16. PHTLLODACTYLirs. 77 



Synopsis of the Species. 

 I. Back with unequal lepidosis. 



A. Skin of crown free from cranial ossification, 



1. Dorsal tubercles keeled. 



a. Digital expansion much wider than the rest of the 

 digit, trapezoid. 



Dorsal tubercles in 14 more or less ir- 

 regular longitudinal series; ventral 

 scales in 25 to 30 longitudinal and 

 65 transverse series 1. tub ercuhsus, p. 79. 



Dorsal tubercles in 14 longitudinal series ; 

 ventral scales in 18 to 20 longitudinal, 

 and 45 to 50 transverse series 2. ventralis, p. 80. 



Hinder part of head with uniform minute 



grauular scales 3. reissii, p. 80. 



Dorsal tubercles in 20 to 22 longitudinal 

 series; ventral scales in 22 longitu- 

 dinal and 53 transverse series 4. pulcher, p. 80. 



Dorsal tubercles in 20 longitudinal series ; 

 ventral scales in about 25 longitudinal 

 series ; labials f 5. spatulatus, p. 81. 



6. Digital expansion not much wider than the rest of 

 the digit, rounded. 



Dorsal tubercles small, in 12 longitudinal 



series 6. galapagoensis, p. 82. 



Dorsal tubercles large, in 16 longitudinal 

 series ; digits slender, the digital ex- 

 pansions very small 10. phacophorus, p. 84. 



2. Dorsal tubercles not keeled. 



a. Digital expansion well developed. 



Dorsal tubercles very distinct from the 



granular scales ; mental very large . . 7. nigrofasciatws, p. 82. 



Dorsal scales of unequal sizes, the 

 tubercles differing only in size from the 

 other dorsal scales 8. imequalis, p. 83. 



Dorsal tubercles very distinct from the 

 granular scales; two elongate chin- 

 shields ; head large; hmbs long .... 11. oviceps, p. 85. 



h. Digital expansion very small. 

 Dorsal tubercles a little smaller than the 



ventral scales 9. miorophyllus, p. 84. 



B. Skin of head confluent with cranial ossification. 

 Infradigital lamelte divided medially . . 12. sancti-johannis , p. 86. 

 Infradigital lamellae entire 13. stumpffi, p. 86. 



