570 ZOOLOGY— BATRACHIANS AiSD REPTILES. 



frontals, two frontals, and on each side posteriorly one fronto-parietal and 

 two parietals. Interparietal large, broad as long. Three longitudinal rows 

 of superior labials ; one triangular loreal. Temporals small, keeled ; two 

 very large auriculars. Two series of infralabials, the inferior ones short, 

 transverse. Fifteen femoral pores. A short deep sinus on the side of the 

 neck, descending forward. The heel extends to a little beyond the elbow, 

 and the lingers to the groin. 



Millim. 



"Total length 177 



"Length to vent - 89 



"Length to posterior border of meatus auditorius 155 



"Width of head at border of meatus auditorius 14 



"Width of head at nostrils 2£ 



"Width of frontal bone 3J 



"Length of hind limb 51§ 



"Length of hind foot 21£ 



"Length of fore limb 39 



"Length of fore foot 14 



"The ground color above is a bluish-black, which becomes more dis- 

 tinctly blue on the limbs and sides, extending in a patch over the gular 

 region and along the sides of the abdomen. The chin, middle of abdomen, 

 and tail, median line below, shade from a bluish-green in front to a yellow 

 on the last region. Each scale of the upper sm-face of the body is marked 

 by a light spot, which was some brilliant shade, probably yellow, in life. 

 Behind the interscapular region and on the tail, they are light-blue ; top 

 of head and neck bluish-black, the latter inclosed in a rectangular area, 

 boundcd-by a light band from each squamosal region. Sides of neck with 

 a broad black collar, bluish-black; the collar with a light posterior border 

 above ; the dark color extending over the shoulder, the sides of the head, 

 and the throat. 



"A light band above the upper labials, and a parallel one below the in- 

 ferior labials. 



"A very handsome species, allied to the S. torquatus, S. ornatus, &c, 

 resembling in a slight degree S. formosus, but is quite distinct, as the follow- 

 ing diagnosis will show. 



