512 



MB, a. A. BOTJIiENGER OK THE 



[May 18, 



lines, the first of which crosses the frontal and supraocular 

 regions. Male with a black bar (sometimes interrupted) across 

 the throat, and with a large pale blue blotch on each side of the 

 bellv, broadly edged with blackish blue on the median ventral line. 

 Bah. The specimens were collected at various localities in the 

 State of Jalisco, at altitudes varying between 7800 and 8500 feet. 



22. SCELOPOErS pterhocephaltjs. 



Sceloportts pyrrJiocephcihis^, Cope, Proc. Ac. Philad. 1864, p. 177, 

 and Proc. Am. Philos. Soc. sxii. 1885, p. 394 ; Bouleng. Cat. Liz. 

 ii. p. 235 (1885) ; Giinth. Biol. C.-Am., Eept. p. 70 (1890). 



Head-shields smooth ; frontal transversely divided, in contact 

 with the interparietal, \vluch is a little broader than long ; parietals 

 small, one pair on each side ; one or two canthal scales ; five large 

 transverse supraocidars, bordered inwards by one series of scales, 

 and separated from the supraciliaries by another ; five scales, not 

 larger than, those before them, form a denticuJation on the anterior 

 border of the ear. 



Dorsal scales much larger than ventrals, strongly keeled, mu- 

 cronate and more or less distinctly denticulate, forming oblique 

 series converging towards the median line ; 40-43 scales between 

 the interparietal shield and the base of the tail ; 8 scales, taken in 

 the middle of the back, coiTespond to the length of the head. 

 Ventral scales small, smooth, bicuspid. 46-50 scales round the 

 middle of the body. 



The adpressed hind limb reaches the shoulder or the ear ; tibia 

 as long as the distance between the end of the snout and the ear ; 

 the distance between the base of the fifth toe and the extremity of 

 the fourth exceeds the distance between the end of the snout and 

 the posterior border of the ear. 12-15 femoral pores on each 

 side. 



Tail distinctly compressed. Caudal scales as large as dorsals, 

 strongly keeled and mucronate. Males without enlarged postanal 

 scales. 



The two specimens in the British Museum show the following 

 measurements and numbers of scales : — 



Bronze-coloured above, reddish towards the sides ; a broad, 

 black, light-edged stripe along each side ; a black vertical bar in 

 front of the shoulder ; head reddish brow^n ; lips Avith dark vertical 

 bars ; an elongate black spot with yellow centre (pineal eye) in 

 the middle of the interparietal shield ; throat with oblique bluish 

 bands, converging posteriorly ; breast and middle of belly yellowish ; 



' Originally^ misspelt " pyrocephalus." 



