112 SYNOPSES AND DESCRIPTIONS. 



nate with a series of smaller spots on the lower edge of the side. Belly 

 yellowish, clouded or mottled. Hab. Mexico to Brazil. 



Crotalus triseriatus. 



Chotalus tbiseriatus Wiigm., -V«.s. Berol. 



Uropsophus tbiseriatus Wagler, 1830, Syst. Amph,, p. 170. 



"Notaeo olivaceo serifi macularum in spina dorsi irregularium rhom- 

 bearum, rufuscenti-fuscarum, margins antioo nigro-limbatarum, serie macu- 

 laruni minorum, ejusdem formse ae coloris in utroque latere, posteriorum 

 cum mediis eonfluentium, anteriorum a mediis taeniola pallida diremtarum ; 

 gastraeo nigricante versus collum albescente; vitta pone oculos rufo-fusca." 

 Mexico, (Wagler.) 



Crotalus adamanteus. 



Beauvw, 1799, Trans. Am. Phil. Soc. IV, 368. 



Stout, fusiform; head large, triangular, broad behind, covered with 

 small scales; tail short, thick. Eye moderate. Two or more pairs of 

 rugose small internasals and prefrontals. Head covered with small keeled 

 scales. Supraciliaries large, rugose, separate from the rostral by three 

 (3 — 4) plates. Rostral higher than broad. Anterior portion of nasal 

 larger, quadrangular, posterior narrow. Anteorbitals two; lower small, 

 angular. Two loreals, or upper united with a small prefrontal. Sub and 

 postorbitals five to six, small. Three (3 — 4) rows of scales between sub- 

 orbitals and labials. Labials 14 — 16, first and fourth larger. Infralabials 

 lfj — 19. Submentals one pair, large. Scales pointed, with strong keels, 

 in 27 — 29 rows, outer broad, with keels obsolete. Ventrals broad, 169 — 

 179 + 1+21—32 (169—188+19—32.) 



Yellowish-brown, with a dorsal series of 27 — 36 rhomboidal yellow-mar- 

 gined, light-centered, dark-brown spots. Single series of yellow scales 

 form the margins; these meet on the fifth or sixth rows on the flank, where 

 they inclose an alternating series of less distinct rhombs and an opposite 

 series of half-rhombs on the outer rows. Posteriorly the spots fuse and 

 become transverse bands. Belly yellowish, more or less blotched or punc- 

 tulate with brown on the bases of the scutes. Tail black or barred with 

 bands of black. A dark band included between narrow white lines from 

 the forehead through the eye to the angle of the mouth. A narrow white 

 line on each side of the pit, nostril, and on each edge of the rostral shield. 



