Griffin: The Saurian Genus Prionodactylus. 429 



Nineteen ventral series, thirty-nine scales around the middle of the 

 body, twenty-six scales from occiput to base of tail, one anterior 

 and three posterior pre-anal scales. .P. kocki Lidth de Jeude, 1904. 



3. Ventrals in eight longitudinal rows. 



Nineteen ventral series, twentj--six scales around the middle of the body, 

 twenty-nine scales from occiput to base of tail, four pre-anal scales in 

 the form of a cross P. leticoslicliis Boulenger, 1900. 



Eighteen ventral series, thirty-three scales around the middle of the body, 

 thirty-two scales from occiput to base of tail, two anterior and four 

 posterior pre-anal scales P. holivianus Werner, 1899. 



4. Ventrals in twelve longitudinal rows. 



Nineteen to twenty-one ventral series, thirty-eight to forty-five scales 

 around the middle of the body, thirty-nine to forty-six scales from occi- 

 put to base of tail, two anterior and four to six posterior pre-anal scales. 



P. spinalis Boulenger, 191 1. 

 II. Nostril pierced in the suture between two plates, scales of outer and middle 

 rows of ventral scales smaller than the others. 



1. Ventrals in six longitudinal roW'S. 



Twenty ventral series, thirty-seven scales around the middle of the body, 

 thirty scales from occiput to base of tail. 



P. vertebralis (O'Shaughnessy) 1879. 



Twenty' ventral series, fifty scales around the middle of the body, thirty- 

 one scales from occiput to base of tail P. palmeri Boulenger, 1908. 



2. Ventrals in eight longitudinal rows. 



Eighteen to twenty ventral series, thirty-six to thirty-eight scales around 

 the middle of the body, thirty-five to thirty-eight scales from occiput 

 to base of tail, three or four pre-anal scales in a single row. 



P. ockendeni Boulenger, 1907. 

 8. Ventrals in ten longitudinal rows. 



Twenty-seven ventral series, thirty-seven scales around the middle of the 

 body P. ocellifer Werner, 1901. 



Bibliography of Original Descriptions 

 Bottger, O., Ber. Senck. Ges., 1876, p. 141. 

 Boulenger, G. A., Cat. Lizards, II, 1885, p. 392, PI. XXI, fig. i. 

 Boulenger, G. A., Trans. Linn. Soc. Lond., (2), VIII, 1900, p. 54, PI. 5, figs. 2-2c. 

 Boulenger, G. A., Ann. Mag. Nat. Hist., (7) XIX, 1907, pp. 486-487. 

 Boulenger, G. A., Ann. Mag. Nat. Hist., (8) II, 1908, pp. 518-519, fig. 3. 

 Boulenger, G. A., Ann. Mag. Nat. Hist., (8) VII, 1911, pp. 23-24. 

 Griffin, L. E., Annals Carnegie Museum, XI, 1917, pp. 314-317, Pis. XXXIV-V. 

 Lidth de Jeude, Th. W. van. Notes Leyden Museum, XXV, 1904, pp. 91-92, PI. 



7, figs. 3. 4- 

 O'Shaughnessy, A. W. E., Ann. Mag. Nat. Hist., (5) IV, 1879, p. 298. 

 O'Shaughnessy, A. W. E., Proc. Z06I. Soc, London, 1881, p. 231, PI. XXII, fig. 3. 

 Peters, W., Abh. Kon. Ak. Wiss. Berlin, 1862, p. 184, PI. I, fig. 3. 

 Werner, F., Zool. Anz., XXII, 1899, p. 481. 

 Werner, P., \'erh. Ges. Wien, LI, 1901, pp. 596-597. 

 Werner, P., Mitt. Mus. Hamburg, XXVII, 1910, pp. 31-32. 



