NORTH AMERICAN GEOTRUPINAE — ^HOWDEN 165 



Pronotum with black median spot or stripe, black distal area of elytron 

 usually well separated from the black sutural stripe. 



tumefactum (Palisot de Beauvois) 



3. Punctures of elytral striae and dorsal surface (besides some of the margmal 



punctures) bearing at least a few fine long erect yellow hairs 4 



Punctures of elytral striae and dorsal surface (except in some cases the mar- 

 ginal punctures) without hairs 8 



4. Elytron with a large distal black area which is confluent with posterior half of 



black sutural stripe pusillum Dawson and McCoUoch 



Elytron with black spot which is separated from both sutural stripe and lateral 

 margin 5 



5. Black spot of elytron almost twice as long as wide; black sutural stripe of 



elytron continuing around the posterior half of lateral margin; posterior of 

 pronotum with black markings pronounced and extending beyond margined 



edge 6 



Black spot of elytron almost circular; black sutural stripe of elytron not 

 extending around lateral margin; posterior of pronotum with only a vague 

 black line 7 



6. Pronotum and elytra with many long hairs; portions of lateral margins of 



pronotum black; entire posterior pronotal margin black with median black 



toothlike mark cartwrighti, new species 



Pronotum and elytra with a few short hairs; lateral margins of pronotum 

 without any trace of black; only lateral portions of posterior margin of 

 pronotum black ritcheri, new species 



7. Body shape oval; vertex and pronotum densely, coarsely punctured; vague 



circular postmedian elytral spot confined to posterior half of elytron; 

 lateral lobe of male genital capsule about 1.3 times as long as wide. 



quadricornum Robinson 



Body shape elongate; vertex and pronotum at most moderately coarsely 



punctured; vague circular postmedian elytral spot confined to posterior 



third of elytron; lateral lobe of male genital capsule about 1.8 times as 



long as wide elongatum, new species 



8. Elytron with slightly postmedian black spot which is separated by approxi- 



mately its own width from both the black sutural stripe and the lateral 



margin 9 



Elytron with distal black area which is confluent with apical half of either 

 sutural stripe, or with lateral margin, or with both 10 



9. Elytral spot almost circular; black border at posterior of pronotum usually 



extended forward at the midline, making a spikelike pattern; pronotal 

 declivity coarsely punctate only in apical half. 



biplagiatum Dawson and McCoUoch 



Elytral spot almost twice as long as wide; basal black border of pronotum 



not projecting forward at midline; pronotal declivity with at least the apical 



two-thirds coarsely punctate confusum Brown 



10. Lateral margin of elytron in front of distal black area with at least a faint 



black band extending forward to the humeral angle 11 



Lateral margin of elytron in front of distal black area without any black 

 markings (Arizona and Mexico) . . . pusillum townesi, new subspecies 



11. Vertex of head closely covered with coarse punctures; second elytral stria 



very feeble, but evident 12 



Vertex of head sparsely covered with fine punctures; second elytral stria 

 absent lepidlssimum Brown 



