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, 
Crorauus TRISERIATUS Wiegm., Mus. Berol. 
Uropsopuus TRISERIATUS Wagler, 1830, Syst. Amph., p. 176. 
‘“Notaeo olivaceo serie macularum in spina dorsi irregularium rhom- 
bearum, rufuscenti-fuscarum, margine antico nigro-limbatarum, serie macv- 
larum minorum, ejusdem forme ac coloris in utroque latere, posteriorum 
cum mediis confluentium, anteriorum a mediis taeniola pallida diremtarum ; 
gastraeo nigricante versus collum albescente; vitta pone oculos rufo-fusca,” 
Mexico. (Wagler.) 
CROTALUS ADAMANTEUS. 
Beauvois, 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 
(8—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 (8—4) rows of scales between sub- 
orbitals and labials. Labials 14—16, first and fourth larger. Infralabials 
15 
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- 
19. Submentals one pair, large. Scales pointed, with strong keels, 
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 
pands 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, 
