10. TKOPIDONOXUS. 193 



Bihr. Erp. Qen. vii. p. 549 (1854) ; Gunth. Cat. Col. Sn. p. 59 



(1858), and Rept. Brit. Ind. p. 258 (1864) ; Jan, Arch. Zool. Anat. 



P/ii/s. iii. 1865, p. 203 ; Bouleng. Faun. Ind., Rept. p. 341 



(ISi)O). 

 Natrix, Bonap. Mem. Ace. Torin. (2) ii. 1839, p. 436 ; Cope, Proc. 



U.S. Nat. Mus. xi. 1838, p. 392, and xiv. 1892, p. 667. 

 Eutainia, Baird ^ Gir. Cat. N. Am. Rej^t. p. 24 (1863) ; Cope, Proc. 



U.S. Nat. Mus. xiv. 1892, p. 645. 

 Nerodia, Baird c^- Gir. I. c. p. 38. 

 Rogina, Baird v^- Gir. I. c. p. 45. 

 Leptophis, part.. Dam. ^- Bibr. t. c. p. 528. 

 Amphiesma, part., Dum. Sf Bihr. t. c. p. 724 ; Jan, I. c. p. 232. 

 Thamnophis, Cope, Proc. Ac. Phi/ad. 18u0, p. 309. 

 Herpetoreas, G'dnth. Proc. Zool. Soc. 1860, p. 156, and Rept. Brit. 



Ind. p. 257. 

 Natiix, Gli?ith. Ann. 8r Mag. N. H. (3) ix. 1862, p. 124. 

 Tliamnosopliis, part., Jan, Elenco sist. Ofid. p. 82 (1863). 

 Neusteropliis, Giinth. Proc. Zool. Soc. 1863, p. 16. 

 Styporbynchus, Peters, Mon. Berl. Ac. 1863, p. 399. 

 Tropidophorus (non D. S)- B.), Jan, Arch. Zool. Anat. Phys. iii. 1865, 



p. 205. 

 Tropidonophis, Jan, I. c. p. 245. 



Fowlea, Theob. Cat. Rept. As. Soc. Mus. p. 57 (1868). 

 Chilopoma, Cope, in Wheelers Rep. Explor. Surv. W. 100^/i Mer. v. 



p. 543 (1875). 

 Katophis, Macleay, "Pi-oc. Linn. Soc. N.S. W. ii. 1877, p. 36. 

 Atomarclius, Cope, Am. Nat. 1883, p. 1300. 

 Bothrodytes, Cope, Proc. Am. Philos. Soc. xxiii. 1886, p. 495. 

 Coluber,' Cope, Bull. U.S. Nat. Mus. no. 32, 1887, p. 59. 

 Stypocemus, Cope, Proc. Ain. Philos. Soc. xxiii. 1886, p. 495. 



Maxillary teeth 18 to 40, posterior longest; mandibular teeth 

 subequal. Head usually distinct from neck ; eye rather small, 

 moderate, or large, with round pupil. Body more or less elongate, 

 cylindrical ; scales mostly keeled, in some species smooth, usually 

 with apical pits, in 15 to 33 rows ; veutrals rounded. Tail mode- 

 rate or long ; subcaudals in two rows. Hypapophyses developed 

 throughout the vertebral column. 



Europe ; Asia ; Africa ; North Australia ; North and Central 

 America. 



/Synopsis of the Species. 



Maxillary teeth not more than 30, the hinder gradually enlarged ; 

 eyes and nostrils lateral ; internasal shields broadly truncate 

 anteriorly. (Tropidonotus.) 



A. Anal shields single ; a single anterior temporal *. 



1. Second row of scales keeled. 



* Eufania nirjrolateris, Erowii, with three anterior temporals, is probably 

 based on an anomalous iudiTidual. 



VOL. I. O 



