NORTH AMERICAN GEOTRUPENAE — ^HOWDEN 175 



Bolbocerosoma bruneri Dawson and McColloch 



Bolbocersoma bruneri Dawson and McColloch, 1924, p. 14 (type, male, Nebraska 



(UnNeb)).— Dawson, 1922, p. 194.— Brown, 1928, pp. 192-193. 

 Bolbocerosoma fardum Blatchley (not Fabricius), 1910, p. 937. 



Length 8.5 to 14.5 mm., greatest width 6.5 to 9.5 mm. 



Dorsum yellow to reddish brown, marked with black as follows in 

 male: Eyes, vertex of canthus, tubercles, horn, part of clypeus, tips 

 of tubercles of pronotal modification, lateral limiting grooves, apical 

 pronotal margin between lateral carinae, band on pronotal base 

 extending laterally no farther than elytral margin, scutellum, extreme 

 base of elytra, sutural stripe, margin of elytra below humeri extending 

 in a few cases to apex and large posterior spot confluent with sutural 

 stripe. Posterior spot usually not confluent with elytral margin except 

 at apex. Female marked as male except the only black on pronotal 

 modification is trace along transverse carina. In both sexes ventral 

 surface reddish brown, slightly darker on abdomen. Tibia edged with 

 dark brown. Vertex and clypeus coarsely and densely punctured. 

 Pronotum coarsely, irregularly punctate medially, more so than in 

 either farctum or tumefactum. Lateral portion of pronotum more 

 finely, closely punctate, more so anteriorly. Minute secondary 

 punctures evenly, rather densely distributed over pronotum. De- 

 clivity of pronotal modification coarsely punctm-ed only in lower half. 

 Scutellum with numerous secondary punctures. All elytral striae well 

 developed, except basal portion of eighth. Punctures in elytral 

 striae separated by about one-half their diameter, without setae. 

 Epipleuron and elytral margin each bear a row of long setae. Fore- 

 tibia usually armed with eight teeth on outer margin, sometimes with 

 seven or nine. Mesosternal prominence in front of middle coxae well 

 developed, concave on anterior face and elevated above metasternal 

 plane. Hair of underside long, not dense. 



Head of male with pronounced tubercles and horn, not bifid at tip. 

 In male, pronotal modification weU developed. Pronounced trans- 

 verse carina widely emarginate, more so than in tumefactum. Lateral 

 limiting grooves deep, lateral carinae moderate. In female, transverse 

 carinae small, evenly arcuate. Lateral limiting grooves and lateral 

 carina obsolete. 



Genital capsule of male (figured by Brown) moderately elongate, 

 not lobate basaUy, tip of lateral lobe rounded, not prolonged as in B. 

 farctum. Similar to B. tumefactum. 



Variation of pattern is quite pronounced, clypeus either entirely 

 black or brown. One-third to one-half of the posterior portion of 

 elytra is black, and elytral margin may be entirely black or brown. 



