80 NORTH AMERICAN FAUNA. [No. 16. 
believe that the Sierra marmot is really the only mammal common to 
the Sierra and the Cascades which does not occur on Shasta. 
Two boreal birds believed to be common to the Sierra-Cascade 
system (the western winter wren, Anorthura hiemalis pacifica, and the 
Townsend warbler, Dendroica townsend) have not yet been discovered 
on Shasta, but are liable to be found there at any time. 
With plants the case is quite different, for at 1east 19 well-known 
genera, and a considerable number of species of other genera, 10t 
known from Shasta are common to the Sierra and the Cascades. 
(a) MAMMALS. 
Arctomys tlaviventer. Gulo luseus, Lasionycteris noctivagans. 
()) BIRDS. 
Anorthura hiemalis pacitica. Dendroica townsendi. 
(©) PLANTS. 
Genera not known from Shasta, 
Arenaria. Tris. Ranunculus. 
Cassiope. Ivesia. Smelowskia. 
Claytonia. Listera. Streptopus. 
Clintonia. Mertensia. Thalictrunm. 
Erythroninm. Pedicularis. Xerophyllum. 
Geum. Primula. 
Heuchera. Raillardella. 
Additional species not known from Shasta, 
Arnica chamissonis. Lonicera involucrata. 
Campanula scouleri. Polygonum bistortoices. 
Crepis nana. Populus tremuloides. 
Erigeron salsuginosus. Salix barclayi. 
Gentiana newberryi. Saxifraga nivalis. 
Juncus orthophyllus, Saxifraga punctata. 
Lonicera conjugalis. 
(2) BOREAL SIERRA SPECIES NOY KNOWN FROM SHASTA OR TOE 
CASCADES. 
Hight mammals, 1 bird, 3 coniferous trees, several shrubs, and a num- 
ber of small plants are known from the High Sierra which do not occur 
on Shasta or the Uascades; the majority of them are restricted to the 
southern part of the Sierra, not reaching as far north as the mountains 
about Lake Tahoe, and consequently need not be considered here. 
Only three of the Sierra mammals (Spermophilus beldinyi, Hutamias 
spectosus frater, and Sorer obscurus) which range north to the south 
end of Feather River Gap fail to reach Shasta, and two if not all three 
of these are known to cross this gap and occur on Lassen, showing 
that the Feather River Gap of itself is of very little significance. The 
details of plant distribution in these mountains are not sufficiently 
known to admit of safe generalizations. 
