486 REPORT OF NATIONAL MUSEUM, 1893. 



Page. 



Fig. 3.— Protile view of skull of i??aj>s. After J au 357 



4. — Profile view of skull of LampropeJtis. After Jau 3.37 



5. — Color patteru of Flaps. After Jan 357 



6. — Color pattern of LampropeUls. After Jan 357 



7. — Head of Elapsfnh-lna from above. From Baird 360 



8. — Head of Flaps fiilvius from the side. From Baird 360 



9. — Side of head of Rattlesnake, showing the pit 364 



10. — Piece of surface of ejiidermls lining the pit. From Leydig 365 



11. — Skull of Rattlesnake from above. After Jan 366 



12.— Skull of Rattlesnake from side 366 



13.— Skull of Rattlesnake from below 366 



14. — Osteology of poison apparatus of the Rattlesnake. After Mitchell . 367 



15. — Muscles of poison apparatus of Rattlesnake. After Mitchell 367 



16. — Diagram of the bones concerned in raising the fang. After Mitchell . 368 

 17. — Arrangement of the reserve fangs in Bungarus semifasciatits. illus- 

 trating the development of the grooved fang into the caualed fang. 



After Niemann 368 



18. — Poison apparatus of Rattlesnake ; venom gland and muscles. Lateral 



view. After Duvernoy 369 



19. — Longitudinal section of poison fang oi BcAlirops. After Niemann.. 370 



20. — Transverse section of same 370 



21. — Diagram illustrating the succession of the fangs. After Mitchell.. 372 



22. — Palate of Rattlesnake. After Duvernoy. , 377 



23. — Perfect rattle of a large Banded Rattlesnake. Side view. After 



Garman 381 



24. — Longitudinal section through same 381 



25. — Separate segments of a disjointed perfect rattle of a Crotalus. Side 



view. After Czermak 381 



26. — Tail end of embryo of Massasauga. Side view. After Garman 382 



27. — Diagrammatic longitudinal section through same 382 



28. — Tail end of one-week-old Massasauga. Side view. After Garman.. 383 



29. — Diagrammatic longitudinal section through same 383 



30. — Incipient rattle of young Prairie Rattlesnake. Side view. After 



Garman 383 



31. — Diagrammatic longitudinal section through same 383 



32. — Tail end of the Copperhead. Side view. After Garman 392 



33. — Under side of tail of Water Moccasin 400 



34.— Under side of tail of Water Snake, Xatrix 400 



35. — Head of Copperhead from above. After Baird 400 



36. — Head of Copperhead from side 400 



^7. — Head of Spreading Adder (Heterodon) from above. After Baird 400 



38. — Head of Spreading Adder from side 400 



39. — Head of Water Snake (Xatrix) from above. After Baird 400 



40.— Head of Water Snake from side 400 



41. — Head of Aghistrodon contortrix from above. After Baird 403 



42. — Head of Aghistrodon contortrix from side 403 



43. — Head of Agkistrodon jiiscivorus from above. After Baird 407 



44. — Head of Aghistrodon ptiscivorus from side 407 



45. — Head of Sistrurus catenatus from the side, showing color pattern . .. 411 



46. — Head of Sistrurus miliarius from side, showing color })attern 411 



47. — Color pattern of top of head of Sistrurus catenatus 411 



48. — Color pattern of top of head of Sistrurus miliarius 411 



49. — Head of Sistrtirus catenatus from above. After Baird 412 



