NORTH AMERICAN GEOTRUPINAE — HOWDEN 319 



9. Head of third instar of G. splendidus splendidus (Fabricius) 



10. Tip of right mesothoracic leg of third instar of G. hornii. 



11. Left mandible of third instar of G. egeriei. 



12. Right mandible of third instar of G. egeriei. 



13. Left mandible of third instar of G. splendidus splendidus. 



14. Right mandible of third instar of G. splendidus splendidus. 



15. Caudal view of last abdominal segment of third instar of G. hornii. 



16. Tip of right mesothoracic leg of third instar of G. erjeriei. 



17. Caudal view of last abdominal segment of third instar of G. egeriei. 

 Symbols: A, antenna; AA, setae of anterior angle of frons; AF, anterior frontal 



setae; AS, antennal segment; BP, bifurcate process; EFS, exterior frontal seta; 

 ESF, endoskeletal figure; L, labrum; MO, molar area, PFS, posterior frontal 

 seta; SA, scissoral area; SE, sensory organ; TU, tubercle. 



Plate 8 



1. Epipharynx of third instar of Geotrupes splendidus splendidus (Fabricius). 



2. Labium and hypopharynx of third instar of G. blackburnii blackburnii (Fa- 



bricius). 



3. Maxilla, labium, and hypopharynx of third instar of G. splendidus splendidus. 



4. Epipharynx of third instar of G. egeriei Germar. 



5. Labium and hypopharynx of third instar of G. blackburnii excrementi Say. 



6. Maxilla, labium, and hypopharynx of third instar of G. egeriei. 



7. Epipharynx of third instar of G. hornii Blanchard. 



8. Labium and hypopharynx of G. hornii. 



Symbols: CPA, chaetoparia; DX, dexiotorma; ETA, anterior epitorma; ETP, 

 posterior epitorma; GL, glossa; LT, laeotorma; MSA, maxillary stridulating area; 

 O, oncylus; SEN, sensilla. 



Plate 9 



1. Epipharynx of third instar of Peltotrupes youngi, new species. 



2. Caudal view of last abdominal segment of third instar of P. youngi. 



3. Head of third instar of P. youngi. 



4. Left mandible of third instar of P. youngi. 



5. Maxillae, labium, and hypopharynx of third instar of P. youngi. 



6. Right mandible of third instar of P. youngi. 



Symbols: A, antenna; AN, anal lobe; BP, bifurcate process; CPA, chaetoparia; 

 DX, dexiotorma; ETA, anterior epitorma; ETP, posterior epitorma; GL, 

 glossa; L, labrum; LT, laeotorma; MO, molar region; MSA, maxillary stridula- 

 tory area; O, oncylus; PFS, posterior frontal setae; PH, phoba; SN, scissorial 

 notch. 



Plate 10 



1. Diagram of brood burrows of Bolboceras darlingtoni (Wallis). 



2. Diagram of burrow of Bradycinetulus ferrugineus (Palisot de Beauvois). 



3. Diagram of brood burrow of Bolboceras farclum (Fabricius). 



4. Diagram of brood burrow of Peltotrupes youngi, new species. 



5. Diagram of brood burrow of Geotrupes hornii Blanchard. 



6. Diagram of brood burrow of G. blackburnii blackburnii (Fabricius) . 



7. Diagram of brood burrow of G. splendidus splendidus (Fabricius). 



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