CHARLES W. METZ. 99 



Smaller, upper extension of lateral face marks narrowed at base, 

 and remote from orbital margin, (fig. 89) riidbeckiae. 



Very small, scape not dilated, upper extension lateral face marks 

 rather stout, not greatly constricted at base, not enlarged 

 greatly at apex (fig. 78), collar dark cressoiii. 



Similar to cressoni but upper extensions of lateral face marks 

 swollen at apices, (fig. 77) ...cressoni var. luag-niclavis. 



Similar to cressoni but face marks irregular and broken, (fig. 83), 

 not extending above antennal sockets. 



cressoni, form saniculae. 



3. Large, abdomen coarsely punctured, (fig. 86) tridentiiliis. 



Small, abdomen impunctate or nearly so, (fig. 87). 



grossicornis (type) . 



4. Supra-clypeal mark absent 5. 



Supra-clypeal mark present 6. 



5. Lateral face marks long, tapering above to tip, (fig. 114). 



polifolii. 



Lateral face marks short, not tapering gradually to tip well above 



antennal sockets, (fig. 115) nevaclensis. 



6. Rather large, upper extension of lateral face marks truncate at 



upper level of antennal sockets, with horizontal projection 

 mesad above sockets, (fig. 85) varifrons. 



Lateral face marks not extending above antennal sockets, face 

 exceedingly broad, (fig. 106) potens, n. sp. 



Lateral face marks broadening above antennal sockets, then taper- 

 ing to a more or less narrow apex on eye margin, abdomen 

 punctured, but not coarsely 7. 



Lateral face marks extending well above antennal sockets, broad- 

 ened and truncate or rounded at apex, scape concave ex- 

 teriorly, not dilated ziziae. 



Lateral face marks not noticeably enlarged above antennal sockets, 

 either short or narrow 8. 



7. Large, upper extension of lateral face marks long and very stout, 



face broad, (fig. 108 ) nieg'alotis. 



Similar but face long, and narrow, lateral face marks with upper 

 extensions not so stout, more narrowed at tip, (fig. 109). 



asininus. 

 Very small, face broadened above, not narrow, (fig. 111). 



cookii, n. sp. 



8. Abdomen coarsely, heavily punctured 9. 



Abdomen impunctate, or with moderate sized punctures 10. 



9. Upper extension of lateral face marks extending about one-half the 



length of scape above sockets, (figs. 103 and 104). 



episcopalis. 



TRANS. AM. ENT. SOC . , XXXVII. 



