CROCODILIANS, LIZARDS, AND SNAKES. 



571 



The largest species of the geuus, equaling many of the Ameivas in 

 dimensions. Plates of the collar graduating anteriorly into the poste- 

 rior gular, the series (concave anteriorly in the middle, leaving smaller 

 scales on the margin. Anterior gulars abruptly hirger, the median 

 largest. Xostril in nasorostral; superorbitals four, frontoparietals 

 separated. Interparietal (in adult) nearly as broad as long; parietals 

 large. Infralabials five. I'reanals in four transverse series, the pos- 

 terior two containing six. Tibials four, femorals seven, abdominals 

 eight, antebrachials (often an unreliable character) lour, brachials seven- 

 rowed. Dorsal scales minute. Above olive-brown, with three brown 

 bands on each side, which are as wide as the intervals between them, and 

 are so broken by si)ots of the gr.)und-col()r as to resemble series of con- 

 fluent brown variations. Posterior extremities coarsely reticulate with 

 the same color. Superior surface of tail and gular region blackish 

 varied; abdominal shields black tipped. Under suiface of tail and 

 hinder extremities yellow. Upijer surface crossbarred, so as to appear 

 annulate in some specimens. 



Differs from the C ie.sseUatus, its nearest ally, in its smaller and 

 more numerous preanal plates, its smaller dorsal scales, and broader 

 light bands, as well as in its superior size. 



Cnemidopliorus majcimus Cope. 



mens. 



12636 

 12662 

 12658 



Locality. 



When 

 collected. 



From whom received. 



Cape St. Lucas, L. Call- J.Xantus. 



Ibrnia. 



La Paz, L. Ualiloriiia Feb.—, 1882 L. Belding. 



do I do do. 



Espiritu Santa Island do. 



Nature of 

 specimeu. 



Alcoholic. 



do. 

 do. 

 do. 



This species varies in the number of its anal ])lates, some specimens 

 having fewer than others. The brachial i)lates also vary in number 

 from six to eight rows. Two young .specimens (Cat. No. 12{).")8), in which 

 the umbilical fissure is still open, are about as large as the adult G. 

 sexlineatns. They have a median dorsal light stripe, and two on each 

 side on a blackish ground. Each of the two dark bands thus inoduced 

 is marked by two rows of pale spots. In this they differ from the 

 spotted striped forms of the C. icsscllatus and C. gntiatus^ which have 

 but one series of such s])ots. The femur and tibia are crossbarred, and 

 the former is not marked with a longitudinal stripe behind. 



CNEMIDOPHORUS TESSELLATUS Say. 



Cnemidopliorus tes-sellatiis Baird, U. S. Pac. R. R. Surveys, X, 1859, Gunnison's 

 Report, p. 18. —Cope, Clieck List Biitr. Rept. N. Anier., 1875, p. 4G; Trans. 

 Amer. Pliil. Soc, 1892, p. 33. 



Aineiva iessellata Say, Long's Exped. Rocky Mts., II, 1823, p. 50. 



Scales of the back and sides generally coarse, .5 mm. in diameter. 

 Scales of the collar not larger than those of the throat, the edge of the 



