CROCODILIANS, LIZAKDJS, AND SNAKES. 1133 



ANCISTRODON PISCIVORUS Lacepede. 



Ancislrodon pificiionis Cove, Proc. Acad. Nat. Sci. I'liila., 1859, p. 336; Cheek-list 



N. Amer. Batr. Kept., 1875, p. 34. 

 Croiahis piscivorns Lacepkde, Hist. Serp., II, 1787, p. 124. 

 Snjtaliis piscivoriis Latkeii.i.e, Hist. Nat. Keptiles, III, 1801, p. 163. 

 Natrix piscivoriifi Merrem, Tentanien, 1820, p. 131. 

 Coluber aqiiaikux Shaw, Gen. Zocil., Ill, 1802, j). 425, pi. 3 (from Catesby's Watt;r 



^'iper, Carol., II, 1754, pi. xi.iiij.— Daidix, Hist. Kept., V, 1803, i>. 314.— 



Harlan, Med. Phys. Kes.. 1835, p. 129. 

 Tri(jo)iovephahis piscirorns Holbrook, N. Amer. Merp., Ill, 1842, p. 33, pi. \ii.— 



Dr.MERiL aud Bibrox, Erp. Gen., VII, 1854, p. 1192. 

 Toxicophis pivcivorus Baird and Girard, Cat. N. Amer. Kej)!., Pt. 1., Seip., 1853, 



p 19. 



No siiperior loreal. Inferior ^-all of orbit bouiuk'd by third labial; 

 tweiity-tive dorsal rows of scales. Dark cliestimt-browu, with iiidi.s- 

 tiuct vertical dark bars. Line from superciliary alonj; the edjue of the 

 head through the middle of the temporal scales. A second line, fronj 

 the lowest point of the orbit, parallel to the tirst, across the superior 

 labial plates. 



Scales all wide aud strongly keeled, including those on the .sides 

 aud back of head, exce])t the inferior row of temporals, which aie 

 smooth. First row of dorsal scales with weaker keels than other lows. 

 Two nasal plates with the nostrils between them, the anterior deeper, 

 the posterior longer, Internasals two, one above the other; the upper 

 extending- from the eye to the posterior nasal, the lower linear aud 

 forming the upper wall of the pit. Lower and posterior wall of pit 

 constituted by a narrow plate (inferior loreal) resting- along the third 

 labial and terminating- on the second, Second superior labial elevated, 

 forming- the anterior border of the maxillary fossa and of its superior 

 anterior angle, the largest narrowing upward, and third labial consti- 

 tuting the inferior wall of the orbit, of which three scales form the 

 posterior wall. Upper labials eight, large and broad; the lirst and 

 eighth longer than high, the others higher than long: lower labials 

 eleven, tifth largest; seventh to tenth deeper than long, rostgencials 

 much shorter than pregeneials, .separated by two scales. Parietals suc- 

 ceeded each by a triangular plate, which is rather smaller than an inter- 

 nasal. Teiui)orals 0-5, 5-4, 6-5, the inferior row much the largest. 



General color dark chestnut brown, with darker markings. Head 

 above, i)uiplish black. An obsolete chestnut brown streak passes from 

 the posterior end of the superciliary along the upper edge of the 

 head through the middle of the second row of supralabial scales. A 

 narrow yellowish-white line passes from the third labial, or begins just 

 below the lowest part of the orbit, and passes backward ])arall('l with 

 the first stripe on the side of the neck, where it is contiuent with the 

 yellowish white of the throat. On the lower labials are three short, 

 nearly vertical light bars on the fourth, sixth, and seventh: the rest of 

 the Jaw Itself, as well as the interval between the stripes on the sides 



