Ilhe following 22 species of lizards have been collected by Count Nils Gylden- 

 . stolpe during his two expeditions to Siarn 1911 — 1912 and 1914 — 1915. Most of 

 them have been known to belong to the herpetological fauna of Siarn before, but 

 there are also sorae novelties viz. a new species of Acanthosaura, and a highly inter- 

 esting new Scincoid genus which has been named Isopachys. 



With regard to the natural conditions of the localities in which the animals 

 have been collected I refer to the Communications made on this topic by Gylden- 

 stolpe in his paper on the snakes from the same expedition. 



Four localities for lizards have, however, not been mentioned there, and con- 

 cerning them Gyldenstolpe has communicated the following: »Pak Koh situated 

 in a latitude of about 18° N., mostly dry or mixed forests. Bång Hue Pong on the 

 slopes of Koon Tan mountains, Northern Siarn, almost the same vegetation. Den Chai 

 in Northern Siarn, but further south than the two places mentioned, dry forests. 

 Keng Loi [= rapids] at the middle course of Meping river, low bush, thick jungles 

 mixed with bamboos and some big trees, high grass in open places. > 



1. Phyllodactylus siamensis Blgr. 



2 specimens (M. Smith coll.). 



This interesting Gecko, the first member of the genus found in the Indian 

 region does not appear to extend its distribution to Malacca, but to be confined to 

 the interiör and northern parts of the country. This indicates that it is endemic, 

 and not accidentally introduced, although the distribution of the genus generally 

 might make such a supposition possible. 



2. Hemidactylus frenatus (Schleg.) Dum. & Bibe. 



1 specimen, Siarn, 1912. 2 specimens, Siamese Malacca, Koh Lak, Nov. 1914. 

 Common in the houses, 



