238 ZOOLOGISCHE MEDEDEELINGEN — DEEL V. 



and in the southern part of Atjeh, that are at my disposal are a proof 

 of it. Lepidodactylus ceylonensis, only known from Engano, Java, 

 Borneo, the Malay Peninsula, Burma and Ceylon, was captured by Mr. 

 Jacobson in the Padang Highlands near Fort de Koek, and cannot be 

 used any longer as a proof for the supposition of a Java-continent con- 

 nection without Sumatra. Another case is found in Lygosoma vittigerum, 

 formerly thought autochtone for Sipora, but afterwards found near Kuala 

 Teku and Ginting Biclai in the Malay Peninsula and in Sarawak in 

 Borneo. It is possible that this species lives in Sumatra also. Both cases 

 show that the fauna of the larger Indian islands is not yet totally known. 



Returning to our question of the regional distribution of the in- 

 habitants to the islands, I can finally name a snake: Dendrophis pictus 

 var. striata. This form from Asahan in Deli was present in collections 

 originating from Deli and Serdang, but also from Djambi and Nias. Not- 

 withstanding its occurrence in places so far away from each other, this 

 variety is very rare; from each place I got only one specimen. It is 

 again a contradiction of the hypothesis, for Djambi and Nias lie far 

 away from each other. 



With regard to the reptiles I suppose that the separated islands 

 formerly were united and with Sumatra too by means of a broad bridge 

 towards the present districts Tapanuli and Padang. The Batu Islands 

 were separated from Sumatra at a later time than the other parts; their 

 reptile-fauna includes : Varanus dumerili, Geoemyda spengleri, G. spinosa 

 and Dipsadomorphus dendrojjhilus^ all thorough sumatran forms. 



Amsterdam, Oct. 1920. 





