642 ADDENDA AND CORRIGENDA. 
Page 259. Contia agassizii. 
Is an Opisthoglyphous Snake. See this volume, p. 126 (Pseud- 
ablabes agassizit). 
Add :-— Page 261. Contia collaris. 
im. ¢ (Se.17; V. 171; Tiflis. Tiflis Mus, [E.}. 
C. 62) & 2 (Sc. 17; 
V. 176; C. 57). 
n-o. d (Sc. 15; V. 150; Aresh, Gov. Elizabeth- Tiflis Mus. [E.]. 
C. 58) & Q (Se. 15; pol. 
V. 157; C. 54). 
p. Q (Se. 17; V. 160; C. Mt.Hermon, Palestine. Turin Mus, [E.]. 
59). ‘ 
Page 273. Add a genus :— 
101a. SYMPHIMUS. 
Symphimus, Cope, Proc. Amer. Philos. Soc. xi. 1869, p. 150. 
Apparently agreeing with Chilomeniscus, but rostral shield not 
prominent. 
Mexico. 
1. Symphimus leucostomus. 
Symphimus leucostomus, Cope, J. ¢. 
Snout obtusely pointed. Rostral’as deep as broad, scarcely 
visible from above; suture between the internasals as long as that 
between the prefrontals; frontal longer than broad, with concave 
sides, much shorter than the parietals; one pre- and one or two 
postoculars ; temporals 14+2; seven upper labials, third and fourth 
entering the eye; anterior chin-shields a little longer than the 
posterior. Scales in 15 rows. Olive-grey above, with a light 
brown vertebral stripe three scales wide; lips light yellow; belly 
dirty white. : 
Total length 800 millim.; tail 250. 
Chihuiatan, Tehuantepec. 
ey meee Page 276. Homalosoma lutrix. 
-u. 3 (V. 119, 116, 118; Uganda. F, J. Jackson ° 
PC. 97, 81, 34) & 9 (V. are P)}. » Ta 
134, 122, 126; C. 28, 
19, 22). 
The head-shields yary considerably, and H. shiranum should be 
united with H. lutria. 
