1897.] 



LIZARDS OP THE GENUS SCELOPORUS. 



513 



sides of belly pale blue, with seven to nine blackish-blue cross- 

 bars. The coloration of the female is still unknown. 



Hob. This well-marked species is only known from one locality : 

 Coliraa, in Western Mexico. 



23. SCELOPORUS CHRTSOSTICTUS. 



Sceloponis chn/sostictus. Cope, Proc. Ac. Philad. 1866, p. 125, 

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

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



Head-shields keeled or striated; frontal transversely divided, 

 the anterior portion usually longitudinally bisected ; a pair of 

 interparietals between the frontal and the interparietal ; latter 

 broader than long ; parietals very small, one or two on each side ; 

 a series of four or five large transverse supraoculars, bordered 

 inwards by a complete or incomplete series of very small scales, 

 and separated from the supraciliaries by one or two series of 

 scales ; two canthal scales, rarely one ; anterior border of ear 

 feebly denticulated. 



Dorsal scales much larger than ventrals, strongly keeled, simply 

 pointed, forming slightly oblique longitudinal lines ; 40-45 scales 

 between the interparietal shield and the base of the tail, 8-10 

 corresponding to tlie length of the shielded part of the head. 

 Lateral scales smaller than, but graduating into, the dorsals, keeled 

 and directed obliquely upwards and backwards. Ventral scales 

 small, smooth, entu-e. 36-40 scales round the middle of the 

 body. 



The adpressed hind limb reaches the anterior border of the 

 orbit or the nostril; tibia longer than the shielded part of the 

 head ; the distance between the base of the fifth toe and the 

 extremity of the fourth equals the distance between the arm and 

 the nostril or the tip of the snout, 13-16 femoral pores on each 

 side. 



Caudal scales as large as dorsals, keeled, pointed. Males with 

 enlarged postanal scales. 



Brownish or olive above, strongly metallic; a golden dorso- 

 lateral band ; a blackish spot at axilla ; hinder side of thighs with 

 a transverse and several vertical blackish bars. Lower surfaces 

 yellowish white, throat sometimes brownish. Male without dis- 

 tinctive ventral markings. 



Hah. S. chrysostictus is recorded by Cope from Tucatan and 

 Guatemala. 



