SINO-MONGOLIAN FRONTIER 
The biological work of the year ending in 
August, 1912, as might be expected, was very 
much hampered by the unsettled state of the 
country. From October 27, 1911, to May 10, 1912, 
more than half the year, not a single specimen was 
added to my collection, except three antelope 
skulls, which I purchased in the Tientsin game 
market. Subsequently we tried to make up for 
lost time, making collections during the summer 
in North Shansi and on the Mongolian Plateau. 
Altogether from October, 1909, to August, 1912, 
about two hundred and seventy specimens of 
mammals were collected, including forty-five species 
and subspecies. 
Very little was done in the way of collecting 
birds or cold-blooded vertebrates, while inverte- 
brates were left entirely alone. It was unfor- 
tunate that I could not do more in these branches 
of zoology, but reptiles and amphibeans were 
almost non-existent in most of the localities 
visited. It was only in Mongolia that insects 
were at all plentiful, and while travelling in that 
country I had my time occupied with other 
important work. 
Following is a list of the different species and 
subspecies of mammals obtained on the various 
expeditions subsequent to the Clark Expedition. 
For the sake of the general reader I have given 
popular names of my own to distinguish the 
different forms. 
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