500 PROCEEDINGS OF THE ACADEMY OF 



bb. Occipito-nuchal scales smaller than those on the muzzle ; palpebral spine 



distinct, 

 c. Gular scales keeled. 



S. macrolepis, Gunther. 



Muzzle short, rostral and supranasal plates moderate, the latter not in con- 

 tact. Head scales all keeled; interaxillary dorsal scales in twenty rows. Labial 



plates 7 ; symphyseal narrowed posteriorly. fc Above brown, many of the 

 scales tipped with darker; sometimes a few black spots on the median line. 

 An irregular median rostral streak, which subdivides anterior to the orbits ; 

 the resulting two diverge on the occiput and unite on the nape, enclosing an 

 elongate black subgemmiform spot. The modifications of this pattern are 

 various. A postocular streak extending nearly to the shoulder, and an infe- 

 rior line exetnding to the auricular opening. Chin verniiculated with black ; 

 tail speckled above and below. 9 Four longitudinal lines broken into spots ; 

 an interscapular spot with two white in it; a black nuchal spot, connected or 

 not with a longitudinal line, on each side, which unite or not on the muzzle, 

 and which are in contact or not with a round median occipital spot. Chin not 

 spotted. Both sexes whitish beneath. 



Hab. Island St. Thomas. Mus. Philadelphia, "Washington. 



cc. Gular scales smooth. 

 S. n o t a tu s, Baird. 



Muzzle rather short ; supranasal plates not in contact ; symphyseal broad 

 4 

 posteriorly. Labials -g ; frontal scales keeled, dorsal interaxillary in from 



seventeen to twenty-two row3. Tail longer than body. Color reddish brown, 

 with faint darker markings on the back, indicating longitudinal streaks. A 

 median longitudinal line upon the head, which expands posteriorly ; a super- 

 ciliary, three postocular and a loreal line ; the first mentioned extend for a 

 greater or less distance posteriorly ; in some specimens (among them the types) 

 these lines are broken into small spots. 



Hab. Key West, Florida; New Providence I., Bahamas ; Cuba. Mus. Phila- 

 delphia, "Washington, Salem, Mass. 



S. g i 1 v i t o r q u e s, Cope. 



Muzzle short; supranasal plates not in contact; symphyseal narrow behind. 

 3 

 Labials -s ; frontal scales keeled ; dorsal interaxillary in about sixteen rows. 



Color dark brown above, with a yellow collar just anterior to the interscapular 

 region. Head darker, marked with narrow lines as follow ; one median, one 

 supeixiliary, one loreal, two postauricular : beneath a little paler. 

 Hab. Jamaica. Mus. Philadelphia. 



**Lateral dorsal scales larger than the median, keeled. 

 S. fantastic us, Cuv. 



3 



Muzzle short ; labials g ; rostral bordered posteriorly by four scales ; nasal 



plate lateral; symphyseal rhombic. Color yellowish, the head black, vermicu- 

 lated with white lines. 

 Hab. Martinique. 



S. anthracinus, Cope. 



Size large, (head and body 1 inch 9 lines;) muzzle elongate acute ; labials 

 four above, two large and three small below ; supranasal plates small, supe- 

 rior ; frontal scales keeled ; the dorsal strongly keeled, rounded, in ten rows 

 on each side, extending for a considerable distance on the tail. Gular scales 

 smooth. Color black, the large dorsal scales tinged with blue. 



Hab. Mexico. Mus. Philadelphia. 



[Dec. 



