CONTENTS. IX 



Page. 

 Neuroptera : 



Mesothemis composita 7*28 



Myrineleon diversus 729 



Mallophaga : 



Meuopon picicola 731 



Goniodes Merriamauus 731 



mepbititlis 732 



Nirraus buteonivorus 733 



Docophorns syruii 733 



Parasitic worms : 



Eustrongylus buteouis , 735 



cbordeilis 736 



Akachnida : 



Argas Americana 740 



Plants : 



Dicentra uniiJora 760 



Peziza Vulcaoalis 792 



Sphaeria Coulteri 792 



LIST OF ILLUSTRATIONS. 



WOOD-CUTS, 



^"^o. Page. 



1. Modern lake deposits, capped with basalt, two miles above Boteler's Ranch, 



valley of the Yellowstone 29 



2. Trachyte dike, and columns of breccia, Yellowstone Valley 37 



3. Volcanic tuffs and breccia, Yellowstone Valley 38 



4. Volcauic breccia at the head of Canon and Rock Creeks 39 



5. Section of vertical strata at Cinnabar Mountain and Devil's Slide 41 



6. Extinct geyser. East Fork of the Yellowstone 45 



7. Carbouiferons limestone section of Soda Butte 46 



8. Index and Pilot Peaks 47 



9. Basaltic columns, Yellowstone, near mouth of Tower Creek 50 



10. Yellowstone Lake, (east side) 51 



11. Wall of basalt, Yellowstone River, at Mud Springs : 51 



12. Hot spring, southwest of Yellowstone Lake 52 



13. Camp of United States Geological Survey, on shore of lake 53 



14. United States Geological Survey en route 53 



15. Yellowstone Geysers 54 



16. Terraces, valley of the Madison : 62 



17. Banded gneiss , 67 



18. Dike on the Missouri 68 



19. Exposure of Silurian shales, eight miles below the Three Forks 69 



20. Section across the Missouri below the Three Forks 71 



21. Connection between Missouri and Gallatin 72 



22. Silurian beds of the Gallatin : 73 



23. Deceptive weathering, Liberty Peak 76 



24. Section through Flathead Pass 84 



25. Block of granite with feldspathic seams 106 



26. Arch in Spring Canon 109 



27. Section of the beds in Spring Canon HO 



27a. Section from Spring Canon to Bridger Peak 113 



28. Section of coal-bed 114 



29. Second canon of the Yellowstone River 119 



