sii INTRODUCTION. 



Systematic Index of well-ascertained Species or North 



American Serpents. 



(7%e new species are indicated hy an asterisk). 



CROTALtJS, Linn. 



Page 



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



2. " adamaiiteus, Beauv South Carolina 3 



3.* " atrox, B. & G Texas 6 



4. " lucifer, B. & G Oregon 6 



5. " confluentus, Say Arkansas, Texas 8 



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



7. " oregonus, IIoLBR Columbia River 145 



CROTALOPHORUS, Gray. 



1. Crotalopliorus miliarius, Holbe. ...Georgia, South Carolina 11 



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



3. " tergeminus, Holbr 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 MississiiDpi, Texas 23 



EUTAINIA, B. & G. 



I. Eutainia saurita, B. & G Mass., Penna., N. Y., Mel, Va... 24 



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



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



4. " infenialis, B. & G California 26 



5.* " Pickeringii, B. & G Oregon 27 



6. " parietalis, B. & G Texas 28 



7.* " leptocephala, B. & G Oregon 29 



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



Va., S. C, Miss 30 



9.* " dorsaHs, B. & G Texas 31 



10. " ordinata, B. & G Georgia 32 



II. " ordinoides, B. & G California 33 



