606 ADDENDA AND CORRIGENDA. 
mad 2. Page 240. Tropidonotus rigidus. 
Regina rigida, Bocourt, Miss. Sc. Mex., Rept. p. 748, pl. liii. fig. 7 
(1893). 
Ada ts Page 242. Tropidonotus anoscopus. 
a. do (V. 144; C. ?). --— + Christiania Mus, 
TEE Biee Page 242. Tropidonotus fasciatus. 
Tropidonotus rhombifer, Bocourt, Miss. Se. Mex., Rept. p. 751, pl. liv. 
fig. 5 (1893). 
anomalus, Werner, Zool. Anz. 1893, p. 362. 
Natrix fasciata, Loennberg, Proc, U.S. Nat. Mus. xviii. 1894, p. 331. 
—— fasciata pictiventris, Cope, Am. Nat, 1895, p. 677. 
—— sipedon, Rhoads, Proc. Ae. Philad, 1895, p. 387. 
A. Forma typica. 
r. do (Sc. 25; V. 143; Wisconsin. Christiania Mus. 
C. 69). 
s. Yg. (Sc. 23; V. 132; Alabama. Christiania Mus. 
C. 68). 
D. Var. rhombifer. 
e. d (Sc. 27; V. 146; New Orleans. Christiania Mus. 
C. 75). 
hade— Page 244. Tropidonotus cyclopium. 
Natrix ecyclopion, Loennberg, Proc. U.S. Nat. Mus. xvii. 1894, 
p. 382. 
Add:— Page 245. Tropidonotus taxispilotus. 
Natrix taxispilota, Loennberg, 1. ¢. p. 382. 
e. Yg. (Sc. 31; V.138; Pensacola, Florida. Christiania Mus, 
©. 75). 
Page 246. Add a species :— 
47a. Tropidonotus variabilis, ; 
Hemigenius variabilis, Dugés, Proc. Amer, Philos. Soc. xxv. 1888, 
Pies} fig.; Bocourt, Miss. Se. Mex., Rept. p. 741, pl. liii. fig. 5 
Posterior maxillary teeth abruptly enlarged. Eye moderate. 
Rostral broader than deep, visible from above; internasals shorter 
than the prefrontals ; frontal once and a half as long as broad, 
longer than its distance from the end of the snout, shorter than the 
parietals; loreal as long as deep; two pre-and two. postoculars ; 
temporals 142; seven upper labials, third and fourth entering the 
eye; four lower labials in contact with the anterior chin-shields, 
which are longer than the posterior. Scales in 15 rows, strongly 
