41 
TROPIDONOTUS SIRTALIS.—Linneus. 
Plate XI. 
Cuaracrers. Head sub-oval, broad, a yellow spot on each occipital plate; 
body thick, dusky above, marked with three longitudinal yellow lines; abdomen 
greenish-yellow, plates with a black blotch near their lateral extremities. Pl. 145. 
Se 00! 
Synonymes. Coluber sirtalis, Linnxus, Syst. Nat., tom. i. p. 383. 
Coluber bipunctatus, Latreille, Hist. Nat. Rept., tom. iy. p. 85, pl. 30, fig. 2. 
Coluber sirtalis, Gmelin, Syst. Nat. Lin., tom. i. pars iii. p. 1107. 
Coluber sirtalis, Zat¢retlle, Hist. Nat. Rept., tom. iv. p. 69. 
Coluber sirtalis, Daudin, Hist. Nat. des Rept., tom. vii. p. 146. 
Coluber sirtalis, Shaw, Gen. Zool., vol. iii. part ii. p. 535. 
Natrix sirtalis, Merrem, Versuch eines Syst. der Amph., p. 132. 
Coluber sirtalis, Hardan, Med. and Phys. Res., p. 116. 
Striped Snake, Vulgo. 
Description. The head is moderately large, flattened, sub-oval, elongated, 
with the snout rounded. The vertical plate is pentagonal, broad in front, and 
rounded where it joins the frontal, and with an angle posteriorly to touch the 
occipital; the superior orbital are single, oblong and projecting, narrowest in 
front. The occipital are large and pentagonal, broad in front, and joined to the 
superior orbital, as well as to the two upper posterior orbital plates. The frontal 
are large, broad, and pentagonal; the anterior frontal are also broad, but quadri- 
lateral, with their posterior and inferior angle prolonged. The rostral plate is 
heptagonal, concave on its inferior margin, for the mouth; there are two nasal 
Vou. IV.—6 
