62 BARBOUR — XIPHOCERCUS Tv^ilv^lf' 



gests that such may have been the case, for there are no whorls, 

 no enlarged scales to retard curving or coiling. The tail of the 

 Jamaican lizard is very strongly compressed, curves laterally, 

 is fragile, and, as would be expected of a very fragile tail, it is 

 sharply segmented in scalation. It is not capable of use in Ufe, 

 although I seem distinctly to remember its being often carried 

 rather sharply curled, laterally, after the manner of many 

 Anoles, notably Anolis homolechis of Cuba. 



There is good reason, therefore, for estabHshing the type from 

 the Bogota region as a distinct genus, and I propose for it a 

 name which suggests that it has sailed under false colors. 



PHENACOSAURUS gen. nov. 



Type, Anolis heterodervms A. Dum^ril. 



Tympanum distinct. Body compressed, covered with enlarged, slightly 

 imbricating scales, each surrounded by smaller granules. A feebly de- 

 veloped biserial dorso-nuchal crest. Head with large plate-like scales, the 

 peripheral series enlarged and forming a slightly elevated rim. Male with 

 a feebly developed folding dewlap. Digits widely and evenly dilated, their 

 sides parallel, with many smooth transverse lamellae below; the distal 

 phalanx only, slender and compressed. No femoral or preanal pores. Tail 

 one and one-fourth times as long as head and body, very slightly com- 

 pressed, and apparently prehensile. Lateral teeth tricuspid; pterygoid 

 teeth absent. No sternal fontanelle. Abdominal ribs. 



Now, therefore, since Boulenger's diagnosis of the genus 

 Xiphocercus was drawn up to include these two unrelated types, 

 it would best be revised to include the unique Jamaican species 

 only. 



XIPHOCERCUS Fitzinger 



Type, Anolis valendennesi Dum^ril & Bibron. 



Tympanum distinct. Body compressed, covered with small, flat, sub- 

 equal, plate-like, rounded or polygonal scales, usually not in contact with 

 each other. No dorsal or nuchal crest. Head with large plate-like scales, 



