1922] Swarth: Birds and Mammals of the Stikine Region 175 



Allen (1903, p. 550) comments upon the capture of but a single speci- 

 men of M. drummondi at Telegraph Creek, compared with an abun- 

 dance of M. mordax, as indicative of the two species having different 

 centers of abundance, but from our own experience there seems to be 

 demonstrated merely a preference for different sorts of surroundings. 

 Microtias mordax, about Telegraph Creek, was mainly caught along 

 stream sides, the kind of habitat it is known to frequent in other parts 

 of its range, and none was taken in any of the semi-aquatic runways 

 where M. drummondi was obtained. 



At Glenora the two species occurred in exactly the same places, 

 runways used commonly by both traversing the weed-grown meadows 

 about the old houses. At Doeh-da-on Creek also they were found 

 together in the bottom lands. 



We took no Drummond meadow mice at either Flood Grlaeier or 

 Great Glacier, but the capture of a single specimen at Sergief Island 

 may be taken as indicative of the occurrence of the species over the 

 entire length of the river. There are probably times when drummondi 

 is abundant at Sergief Island, but our visit there was during a period 

 of scarcity. 



Half -grown young were taken at Telegraph Creek the middle of 

 June, and a little later young not more than two-thirds the bulk of 

 adults were breeding. Embryos in gravid females ranged from four 

 to ten in number. 



Microtus mordax mordax (Merriam). Cantankerous Meadow Mouse 



Found at every collecting station except Sergief Island, but not 

 equally numerous at all places. One hundred and one specimens taken 

 (nos. 30810-30909, 31051), from the following points: The Junction, 

 12; Telegraph Creek, 16; Glenora, 38; Doeh-da-on Creek, 21; Flood 

 Glacier, 12; Great Glacier, 2. At the Junction, May 25 to June 6, 

 specimens came in slowly. There was a little meadow at that point 

 that showed signs of having been populated by meadow mice during 

 the winter months, but the animals had since moved into the nearby 

 woods. Those we obtained were taken along the streams or in wet 

 places among the trees. They were apparently rather solitary in their 

 habits and there were no well defined runways in use. At Glenora 

 meadow mice were extremely abundant. The open meadow land was 

 not frequented to any extent, but there were extensive clearings, since 

 grown up with fireweed, that were intersected in every direction with 



