LIST OF ILLUSTRATIOIsrS. 



PLATES. 



The Croc ODiLiANs, Li/.akds, and Snakes ok Nohtii America. 



Ry Edward Drinker Cotk. 



Facinjr page. 



1. flyoicl Jiones of Siinii;i Kbiptoglossa ami Acrodonta 1270 



2. llyoicl Boues of Sauri.i Ij^uania and 1 Jiploj'lossa 1270 



3. Hyoid Bones of Sauria Diploglossa, Thecaglossa, and Leptoglossa 1270 



4. Hyoid Bones of Sauria Leptogloesa and Annnlati 1270 



5. Color variations of Cnemidopboius tessellatus and of Cuemidophorus 



gulaiis 1270 



6. Viscera of Typlilops liberlensis Hallowell . > 1270 



7. Viscera of Charina bottie Blainville ... 1270 



8. Viscera of Cbersydrus grauubitns Merreni 1270 



9. Viscera of Coluber qnadrivittatus Holbrook 1270 



10. Viscera of Heterodon ])latyrbinus Ijatreille 1270 



11. Viscera of Crotalus conflueutus Say 1270 



12. Henji})enes of representative types 1270 



13. Hemipenes of Peropoda, Acrocbordidic, and ( 'alauiarina' 1270 



14-l!S. Hemipenes of Colnbriua' 1270 



19. Hemipenes of Colnbrina- and Natricina- 1270 



20. Hemipenes of Natricinn' 1270 



21. Hemipenes of Natricina' and Homalopsinai 1270 



22. Hemi])enes of Lycodontinte 1270 



23. Hemipenes of Droniiclna' and Leptognatbinn' 1270 



24. Hemipenes of Xenodontma' and Dromicina' 1270 



25. Hemipenes of Xenodontina', Dromicina", and Scytalina^ 1270 



26. Hemipenes of Erytbrolamprina- and Scytalina> 1270 



27. Hemipenes of Dromicina', Leptognatbina', Erytbrolamprin;i', and Dipsa- 



dina' 1270 



28. Hemipenes of Dipsadina* 1270 



29. Heiiiii)enes of Proteroglypba and Platycerca 1270 



30. Hemi])enes of Proteroglypba, Platycerca, and Solenoglypba 1270 



31. Hemipenes of Solenoglypba 1270 



32-36. Variations in Marking on Snakes 1270 



XI 



