CONTENTS 



PAGE 



38. Hypsiglena 779 



ochrorhynchus 



ochrorhynchus (Spotted Night Snake).. 780 



39. Natrix 783 



valida (Western Water Snake) 78+ 



40. Thamnophis 787 



sirtalis 



parietalis (Prairie Garter Snake) 792 



concinnus (Northwestern Garter Snake) 795 



infernalis (Pacific Garter Snake) 802 



eques (White-bellied Garter Snake)... ._... 808 



ordinoides 



ordinoides (Puget Garter Snake) 812 



atratus (Coast Garter Snake) 817 



elegans (Mountain Garter Snake) 824 



vagrans (Wandering Garter Snake) 829 



biscutatus (Klamath Garter Snake) 834 



couchii (Giant Garter Snake) . 838 



hammondii (California Garter Snake) 843 



marcianus (Marcy's Garter Snake) 849 



megalops (Mexican Garter Snake) 852 



angustirostris (Brown -spotted Garter Snake) 855 



41. Sonora 858 



occipitalis (Tricolor Ground Snake) 859 



semiannulata (Bicolor Ground Snake) 863 



episcopa (Striped Ground Snake) 866 



42. Chilomeniscus _. 868 



cinctus (Banded Burrowing Snake) 869 



punctatissimus (Island Burrowing Snake) 872 



stramineus (Dotted Burrowing Snake)_ — 874 



43. Tantilla 875 



eiseni (California Tantilla) 876 



nigriceps (Sonoran Tantilla). 878 



planiceps (Lower California Tantilla) 880 



wilcoxi (Arizona Tantilla) _ 882 



44. Trimorphodon 884 



lyrophanes (Lyre Snake) 884 



