COLEOPTERA. 203 



7. A. megalops n. sp Gulf. 



S. A. lugens n. sp Atlantic. 



9. A. plicipennis n. sp. — (Schwarz i. litt.) Pacific. 



10. A. agnatus n. sp Pacific. 



11. A. Sayi n. sp Pacific. 



12. A. amabilis n.sp ; Atlantic. 



13. A. flavicomis (Erichs.) — Gen. p. 733 Atlantic, Lakes. 



geniculatus Say — Trans. Am. Phil. Soe. IV. p. 458. 



14. A. annularis (Erichs.) — Gen. p. 735 Atlantic, Lakes. 



15. A. perforatus n. sp Arizona. 



1(5. A. nitescens n. sp Gulf. 



17. A. pollens n. sp Pacific. 



18. A. patens n. sp Rocky Mts. 



19. A. reconditus n. sp Atlantic, Lakes. 



20. A. propinquus n. sp Atlantic. 



21. A. canadensis n. sp Lakes. 



22. A. pinguis n. sp Pacific. 



23. A. utenis n. sp Rocky Mts. 



24. A. trajectus n. sp Rocky Mts. 



25. A. papagonis n. sp Arizona. 



26. A. obsoletus n. sp Lakes. 



27. A. artus n. sp Atlantic. 



28. A. dilutus n. sp Gulf. 



29. A. meridionalis u. sp. — (Schwarz i. litt.) Gulf. 



30. A. callosus (Erichs.) — Gen. p. 737 Atlantic, Gulf. 



31. A. varipes n. sp Lakes. 



32. A. arculus (Erichs.) — Gen. p. 744 Atlantic, Lakes. 



33. A. punctatus (Erichs.) — Gen. p. 744 Atlantic, Lakes. 



34. A. dissentiens n. sp Lakes. 



35. A. Hubbardi n. sp Lakes. 



36. A. leetulus n. sp Pacific. 



37. A. leviceps n. sp Pacific. 



38. A. politulus n. sp Pacific. 



39. A. simiolus n. sp Lakes. 



40. A. pertinax n. sp Rocky Mts. 



41. A. lucidus n. sp Pacific. 



Unrecognized Species. 

 ? A. chalybeus Boh.— Res. Eugen. 1858, p. 33 California. 



In considering geographical distribution in the following table the 

 only regions taken into account are those of the Lakes, the Atlantic, 

 and the Pacific, not only because they are the only ones which are at 

 all thoroughly explored, but on account of their continuity along the 



