Insects. 



3713 



Notes on the Distribution of Insects in Geographical Regions. — The resemblance 

 of the productions of mountains from the bases to the summits to those of the hemi- 

 spheres from the equator to the poles, or to some shorter and intermediate space, has 

 often been remarked ; and the numerous elevations of land present an equal number 

 of more or less perfect images of each hemisphere. The valley of each river, from its 

 source to the sea, comprising the valleys of its tributaries, may form a natural division 

 in the geographical distribution of creatures, and the aquatic species have generally 

 the most extensive range along its course. The valleys near each other, and of small 

 extent, and of mostly similar productions, may be grouped together, and those of the 

 tributaries of the largest streams may form subdivisions in the descriptions of these 

 regions. The following list contains the names of some of the principal river-valleys, 

 omitting those of the British Isles : — 



30. Petchora 



31. Obe 



32. Genesei 



33. Piasina 



34. Khatanga 



35. Anabarsk 



36. Olia 



37. Olensk 



38. Lena 



39. Lana 



40. Anabara 



41. Indigurca 



42. Kolima 



VIII. Sea of Kamtchatka Valleys. 



43. Anadir 



44. Apuka 



45. Kamtchatka 



IX. Sea of Okotsk Valleys. 



46. Talovka 



47. Kova 



48. Okota 



49. Ouda 

 60. Amoor 



X. Yellow Sea Valleys. 



51. Hoangho 



52. Yangtsu-Kiang 



53. Pei-ho 



XI. Chinese Sea Valleys. 



54. Hong 



55. Sang-Koi 



56. Min 



57. Camboja 



26. Olia XII. Gulf of Siam Valleys. 



27. Tudejesko 58. Menam 



28. Kolima 59. Sulwein 



29. Anadir 60. Irawaddy 

 X. 3 F 



I. Northern Ocean Valleys. 



1. Tora valley 



2. Alten 



II. North Sea Valleys. 



3. Glommen 



4. Odderan 



5. Clara 



6. Scheld 



7. Ems 



8. Rhine 



9. Weser 



10. Elbe 



III. Baltic Valleys. 



11. Oder 



12. Vistula 



13. Memel 



14. Dvina 



IV. Gulf of Bothnia Valleys. 



15. Ljusna 



16. Indals 



17. Angermanna 



18. Win del 



19. Pitea 



20. Lulea 



21. Tornea 



V. Gulf of Finland Valleys. 



22. Volga 



VI. White Sea Valleys. 



23. Onega 



24. Dvina 



25. Meyen 



VII. East Arctic Ocean Valleys. 



