180 PROCEEDINGS OF THE NATIONAL MUSEUM vol. lo* 



of usual type, not strongly developed, the limiting concavities and 

 tubercles obsolete. 



Genital capsule of male (figured by Brown) blunt, lateral lobe 1.5 

 times as long as wide, tipped with a number of very long setae, a few 

 being almost as long as the capsule. 



Variation of color was quite pronounced in the few specimens 

 examined, one specimen with light yellowish tan markings, and another 

 with the markings almost black. Generally all of the specimens have 

 a faded appearance. 



The complete lack of second elytral stria, the sparse punctures, the 

 male genitalia, and usually the color will distinguish this species. 



Brown (1928, p. 192) mentions finding lepidissimum with bruneri 

 and biplagiatum, presumably with the same nocturnal and burrowing 

 habits as the other species. Nocturnal activity is also indicated by 

 one of the few specimens examined bearing the label "at light." 

 Specimens, to date, have only been collected in June and July but 

 probably have a longer period of adult activity. 



Specimens examined: 3 males, 1 female. 



ARKANSAS: 1 male, Washington County, July 18, 1928 (INHS). 



ILLINOIS: 1 male, Anna, June 27, 1909, at light (Howden). 



LOUISIANA: 1 male, Vernon Park (AMNH). 



OKLAHOMA: (Type and allotype, from literature, Payne County, October, 



Brown (CC).) 

 TEXAS: 1 female, Marathon (Brewster County) (Robinson). 



Bolbocerosoma biplagiatum Dawson and McColloch 



Bolbocerosoma biplagiatum Dawson and McColloch, 1924, p. 12 (type, male, 

 Nebraska (UnNeb)).— Dawson, 1922, p. 194.— Brown, 1928, p. 193. 



Length 8.5 to 13.5 mm., greatest width 6.5 to 9 mm. 



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

 in male: Vertex, most of clypeus, eyes, eye canthi, apical pronotal 

 margin between lateral carinae, lateral limiting grooves, lateral por- 

 tions of transverse carina, lateral portions of pronotal declivity, band 

 on pronotal base extending sharply forward at midline (dentiform 

 point), and extending laterally no farther than elytral margin, scutel- 

 lum, extreme base of elytra, sutm-al intervals, and a small almost 

 circular postmedian spot. This spot is usually scarcely longer than 

 wide and is separated from both the sutural interval and elytral mar- 

 gin by about its own width. Female marked as male except the 

 black of the lateral limiting grooves may be lacking. In both sexes 

 the ventral portions of thorax and abdomen dull yellowish brown, 

 some of thoracic sternites may be black; femora dark brown to black. 

 Vertex coarsely, sparsely punctate, less so in females; punctures of 

 clypeus slightly irregular, dense, generally not confluent. Pronotum 



