TEIID LIZAT^DS OF THE GEXUS CXEMIDOPHORUS 15 



I'ciiuliii' transverse aiid loiii^it udiual series, the latter less than l-i in 

 iiuinber; tail rounded or sulx ylindrieal; scales on tail ditl'erent than 

 those on rest of body, forniinir' distinct rings; limbs well developed, 

 all feet with five toes; femoral pores present; anterior and posterior 

 gular folds developed; eye with lids and a round pupil: ear oixMiiuirs 

 large, tympanum exjmsed; coloration variable. 



DescHption. — Head shields large, head elongate; snout blunt or 

 moderately pointed; occi})itals snudl. uniform or irregular, usually 

 smaller posteriorly, often in regular transverse rows; parietals 

 normally 3 or 5, but sometimes abnormally divided or united; 

 fronto})arietals normally 2 or 1; frontal nornuiUy entire, seldom 

 divided; prefrontals '2; frontonasal entire, rounded or shield-shaped; 

 rostral moderately blunt; anterior nasals with a common dorsal 

 suture, in contact with first or second upper labial on each side; 

 postnasals separated above by frontonasal plate, smaller than loreal, 

 and forming a suture on each side with the anterior nasals; nostril 

 in suture between nasal plates or anterior to that suture; loreal large, 

 usually forming a suture above with onl}" the prefrontal or with the 

 prefrontal and a posterior, dorsal process of the postnasal; loreal 

 either in contact or not in ct)ntact with the first supraocular; supra- 

 oculars usually 3 or 4. but sometimes 5 or 6; supeiciliaries 3-10; 

 :-upraocuIar grarudes minute to larger, rarely extending forward past 

 the anterior border of the second supraocular, often much less; 

 frenoocular or posterior loreal present or absent ; preocular usualh^ 

 entire; suboculars usually 3. but sometimes 4 or 5; postoculars more 

 numerous, smaller, usually forming an elongate temporal ridge in a 

 longitudinal line with the superciliaries; eye with movable upper 

 and lower lids, pupil round, marginal ciliaries minute, arranged in 

 regular series, others smaller and more or less regularly arranged; 

 upper and lower labials approximately the same in number, but often 

 with an additional one or two, above or below^, usually 4 to 8 in 

 number; sublabials larger tlum labials, 3-7 larger ones on each side 

 just posterior to the mentals; anterior or terminal mental usually 

 smaller and narrower than postmental, rounded; a wedge of small 

 scutes or granules often projecting forward between the posterior 

 lower labials and the sublabials ; tympanum large, exposed, rounded 

 anteriorly. 



Gular region varied in scalation; anterior and posterior gular 

 folds present : anterior guhir scales larger than the granular pos- 

 terior gulars and sometimes abrupth^ differentiated from them; 

 anterior gulars uniform or graded, often enlarged centrally or 

 medio-laterally, or in both ways; a median dermal fold often present 

 anteriorly just behind tlie mental scute and just between the paired 

 anterior sublabial plates; mesoptychial or collar scales, between the 



