B. biplagiatum. Occasional specimens have been collected at light, 

 indicating at least some nocturnal activity. From the label data on 

 specimens examined, the adults appear to be active during March, 

 April, May, August, September, October, and November, with the 

 fall months being the period of greatest activity. 



Specimens examined: 27 males, 22 females. 



ARKANSAS: 10 males, 6 females. Fayetteville, Hope, Imboden, Washington 



County: (2) August, (1) September, (4) October, (2) November. 

 ILLINOIS: 2 males, 1 female. Olney. 

 IOWA: 1 male. Ames. Paratype, from literature. 

 LOUISIANA: 2 males, 2 females. Camp Claiborne, Lafayette, Opelousas; (l) 



October. 

 MISSOURI: 2 males, 2 females. Columbia, Scott County, Springfield; (1) 



May, (3) November. 

 OKLAHOMA: 4 males, 4 females. Payne County, Stillwater; (1) May, (1) 



September, (4) October. 

 TEXAS: 6 males, 7 females. Brazos County, College Station, Dallas County, 



Rockwall; (2) March, (1) April, (1) May, (1) September, (2) November. 



Bolbocerosoma tumefactum (Palisot de Beauvois) 



Scarabaeus iumefadus Palisot de Beauvois, 1805, p. 91, pi. 2, fig. 6. 

 Bolboceras tumefactus (Palisot de Beauvois) Klug, 1845, p. 50. 

 Bolbocerosoma tumefactum (Palisot de Beauvois) Schaeffer, 1906, p. 254. — Dawson 

 and McCoUoch, 1924, p. 13.— Brown, 1928, p. 193.— Ritcher, 1947, pp. 11-12. 



Length 8 to 11 moi., greatest width 5.5 to 8 mm. 



Dorsum orange-brown to red-brown, marked with black as follows 

 in male: Eye, eye canthus, vertex, tubercles, horn, usually most of 

 clypeus, tips of carinae of pronotal modification, basal portion of 

 lateral limiting grooves, apical pronotal margin between lateral 

 carinae, median spot behind pronotal modification, narrow band 

 widest medially, extending laterally no farther than elytral margin, 

 scutellum, extreme base of elytra, elytral margin, sutural intervals, 

 and postmedian spot normally confluent only with elytral margin. 

 Postmedian spot in a few instances touching black sutural interval in 



