148 University of California Publications in Zoology [Vow 30 Marmota caligata caligata (Eschscholtz). Hoary Marmot A few were seen on various mountains not far from Atlin. The species is apparently of general distribution, though not numerous, above timber line (about 3500 feet) throughout the region. One speci- men (no, 34276), an adult male, was collected by Brooks near Log Cabin (White Pass), on September 1. Citellus plesius plesius (Osgood). Bennett Ground Squirrel Extremely abundant about Carcross. The grounds of the ‘‘Gopher Golf Club,’’ on the outskirts of the town, supported a large population of the squirrels, as is suggested by the club’s name, and we saw them elsewhere wherever we walked. The light sandy soil and open woods seem to form a favorable set of conditions for the species. In the immediate vicinity of Atlin I saw no ground squirrels, but there were small colonies at certain points in the lowlands within a few miles of town. Above timber line on the nearby mountains they were present everywhere, in some places in great numbers, Along Otter Creek, ground squirrels fairly swarmed, the whole length of the valley and on the surrounding mountains. Between Surprise Lake and Teslin I saw none. Just what the important factors are that determine the local distribution of the species in this region could not be ascertained with certainty, but in general the ground squirrels favored open country. The small colonies near Atlin were in open woods, and there were miles of similar woods wheré none was seen. Along Otter Creek they were numerous over ground that was densely grown with willow thickets. None was seen at any time, however, in even fairly dense woods of large conifers. On August 24 ground squirrels were abundant and active on the summit of Monarch Mountain. On September 5, at the same place, none was seen. As this was a cold, stormy day, however, their dis- appearance may have been but temporary and due to the weather at that time. Five specimens were preserved (nos. 34399-34403), one from Car- cross, May 22, two from Spruce Mountain, July 31 and August 3, respectively, and two from Monarch Mountain, August 24.