xii INTRODUCTION. 



Systematic Index of well-ascertained Species of North 

 American Serpents. 



(^The new species are indicated hy an asterisk). 



CROTALUS, Linn. 



Page 



1. Crotalus durissus, Linn Penna., Louisiana, Mississippi.. 1 



2. " adamanteus, Beauv South Carolina 3 



3.* " atrox, B. & G Texas 5 



4. " lucifer, B. & G Oregon 6 



5. " conflueutiis, Sat Arkansas, Texas 8 



6.* " molossus, B. & G Sonora 10 



7. " oregonus, IIoLBR Columbia Biver 145 



CROTALOPHORUS, Gray. 



1. Crotalophorus miliarius, HoLBR.... Georgia, South Carolina 11 



2.* " censors, B. & G Texas 12 



3. " tergeminiis, Holer Wise. Mich. Ohio 14 



4.* " Edwardsii, B. & G Mexico, Sonora 15 



5. " Kirtlandii, HoLBR Ohio 16 



AGKISTRODON, Beauv. 



1. Agkistrodou contortrix, B. & G....Ohio, Penna., S. C, La 17 



TOXICOPHIS, Troost. 



1. Toxicophis piscivorus, B. & G Louisiana 19 



2.* •' pugnax, B. & G Texas 20 



ELAPS, FiTZ. 



1. Elaps fulvius, Cuv South Carolina 21 



2.* " tenere, B. & G Texas 22 



3.* " tristis, B.&G Mississippi, Texas 23 



EUTAINIA, B. & G. 



1 Eutainia saurita, B. & G Mass., Penna., N. Y., Md., Va... 24 



2.* " Faireyi, B. & G Louisiana 25 



proxima, B. & G Ark., Texas, New Mexico 25 



infernalis, B. & G California 26 



Pickeringii, B. & G Oregon 27 



parietalis, B. & G Texas 28 



leptocephala, B. & G Oregon 29 



sirtalis, B. & G Me., Mich., N. Y., Penna., Md., 



Va., S. C, Miss 30 



dorsalis, B. & G Texas 31 



ordinata, B. & G Georgia 32 



ordiuoides, B. & G California 33 



3. 

 4. 

 5.* 

 6. 



7.* 



9.* 

 10. 

 11. 



