1884.1 ^**^ [Cope. 



First row of scales smooth or nearly so ; tail shorter, urosteges, 68-74 ; 



no dorsal stripe nor occipital spots E. insifjniarum. 



First row of scales smooth ; tail shorter, urosteges 71 ; a dorsal stripe and 



occipital spots E. flavilabris. 



First row of scales keeled ; tail longer, one fourth of total, urosteges, 84 ; a 



dorsal stripe and occipital spots E. megalops.* 



EUT^NIA CHRTSOCEPHALA, Sp. nOV. 



The discrimination of this species will be facilitated by comparing it 

 with other species of the genus, which occur in Mexico and Central 

 America, in which the lateral stripe is on the second and third rows of 

 scales. 



I. Scales in seventeen rows. 



Inferior row4ieeled ; urosteges, 81 ; no dorsal stripe ; a large black nuchal 

 spot ; head yellow E. chrysocephala. 



II. Scales in nineteen rows. 



Lower row of scales keeled ; urosteges, 91 ; a dorsal stripe ; lateral stripe 

 not denned below ; gastrosteges not black at the base ; a large nuchal 



spot ; head brown E. collaris Jan. 



Lower row of scales smooth ; urosteges, G7 ; a dorsal stripe ; lateral stripe 

 boi-dered below by a brown stripe ; a black nuchal spot ; head 



brown E. pulchrilatus. 



Urosteges, 60-65 ; no stripes, but four rows of small spots which do not 

 touch each other, but become larger on the neck ; a large oblique 

 black band on each side the nape ; head brown ; keels very strong. . . 



E. sumichrasti. 

 The Eutmnia cyriopsis of Kennicott belongs to this group, and comes 

 nearest to the E. collaris Jan. In fact, the second variety of the E. cyr- 

 topsis, described by Kennicott (Proc. Acad. Philada., 1860, p. 334), is the 

 E. collaris Jan. The latter is a common species in Mexico. I have it from 

 Guanajuato, Duges, Orizaba, Sumichrast : from the valley of Toluca, Vas- 

 quez, and from Guatemala from Dr. Van Patten. I do not find the gastros- 

 tega to exceed 153 in number, while Kennicott gives 179 as the number in 

 his types from Coahuila. I therefore keep the species apart, although I 

 shall endeavor to verify the number given by Kennicott on his types. 



The E. chrysocephala has a slender body, and a wide, flat head, with a 

 large eye. The size of the latter contracts the frontal plate, so that it is 

 not wider than the superciliaries posteriorly. The scuta are otherwise as 

 usual. Superior labials eight, none higher than long, fourth and fifth be- 

 low orbit. The inferior surfaces are darker than in E. collaris, which 

 causes a better definition of the lateral line than in that species. There 

 are representations of two rows of lateral black spots, but they are merely 



* EiUaenia megalops Keiin. Proceeds. Acad. Phila., I860, p. 330, My specimen 

 Is from Duck creek, a tributary of the Gila. Gastrosteges 164 ; total length, M. 

 ,610; tail, .lis. Color above brown, a few scales black-edged near the stripes. A. 

 postoral crescent, black-edged behind. 



