204 DR. MALCOLM SMITH ON 



them at night with a lamp, when their shrill cries reveal their pre- 

 sence among the foliage in which they live, and they can be easily 

 tracked down and caught. 



I have also included in the paper certain changes in nomen- 

 clature which I believe to be correct. These conclusions have been 

 reached only after the study of a considerable amount of material, in 

 most cases of living specimens as well as of preserved ones. 



Testudo impressa Giinther. 



Geoemyda impressa, Giinther, P. Z. S. 1882, p. 343, figs. 1-3. 

 Testudo emys, Boulenger, Ann. Mus. Civ. Genova, 1893, (2) xiii, 



p. 312. 

 Geoemyda latinuchalis, Vaillant, Bull. Soc. Philom. Paris, 1894; 



(8) vi., p. 68 ; id., Mocquarcl, Rev.' Colon., Kept. Indo- chine, 



1907, p. 10. 

 Testudo pseudemys, Bouleng., Fascic. Malay., Zoo!., 1903, i. p. 144. 



pi. ix, and text fig. 1. (skull) ; Annandale, Journ. Proc. Asint, 



Soc. Bengal, 1906, (2) ii. p. 204. 

 Testudo latinuchalis, Siebenr. Zool. Jahrb., Suppl. 1909, x, p. 520; 



Bouleng., Fauna Malay Penin., Kept. 1912, p. 15. 



Testudo impressa was described by Giinther from a single 

 shell received from Siam. It was subsequently referred by Boulenger 

 to Testudo emys Schleg. & Mull., and of late appears to have been 

 forgotten. 



While working with Mr. Boulenger in the British Museum 

 prior to his retirement, we took the opportunity of examining this 

 shell, and of comparing it with a series of tortoises that I had col- 

 lected in Siam. There was no doubt whatever that it was not 

 T. emys at all, but was identical with the species now recognized 

 as Testudo latinuchalis (Vaillant). 



Boulenger's separation of T. emys from T, latinuchalis (Faun. 

 Malay Penin., p. 14) on the relative proportions of the vertebral shields 

 is not a sufficient one, owing to the variations in size which are 

 found in different individuals. In several other characters, how- 

 ever, the two are so distinct that there can be no doubt as to their 

 specific identities. 



Confirmation is also to be found in the cranial characters, 

 the skull of one of my specimens of T. latinucludis differing from 



JOURN. NAT. HIST. SOC. SIAM. 



