596 Wisconsin Academy of Sciences, Arts, and Letters, 
EXPLANATION OP PLATE XXXI. 
Fig. 16. Canthon laevis Drury: hypopharynx and labial lobes of right 
side (X 50). The twisted distal end of the inner lobe is peculiar 
to this genus. 
Fig. 17. Choeridium histeroides Web.: hypopharynx and proximal end 
of lobes of right side, showing the three chitinous teeth at the 
proximal end of the inner lobe (X 150). 
Fig. 18. Pleurophorus caesus Panz.: ephipharynx (X 208). The median 
chitinous area has entirely disappeared. 
Fig. 19. Pleurophorus caesus Panz.: mandible (X 208). 
Fig. 20. Pleurophorus caesus Panz.: maxilla (X 208), the distal part of 
the palpus not shown. 
Fig. 21. Pleurophorus caesus Panz.: labial structures (X 208), showing 
the peculiar shape of the inner lobes. 
Pig. 22. Phanaeus carnifex Linn.: hypopharynx and labial lobes of 
right side (X 50), showing the peculiar armature of the proxi¬ 
mal end of the inner lobes. 
Fig. 23. Onthophagus hecate Panz.; epipharynx (X 50). 
Fig. 24. Onthophagus hecate Panz.: mandible (X 50). 
Fig. 25. Onthophagus hecate Panz.: maxilla (X 50). The distal part of 
the palpus has been omitted. 
Fig. 26. Onthophagus hecate Panz.: hypopharynx and labial lobes of 
right side (X 67). 
Fig. 27. Aphodius jimetarius Linn.: epipharynx (X 50). Notice the 
broad, chitinized median area. 
Fig. 28. Aphodius fimetarius Linn,: hypopharynx and labial lobes of 
right side (X 150). 
Fig. 29. Aphodius granarius Linn.: epipharynx (X 150). 
Fig. 30. Aphodius granarius Linn.: mandible (X 150). 
Fig. 31. Aphodius granarius Linn.: hypopharynx and labial lobes of 
left side (X 150). 
Fig. 32. Bradycinctus ferrugineus Burm.: epipharynx (X 15). 
Fig. 33. Brady cinctus ferrugineus Burm.: mandible (X 15). 
Fig. 34. Bradycinctus ferrugineus Burm.: maxilla (X 15), showing the 
presence of a “digitus” on the lacinia. 
Fig. 36. Bolboceras farctus Fab.: epipharynx (X 15). 
