NORTH AMERICAN GEOTRUPINAE — ^HOWDEN 185 



brown. The punctures of the head and thorax are more pronounced 

 in the females than m the males. The obsolete second striae on some 

 of the specimens are represented by two or three very small punctures. 

 Teeth on outer margin of foretibia are either seven or eight in number. 

 Other differences are slight. 



This subspecies has almost the identical markings of pusillum but 

 can be separated from it by the lack of the long erect yellow hairs on 

 the dorsal surfaces of pronotum and elytra. It may be separated 

 from other species by the blunt genital capsule of the male and by the 

 distal black area which is confluent with the sutural stripe, but which 

 laterally and anteriorly does not extend to the elytral margin. 



No biological information other than that contained on the labels 

 is available for this subspecies. 



Bolbocerosoma quadricornum Robinson 



Bolbocerosoma quadricornum Robinson 1941, p. 132. Type, male. New Braunfels, 

 Comal County, Tex., August, Schaeflfer (Robinson). 



Length 8.8 to 9 mm., greatest width 6.2 to 6.4 mm. 



Dorsum reddish brown marked with black as follows in holotype 

 (male) : Vertex, tip of horn, and tubercles, apical pronotal margin 

 between lateral carinae, lateral limiting grooves, and inner portions 

 and tips of adjacent tubercles of transverse and lateral carinae, band 

 on pronotal base very narrow at midline and extending no farther 

 than elytral margin, edges of scutellum, sutural intervals, and a 

 post median spot with its forward edge beginning halfway between 

 the base and apex of the elytron and from the fourth stria almost to 

 the margin. Foretibia edged with black. Ventral surface dark 

 orange to almost black. Vertex coarsely, heavily punctured with the 

 punctures of the clypeus regular and dense. Pronotum coarsely, 

 heavily, irregularly punctate, punctures becoming smaller and very 

 dense laterally. Minute secondary punctures scattered evenly over 

 entire pronotum. The declivity of pronotal modification coarsely 

 punctured only on lower (apical) half. Scutellum with a few irregu- 

 larly placed coarse punctures and numerous fine secondary punctures. 

 Second elytral stria obsolete, represented by only two or three shallow 

 punctures. Fifth and eighth striae indicated by only a few small 

 punctures. Punctures in elytral striae moderately pronounced, 

 usually separated by slightly more than their own diameter. A 

 few of the elytral punctures and other punctures of the elytra and 

 pronotum bearing long erect yellow hairs which are very sparse. 

 Long setae also present on epipleura and elytral margin. Foretibia 

 armed with eight teeth on outer margin. Mesosternal prongs only 

 slightly developed in front of middle coxae, not elevated above plane 

 of metasternum. Hair of underside long and sparse. 



