The following pages contain an account of the Mammals obtained during my journey 

 in Siarn and the Siamese Laos States 1914 — 1915. 



The whole journey lasted about 14 months, a considerable amount of which was 

 spent in Northern Siarn. With the exception of the collections presented to the British 

 Museum of Natural History by Mr. T. H. Lyle very few specimens from Northern Siarn 

 have ever reached European Museums. Quite recently, however, the collectors of the 

 Bombay Natural History Society's Mammal Survey have sent magnificent collections 

 from some of the neighbouring countries such as Burma and Tenasserim and many no- 

 velties or rare species have been met with and recorded. 



In my memoir on the Birds collected by the Expedition (Kungl. Svenska Veten- 

 skapsakademiens Handlingar Band 56. No. 2, 1916) I have already given a short account 

 of my journey and it therefore seems quite unnecessary to repeat it in this connection. 

 The names of the places visited are to be found in that paper and the whole course of 

 the journey may be traced on the map. 



As the greatest time was spent in pursuit of birds, the mammal collection is not 

 very large, but still it comprises 176 specimens. Together with the species observed it 

 makes a total of 79 species. Among these a few have turned out to be new to science and 

 have been described either as new species or as new geographical races of hitherto known 

 forms. 



In the following systematical list three species obtained during my former journey 

 to Siarn 1911 — 1912 have been included, though already dealt with in my former paper 

 on the Mammals of Siarn (Arkiv för Zoologi, Band 8. No. 23., 1914 p. 1 — 36). Since 

 more material has now been available these species have either turned out to belong to 

 hitherto undescribed forms or have been recently split up into new forms by other authors. 



In the systematic list the following species and subspecies have been described 

 for the first time: 



Rhinolophus macrotis siamensis, subsp. n. 



Tupaia siamensis, sp. n. 



Paradoxurus hermaphroditus laotiun, subsp. n. 



Sciurus helgei, sp. n. 



Sciurus bocourti grutii, subsp. n. 



Menetes berdmorei koratensis, subsp. n. 



Rattns sakeratensis, sp. n. 



Cannomys minor lönnbergi, subsp. n. 



