NORTH AMERICAN GEOTRUPINAE — HOWDEN 179 



Bolbocerosoma lepidissitnunt Brown 



Bolbocerosoma lepidissimum Brown, 1928, p. 193. Type, male, Oklahoma (CC), 



Length 8.5 to 11 mm., greatest width 6 to 7.5 mm. 



Dorsum pale brownish yellow to light reddish brown, marked with 

 brown to black as follows in male : Eye, vertex, tip of horn, tips of 

 clypeus and eye can thus, lateral portions of transverse pronotal carina, 

 lower half to tv/o-thirds of lateral limiting groove, narrow line on apical 

 pronotal margin, between lateral cariuae, band on pronotal base 

 extending laterally no farther than elytral margin, scutellum, sutural 

 intervals, extreme base of elytron except humerus, elytral margins and 

 posterior half to two-thirds of elytron from sutural interval to elytral 

 margin but not including the subapical umbone. Small spot at apex 

 of elytron usually not blackish. Punctures in elytral striae often 

 noticeably blackish in color. Female similarly marked. In both 

 sexes ventral portion of head and thorax yellow to reddish yellow, 

 abdomen brovvaiish yellow to brown. Outer m.argin of at least fore tibia 

 edged with black. Vertex of male finely, sparsely punctured; 

 punctures of clypeus rather coarse and close, but not well defined. 

 Coarse medial punctures of pronotum very sparse, becoming slightly 

 smaller and more dense laterally; posterior black area impunctate. 

 Minute, indistinct secondary punctures evenly distributed over 

 pronotum. Declivity of pronotal modification sparsely, coarsely 

 punctured only in lower third or half. Scutellum with minute 

 secondary punctures. Punctures of female (from Brown) : Head 

 densely, rather coarsely punctate; a space on the vertex smoother; 

 pronotum at middle very sparsely, irregularly punctate; the punctation 

 of the sides finer and dense; the declivity with moderately close, coarse 

 punctures on apical half, the basal half very finely punctate. Second 

 elytral striae entirely lacking, fifth and eighth striae not impressed, 

 represented by only a few smaU punctures. Pronounced punctures in 

 elytral striae separated by slightly more than their diameter, without 

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

 Foretibia armed wdth eight teeth on outer margin. Mesosternal 

 prominence in front of middle coxae acute, elevated slightly above 

 metasternum. Hair of underside fairly long and moderately dense. 



In male, the tubercles of clypeus and eye canthi similar to those of 

 B. Jarctum, slightly thinner dorsoventrally. Horn in center of vertex 

 pronounced, noticeably smaller in width than B. farctum, usually 

 slightly bifid at tip (when not worn). Female lacking horn and 

 tubercles, but with carina similar to female of B. farctum. Pronotal 

 modification of male with transverse carina feebly emarginate. 

 Lateral limiting grooves very shallow, lateral carina only vaguely 

 indicated. Brown states that the pronotal modification of female is 



