CROCODILIANS, LIZARDS, AND SNAKES. 



345 



larger than those on the sides. Abont sixty-four series from head to 

 tail, or about forty-six from cervical fokl ; femoral pores about twelve. 



Color above dark green, becoming nearly black on the middle of 

 back. A conspicuous nuchal black collar, margined before and behind, 

 and banded transversely above with yellowish green: back spotted 

 with the same; head angular, rather i)ointed, but rounded at the end. 

 The first median plate sujjpressed, the second very large. Four rows 

 of plates on the supraorbital region; cephalic plates smooth; scales on 

 the body quite small, there being at least sixty around the middle of the 

 body. A few only of the lower scales are notched. The under surface 

 of tibia and post anal region are smooth. The hind feet are short, the 

 free portion of length not reaching from snout to beginning of occipital 

 plate. The tail is much thickened, decidedly wider behind the anus 

 than at its root. 



There is a broad black collar, which, beginning on and in front of the 

 shoulders, crosses the nape, where it is ten scales long. It is bordered 

 before and behind by yellowish green (the posterior band crossing the 

 shoulders) and crossed centrally above by a transverse bar of the same. 

 From this collar to above the anus, along the middle of the back, are 

 eight or ten indistinct transverse dotted bars of light yellowish green, 

 with smaller and more irregular ones on the sides. The under parts 

 are greenish white; the head beneath and the sides of belly blue. 



This species, with the general appearance of S. torquatns, is readily 

 distinguished by the much smaller scales, without denticulation above. 

 Of these there are more than 00 oblique rows from head to tail, instead 

 of only about 40. 



It differs from *S'. formosus in the smaller scales, and the presence of 

 light margins to the cervical collar and of light spots on the back. 



Sceloiwrits ornalus Baird. 



SCELOPORUS JARROVII Cope. 



Sceloporus Jarrovii Coi'E, Report Expl. Surv. W. of 100th Mer., G. M. Wheeler, 

 Zoology, V, 1875, p. 569, pi. xxm, figs. 2, 26, 2c.— Cope, Proc. Amer. Phil. 

 Soc, XXII, 1885, p. 396.— BouLENGER, Cat. Liz. Brit. Mus., II, 1885, p. 223. 



Scales of moderate size, gradually increasing in size from the ventral 

 to the dorsal region, very weakly keeled, and not mucronate above, 

 entire below, except on the pectoral and gular regions, where they bear 

 an apical notch. Thirty transverse series between the inters(;apular 

 and middle sacral regions. Scales of the superior faces of the limbs 

 keeled. The large transverse supraorbital shields separated from the 



