CROCODILIANS, LIZARDS, AND SNAKES. (129 



Liud ley troui kuee, three and one-half times. F'ifth hind toe about c(|nal to 

 second ; free part of longest nearly three-fourths inch on the side of head. 

 Scales in 26 rows. Young, olive above, with two white lines on each side, 

 embracing a black band. The upper are each on adjacent edges of two rows 

 of scales, margined internally by black, and separated by two plain 'olive 

 rows. Under parts white. No trace of dorsal white line, nor on thij:h 

 behind. Ground color sometimes all black. With age the stripes disappear to 

 a great extent E. tilcUtonianun Baird and Girard. 



Head short, ap])ressed limbs meeting on side. Hind legs applied twice forward, 

 reach midway from arm to ear; contained three times in head and body; hind 

 leg from knee, four times; head, four and one half times. Fifth hind toe 

 shorter than second; the free jjortion of longest two-fifths the side of head. 

 Distance between centers of insertion of fore and hind legs nearly twice 

 that fjom center of lore leg to snout. Scales in 26 rows. luternasal equal 

 Ijrefrontal. Young dark olive, black above, black on the sides, blue beneath 

 and on the tail. Five very narrow whitish dotted lines, the two lateral on 

 the centers of single rows of scales; the two dorsal margined narrowly by 

 almost inappreciable black, and their rows separated by four, all lighter in 

 the centers, Becoming lighter olive with age E. leptogravtrnus Baird. 



Appressed limbs separated by a space less than length of fore foot. Internasal 

 plate smaller than jjrefrontals; rostral elevated. Scales in 24 rows. Three 

 dark bands on each side of the middle line; no lateral light bands; size 



medium E. epipleHrotus Cope. 



B. Postnasal small, more or less separated from contact with the supranasal by the 

 prefrontal. 



Head short, conical, contained at least five times in head and body, as is the 

 hind leg from knee also. Hind leg short; when apjjlied twice forward falling 

 behind the fore legs. Fifth toe shorter than second. Vertical and frontal 

 plates often in contact. Distance between centers of insertion of fore and 

 hind legs twice that from center of fore leg to snout. Scales in 24 rows. Light 

 olive; paler beneath. A broad median dorsal light band, bordered on each 

 side by five dark and four light stripes; the first and fourth dark stripes 

 broadest; the second light stripe in the middle of the third row of scales, and 

 bordering the head, but defining no spots ou sides of labials. Sometimes 

 Muicolor E. multiviroatus Hallowell. 



Division HI. 



A. Three supraorbital plates; internasal in contact with loreals. 



Posterior edge of jiostnasal before that of second labial. Scales of body in 

 about 22 rows. Ear openings very small. Reddish ash or gray, with two white 

 lines on each side margined with dusky, and traces of a third; all on the cen- 

 ters of single rows. Upper lateral lines separated by two plain rows. Beneath 

 reddish white E. egregins Baird. 



B. Four supraorbital plates; loreal not separating the supranasals and prefrontals, 



which met^t and inclose the small internasal. 

 Scales in 28 rows; olive above, with lour eciuidistiint and equal dark stripes on 

 adjacent half rows of scales, the two inner sometimes efi'aced. Sides with two 

 narrow white lines, on the centers of single rows of scales embracing a black- 

 stripe, and margined above and below by black ; the black uj)per margin one of 

 X\\K dorsal stripes mentioned ; lh(! interval of the two upper lateral stripes six 

 rows of scales; lower lateral stripe ])assiug along upper edge of ear. Beneath 

 light greenish E. sepientrionalin Baird. 



