CONTENTS 13 



PAGE 



40. Thamnophis 787 



sirtalis 



parietalis (Prairie Garter Snake) 792 



concinnus (Northwestern Garter Snake) 795 



infemalis (Pacific Garter Snake) 802 



eques (White-bellied Garter Snake) 808 



ordinoides 



ordinoidcs (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. Sonera 858 



occipitalis (Tricolor Ground Snake) 859 



semiannulata (Bicolor Ground Snake) 863 



episcopa (Striped Ground Snake) — _ 866 



42. Chilomeniscus _ . 868 



cinctHS (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 



Family 14. ELAPiDiE 



887 



45. Micrurus . 888 



euryxanthus (Sonoran Coral Snake) 889 



Family 15. Hydrid^e 891 



46. Hydrus 892 



platurus (Bicolor Sea Snake) 892 



