598 Wisconsin Academy of Sciences, Arts , cmd Letters. 
EXPLANATION OF PLATE XXXII. 
Fig. 35. Brady cinctus ferrugineus Burm.: labial structures (X 15). 
Fig. 37. Bolboceras farctus Fab.: mandible (X 15). 
Fig. 38. Bolboceras farctus Fab.: labium (X 50), showing the rudiments 
of the inner lobes. 
Fig. 39. Bolboceras lazarus Fab.: epipharynx (X15). 
Fig. 40. Bolboceras lazarus Fab.: mandible (X 15). 
Fig. 41. Oeotrupes egeriei Germ.: epipharynx (X 15). 
Fig. 42. Geotrupes egeriei Germ.: mandible (X 15), showing the well de¬ 
veloped conjunctivus, and the lacinia forming one of the teeth 
of the mandible. 
Fig. 43. Geotrupes egeriei Germ.; maxilla (X 15). 
Fig. 44. Geotrupes egeriei Germ.: hypopharynx and labial lobes (X 15). 
Fig. 45. Geotrupes egeriei Germ.: hypopharynx and proximal part of 
inner lobes (X 50). 
Fig. 46. Cloeotes aphodioides 111.: epipharynx (X 50). 
Fig. 47. Cloeotes aphodioides Ill.: mandible (X 50). 
Fig. 48. Trox scutellaris Say: epipharynx (X15), showing the beginning 
of chitinization from the edges inward. 
Fig. 49. Trox scutellaris Say: mandible (X 15); the lacinia greatly re¬ 
duced, molar absent, and the place of the conjunctivus indi¬ 
cated by a whorl of hairs. 
Fig. 50. Trox scutellaris Say: maxilla (X15). 
Fig. 51. Trox scutellaris Say: labial structures (X 50). The hypopharynx 
has entirely disappeared. 
Fig. 52. Hoplia trifasciata Say: epipharynx (X 50), showing the pro¬ 
gressive chitinization from the edges inward (compare Fig. 48). 
Fig. 53. Hoplia trifasciata Say: mandible (X 50). 
Fig. 54. Hoplia trifasciata Say: labial structures (X 50); entire disap¬ 
pearance of hypopharynx and labial lobes; and a beginning of 
chitinization at the edges, similar to the process going on in 
the epipharynx. 
Fig. 55. Dichelonycha elongata Fab.: epipharynx (X 50). 
Fig. 56. Dichelonycha elongata Fab.: mandible (X 50). 
Fig. 57. Dichelonycha elongata Fab.: maxilla (X 50). Part of the pal¬ 
pus is not shown. 
Fig. 58. Dichelonycha elongata Fab.: labial structures (X 50). 
Fig. 59. Serica sericea Ill.: epipharynx and labrum (X 15). 
Fig. 60. Serica, sericea Ill.: epipharynx (X 50), showing reduced sensory 
area. 
Fig. 61. Serica sericea Ill.: mandible (X 15). The tooth is formed en¬ 
tirely by the lacinia. 
Fig. 62. Serica sericea Ill.: maxilla (X 50). 
Fig. 63. Serica sericea Ill.: labial structures (X 15). 
Fig. 64. Macrodactylus subspinosus Fab.: epipharynx (X 50). 
Fig. 65. Macrodactylus subspinosus Fab.: mandible (X 50). 
Fig. 66. Macrodactylus subspinosus Fab.: maxilla (X 50). 
Fig. 67. Macrodactylus subspinosus Fab.: labial structures (X 50), 
showing rudiments of the inner lobes. 
Fig. 68. Diplotaxis sordida Say: maxilla (X 50). 
Fig. 69. Diplotaxis sordida Say: labial structures (X 50). 
Fig. 70. Lachnosterna fusca Froh.: labrum (X 15), showing rudiments 
of epipharynx. 
Fig. 72. Anomala minuta Burm.: epipharynx (X 50). 
