APPENDIX B. 



Species described by authors, but op which no specimens 



COULD be obtained. 



1. ToxicopIliS atrofusCUS, Teoost.— Body above dusky, with 

 liglit rhomboidal dorsal blotches of smoky gray, disappearing entirely near 

 the tail, which is black. 



Syn. Toxicophis airofuscus, Troost. Ann. Lye. Nat. Hist. N. Y. Ill, 

 1836, 190. 



Acondas airofuscus, Troost. ibid 180. 



Trigonocephalus airofuscus, Holbr. N. Amer. Herp. Ill, 1842, 43. PI. ix. 



" Upper part of the head dark-brown, bordered with gray, which 

 becomes lighter behind the eyes, with a dark longitudinal spot reach- 

 ing from the orbit to the tympanal bones. Upper lip white, termi- 

 nating near the tip in gray. Body dusky, variegated with brown 

 spots of smoke-gray ; broadest on the back, and disappear on the tail, 

 which is black. Throat marked with black and white, the latter 

 color predominating; belly irregularly spotted with black and white, 

 darkest towards the tail, and in all parts the white is minutely dotted 

 with black." — Holbrook. 

 Tennessee. 133. 25+18. — 25. ^. Dr. G. Troost. 



The species probably belongs really to the genus A<jkistrodon, 

 Beauv. 



2. Coluber testaceus, Say. — " Body above pale sanguineous or 

 testaceous ; beneath sanguineous, immaculate." — Say. 



iSyn. Coluber lestaceus, Say in Long^s Exped. Rocky Mts. II, 1823, 48. — 

 Harl. Journ. Acad. Nat. Sc. Philad. V, 1827, 348; and Med. & Phys. Res. 

 1835, 113.— HoLBK. N. Amer. Herp. Ill, 1842, 63. PI. xiii. 

 150 



