128 University of California Publications in Zoology, ['^ol. 7 



and longer tail. The single specimen from Bradfield Canal has 

 a noticeably more slender and elongated skull, with much lighter 

 teeth. 



We found red-backed mice at but three mainland points, and 

 on none of the islands. At Boca de Quadra four were secured 

 (nos. 8741-8744). These were caught in a thin line of spruce 

 trees extending into one of the damp meadows, the scanty under- 

 growth below the trees showing here and there traces of faintly 

 defined runways. The mice evidently were not abundant, as 

 several nights trapping produced but the four specimens, and 

 lines of traps in other similar places brought in nothing at all. 

 On the Chickamin River they were rather more common, and 

 during our stay there I secured fifteen (nos. 8745-8759). These 

 also were all caught in scattered clumps of trees in the meadow 

 land ; there was little or no indication of runways, or other such 

 evidence as is always to be found where meadow-mice (Microtus) 

 are living. The only other place where the species was met with 

 was at Bradfield Canal, where a single specimen, an adult female, 

 was caught on July 24 (no. 8760). 



Microtus drummondi (Audubon and Bachman). 

 Drummond Meadow-mouse. 

 This is a species belonging more peculiarly to the interior 

 valleys east of the mountains, and it finds its way to the coast 

 at apparently but very few points. We met with it only on the 

 Taku River, a stream whiich forms a direct pass into the interior, 

 and where other mammals, and birds also, were found, which 

 properly belong to the fauna of the interior rather than to that 

 of the coastal region. Bordering the river are miles of meadow 

 land, and here these mice live in great numbers; in fact in no 

 other place did we find any species of Microtus so abundant. 

 Narrow, well-defined runways intersected the meadows in all 

 directions, centering in little clumps of brush, or where a log or 

 fallen tree gave shelter to the entrances of the burrows. They 

 evidently avoided the comparatively dry woods near by, where 

 none were caught, nor were any runways seen there, though at 

 times the meadow land was flooded almost everywhere, and the 

 runways resembled little creeks through the grass. 



