10. TRoPmoNoTUs. 193 
Bibr. Erp. Gén. vii. p. 549 (1854); Giinth. Cat. Col. Sn. p. 59 
1858), and t. Bri Ind. 258 (1864) ; Jan, Arch, Zool. yo 
1256) iii. 1 203; Bouleng. Faun, Ind., Rept. p. 341 
Nein Bonds: Mem. Ace. Torin. (2) ii. 1889, Cope, Proc. 
U.S. Nat, Mus. xi. 1838, p. 392, and xiv. 1 - O6r. 
Eutainia, Baird § Gir. Cat. N. Am. Rept. p 2 iy ost Cope, Proc. 
U.S. Nat. Mus. xiv. 1892, p. 645. 
Nerodia, Baird § Gir. 1. c. BS 38. 
Baird § Gir. 1. c. 
Leptophis, part., Dum. § Bir t. c, p. 528, 
Amphieas, part. Dum. § Bibr, t. e. p. 724; Jan, l. ¢, p. 232. 
Thamnophis, Cope, Proc. Ac. Philad. 800, p. 369. 
ag eee Gtinth. Proce. Zool. Soc, 1860, p. 156, and Rept. Brit. 
nd, 5 
Natrix, Giinth. Ann. § Mag. N. H. (3) ix. 1862, p. 124. 
acres og? part., Jan, Elenco sist. Ofid. p. 82 (1863). 
Neusterophis, Giinth. Proc. Zool, Soc. 1863, p. 16. 
Styporhynchus, Peters, Mon. Berl. Ac. 1863, p. 399. 
meee (non D. § B.), Jan, Arch. Zool. Anat. Phys. iii. 1865, 
Tropidonophis, J Ya e. p. 245. 
Fowlea, Cat. Rept. As. Soc, Mus. p. 57 (1868). 
mew fort Bee: , in Wheeler's Rep. Explor. Surv. W. 100th Mer. v. 
( 
Katophis, Macleay, Proc, Linn. Soc, N.S. W. ii. 1877, p. 36. 
Atomarchus, 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. 5b. 
Stypocemus, Cope, Proc. Am. 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; ventrals 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. 
I. Maxillary teeth not more than 30, the hinder gradually enlarged ; 
eyes and nostrils lateral ; internasal shields broadly truncate 
anteriorly. (TRorrponorvs.) 
A. Anal shields single ; a single anterior temporal *, 
1. Second row of scales keeled. 
* Butenia nigrolateris, Brown, with three anterior temporals, is probably 
based on an anomalous individual. 
VoL. I. 0 
