NORTH AMERICAN GEOTRUPINAE — HOWDEN 183 



carina is slightly developed, evenly arcuate. Lateral limiting grooves 

 and lateral carinae barely indicated. 



Genital capsule of male blunt (pi. 3, fig. 6), lateral lobe about 1.3 

 times as long as wide, tipped with a dozen or so long setae. 



A moderate amount of variation is present in the extent of the 

 subapical black spot, but it is always confluent with sutural interval, 

 and this coupled with the long erect yellow setae will distiuguish the 

 species. The number of setae on the pronotum and elytra vary con- 

 siderably and sometimes are overlooked on hasty examination. 



Nothing has been published on the biology of pusillum. Specimens 

 examined were collected from April through November, except 

 during August, indicating a long period of adult activity. 



Specimens examined: 25 males, 25 females. 



COLORADO: Paratype (from literature), 1 female. No data. 



ILLINOIS: 1 male. Chicago (?). 



KANSAS: 6 males, 3 females. Manhattan, Onaga, Riley County, Wallace; 

 (2) June, (1) July. 



OKLAHOMA: 1 male. Wichita National Forest. 



TEXAS: 17 males, 22 females. Abilene, Amarillo, Brownsville, Comfort, Coryell 

 County, Dallas County, Fedor, Liberty Hill, New Braunfels, Val Verde County, 

 Wichita Falls; (2) April, (5) May, (3) June, (1) July, (1) September, (1) November. 



Bolbocerosoma pusilliim totvnesi, new subspecies 



Holotype: Male, length 10.5 mm., greatest width 7.2 mm. 



Dorsum reddish brown marked with black as follows: Vertex, most 

 of clypeus, eyes, eye canthi, apical pronotal margin between lateral 

 carinae, lateral limitmg grooves and inner portions of adjacent tuber- 

 cles of transverse and lateral carinae, band on pronotal base very 

 narrow at midline, broader laterally and extending no farther than 

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

 and entire apical two-fifths of elytra extending from sutural interval 

 almost to margin. The black area barely reaches margin of elytra 

 and then only in apical fourth. Ventral surface brownish black. 

 Tibiae brownish black. Vertex coarsely, moderately punctured, 

 punctures of clypeus generally regular and dense. Pronotum coarsely, 

 irregularly punctate, slightly less so than in majority of specimens 

 of B. pusillum examined, lateral portions more finely, closely punc- 

 tured, more so anteriorly. Minute secondary punctures evenly dis- 

 tributed over pronotum. Declivity of pronotal modification coarsely 

 punctured only in lower two-thirds. Scutellum with shallow groove 

 running its length, with moderate number of secondary punctures. 

 Second elytral stria enthely lacking. Fifth and eighth striae indicated 

 only by a line of very small punctures. Punctures in striae not sharply 

 delimited, generally separated by slightly less than their own diameter, 



327015—55 3 



