1897.1 LIZABDS OF THE GENUS SCELOPORTJS. 509 



merging into dorsals and ventrals. Ventral scales smooth, mostly 

 entire. 46-50 scales round the middle of the body. 



The adpressed hind limb reaches the ear ; tibia as long as the 

 shielded part of the head ; the distance between the base o£ the 

 fifth toe and the extremity of the fourth slightly exceeds the 

 distance between the end of the snout and the posterior border of 

 the ear. 13-16 femoral pores on each side. 



Caudal scales much larger than dorsals, strongly keeled. Males 

 with enlarged postanal scales. 



Olive above, with transverse black spots ; a narrow black sca- 

 pular collar, interrupted in the middle. Male with a blue, black- 

 edged patch on each side of the belly. 



A small species, the largest specimen on record measuring 66 

 millim. from snout to vent. I have examined only two half-grown 

 specimens from Guatemala. 



Hah. The few specimens known come from Mexico (Oaxaca, 

 Mirador, Tehuantepec) and Gruatemala. 



20. SCELOPOETJS MIOEOLEPIDOTTTS. 



Scehporus c/rammicus, var, a, Wiegm. Isis, 1828, p. 370. 



Scelo]iorus microlejndotus, Wiegm.. Herp. Mex. p. 51 (1834); 

 Bocourt, Miss. Sc. Mex., Eept. p. 194, pi. xviii. bis, fig. 13 (1874) ; 

 Cope, Proc. Amer. Philos. 8oc. xxii. 1885, p. 395 ; Bouleng. Cat. 

 Liz. ii. p. 232 (1885) ; Duges, Naturaleza, (2) i. 1888, p. 112, pi. 

 xi. fig. 5 ; Giinth. Biol. C.-Am., Eept. p. 72 (1890). 



Tropidolepis wAcrolepidotus, Dum. & Bibr. Erp. Gen. iv. p. 308 

 (1837) ; Gray, Cat. Liz. p. 209 (1845). 



Sceloporus dispar, Baird & Gir. Proc. Ac. Philad. 1852, p. 127. 



Sceloporus ruhriventris, Giinth. 1. c. pi. xxxii. fig. C.^ 



Head-shields smooth or sUgbtly rugose ; frontal transversely 

 divided, in contact with the interparietal or separated from it by a 

 small azygous shield ; interparietal as long as broad or a little 

 broader than long ; parietals small or broken up into scales ; one 

 or two series of transversely enlarged supraoculars, bordered 

 inwards by one series of scales and separated from the supraciliaries 

 by two to four series ; two canthal scales ; anterior border of ear 

 with a denticulation of slightly enlarged pointed scales. 



Dorsal scales not or but slightly larger than ventrals, strongly 

 keeled, not or but slightly mucronate, forming oblique longitudinal 

 series converging towards the median line ; 60-83 scales between 

 the interparietal shield and the base of the tail, 12-20 corre- 

 sponding to the length of the shielded part of the head. Lateral 

 scales keeJed, directed upwards and backwards. Ventral scales 

 smooth, entire or bicuspid. 62-78 scales round the middle of the 

 body. 



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



^ Founded partly on the erroneous assumption that both sexes are coloured 

 alike. The two specimens described are females. The number of scales in a 

 series along the middle of the back Taries much more than between 62 and 68 

 in the specimens referred by Giinther to S. microlepidotus. 



Peoc. Zool. Soc— 1897, No. XXXIV, 34 



