INTRODUCTION. 



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12.* Eutainia radix, B. & G AVisconsin 34 



13.* " elegans, B. & G.. California 34 



14.* " vagrans, B. & G Mex., Cal., Oregon 35 



15.* " Marciana, B. & G Ark., Texas 3G 



16. " coucinua, B. & G..! Oregon 146 



NERODIA, B. & G. 



1. Nerodia sipedon, B. & G Mich., Mass., Penna.,N.Y., Md.. 88 



2. " fasciata, B. & G South Carolina 39 



3. " erythrogaster, B. & G La., S. C 40 



4.* " Agassizii, B. & G Lake Huron 41 



5.* " Woodhousii, B. & G Texas 42 



6. " taxispilota, B. & G Georgia 43 



7.* " Holbrookii, B. & G Louisiana 43 



8. " niger, B. &G Massachusetts 147 



9. " rhombifer, B. & G Arkansas 147 



10. " transversa, B. & G Arkansas 148 



REGINA, B. & G. 



1. Regina leberis, B. & G Mich., Ohio, Penna 45 



2. " rigida, B. & G Penna., Georgia 46 



3.* " Grahamii, B. & G Texas 47 



4.* " Clarkii, B. &G Texas 48 



NINIA, B. & G. 

 1.* Ninia diademata, B. & G Mexico. 



49 



HETERODON, Beauv. 



1. Heterodon platyrhinos, Latr Penna., Va., S. C, Ohio, Miss... 51 



" cognatus, B. & G Texas 54 



" niger, Troost Penna., S. C, Miss 55 



atmodes, B. & G Ga., S. C 57 



" simus, HoLBK S. C, Miss 59 



" nasicus, B. & G Ark., Texas, Sonera, Cal 61 



2.* 



3. 



4.* 



5. 



6. 



PITUOPHIS, HoLBR. 



1. Pituophis melanoleucus, IIolbr... Carolina 65 



2. " belloua, B. & G Texas, Cal., Sonora 66 



3.* " McClellauii, B. & G Arkansas 68 



4. " catenifer, B. & G California 69 



5.* " Wilkesii, B. & G Oregon 71 



6.* " annectens, B. & G California 72 



SCOTOPHIS, B. & G. 



1. Scotophis alleghaniensis, B. & G... Pennsylvania 73 



2.* " Lindheimerii, B. & G Texas 74 



3,* " vulpinus, B. & G Mich., Wise 75 



