CKOCODILIANS, LIZARDS, AND SNAKES. 



535 



BARISSIA LEVICOLLIS Stejneger. 

 Ihtrrisfiia levkoUis SriciNKciEK, Proc. U. S. Nat. Mus., XIII, 18110, p. 184. 



The following is Dr. Stejneger's descrii^tiou of this sijecies: 



No azygos prefrout;il; three pairs of shields between the frontal and the rostral; 

 prefrontals not in contact with loreal; no projecting scales above the ear; one large 

 upper postorbital and two minute lower ones ; forty-six transverse vows of dorsal 

 scales between the head and the base of the tail, and sixteen longitudinal rows ; head 

 shields swollen. Head narrow, snout long, pointed ; head shields swollen ; two pairs 

 of internasals, the posterior in contact with anterior supraocular; one pair of pre- 

 frontals; nasal separated from rostral; a supranasal; a postnasal; a loreal, pentago- 

 nal, not higher than wide, and separated from prefrontals ; a preorbital ; two 

 suborl)ital8, the posterior very long ; one very large upper postorbital and two minute 

 lower ones; ten and twelve supralabials; sides of neck covered with granular 

 scales; lateral fold, commencing below the ear opening; nuchal scales not keeled, 

 in ten longitudinal rows; dorsal scales of medium size, in sixteen longitudinal rows, 



Fig. 96. 



Barrissia levicollis Stejneger. 



=1. 



Cat. No. 0G3'2, U.S.N. M. 



the four median obtusely keeled, the next two on each side with the keels still less 

 pr;mounced and the remainder smooth; forty-six transverse dorsal rows; ventrals 

 smaller than dorsals, in twelve longitudinal rows; [tail reproduced]. 



Color (in alcohol) above uniform " tawny-olive" with interrupted transverse bands 

 of black dots on tlie sides, the scales with the dots being margined posteriorly, more 

 or less distinctly, with whitish ; under side dull pale clay-color, with irregular black 

 dots on flanks and throat. 



Measurements. — From snout to vent, 121 mm.; from snout to ear 

 opening, 27 mm.; from snout to fore limb, 38 mm.; from axilla to groin, 

 67 mm. ; greatest width of head, 18 mm. ; fore limb, 27 mm. ; hind limb, 

 ■^4 mm. 



Unfortunately, the exact locality where the type of this species was 

 collected is not known; all that the record book contains is "Mexican 

 Boundary." It was evidently obtained by one of the surveying parties 

 of the United States and Mexican Boundary, but the original number 



