NORTH AMERICAN GEOTRUPINAE — ^HOWDEN 231 



Missouri, Texas, Oklahoma) opacus Haldeman 



Color shining dark brown, dorsal surface not finely granulate (Virginia, North 

 Carolina, and Alabama) ulkei Blanchard 



3. Anterior tooth of foretibia of males never expanded and produced inwardly; 



females (and males) with longitudinal row of setigerous punctures next to 

 longitudinal carina on flattened dorsal surface of front tibia interrupted 

 by a strong curved carina extending onto the penultimate tooth on outer 



margin (pi. 2, fig. 14) 4 



Anterior tooth of foretibia of males expanded and produced inwardly; females 

 (and usually males) with longitudinal row of setigerous punctures next to 

 the longitudinal carina on flattened dorsal surface of front tibia not inter- 

 rupted by a strong curved carina extending onto the penultimate tooth 

 (pi. 2, figs. 12, 13) ; a weak carina sometimes present in males of egeriei. . 6 



4. Femora without pronounced iridescent bluish or purple color; hind femur 



of male without posterior carina produced into a tubercle near the 



coxa; size generally 15 mm. or smaller 5 



Femora with pronounced iridescent bluish or purple color; hind femur of male 

 with posterior carina produced into a tubercle near the coxa; size generally 

 20 mm. or over (Canadian Maritime Provinces) . . stercorarius (Linn6) 



5. Pronotum and elytra completely black without any trace of iridescent blue or 



purple; males with anterior femur bearing a tooth at base of forward 

 margin, female without tooth (southeastern Canada to Georgia, generally 



east of the Mississippi River) hornii Blanchard 



Pronotum and elytra not completely black, with at least some trace of 

 iridescent blue or purple; males without anterior femur bearing a tooth at 

 base of forward margin, not externally different from female (southeastern 

 Canada to Georgia, generally east of Mississippi River) . . . balyi Jekel 



6. Longitudinal carina on flattened dorsal surface of front tibia not curving 



towards penultimate tooth of outer margin, generally close to inner margin 

 throughout its length (pi. 2, fig. 13); punctures of elytral striae shallow, 

 usually not having a more pronounced iridescent color than surrounding 



surfaces ,7 



Longitudinal carina on flattened dorsal surface of front tibia curving slightly 

 toward or extending to outer margin when opposite penultimate tooth, 

 approximately median in position, particularly apically (pi. 2, fig. 13); 

 punctures of elytral striae deep, usually having a more pronounced iridescent 

 color than surrounding surfaces (southeastern Canada to Florida) . 



egeriei Haldeman 



7. Posterior ventral longitudinal setigerous carina on hind femur not extending 



two-thirds the length of the femur; elytral striae rough, with at least a trace 



of punctures 8 



Posterior ventral longitudinal setigerous carina on hind femur extending more 

 than two-thirds the length of the femur; elytral striae smooth, lacking any 

 trace of punctures (southeastern Canada to North Carolina). 



semiopacus Jekel 



8. Row of longitudinal setigerous punctures which is contiguous basally with the 



longitudinal carina of the foretibia, apically separated from the carina, 

 forming a smooth area usually several millimeters in length between the 

 carina and the punctures (pi. 2, fig. 13) ; color dorsally usually black or dark 

 bronzy brown; middle tarsus of male similar to that of female, not thickened. 



Subspecies of blackburnii (Fabricius) 10 



Row of longitudinal setigerous punctures which is basally contiguous with the 

 longitudinal carina of the foretibia apically contiguous or only slightly 



327015—55 6 



