THE GENUS DENDKOCTONUS. 15 
The species of Division II range from Guatemala northward to 
Alaska, eastward to the Atlantic coast, and across northern Europe 
and Russia into Siberia. 
Species 12 occupies the regions and sections of eastern larch from 
northwestern West Virginia, northward and westward, while species 
13 occupies the region of the Douglas fir, bigcone fir, and western 
larch from southern New Mexico and Arizona to Ventura County, 
CaL, and northward into British Columbia. 
Species 14 occupies the region of red spruce from the high moun- 
tains of Pennsylvania northward and from New Brunswick to north- 
western Michigan, and probably northwestward to the 100th meridian. 
Species 15 occupies the region of Engelmann spruce from the white 
spruce in western South Dakota westward, and north of southern 
New Mexico. 
Species 16 occupies the white-spruce region in Alaska, and species 
17 the Sitka-spruce region from southern Oregon to Sitka. 
Species 18 occupies the Lake Superior region; species 19 the region 
of lodgepole pine from central Colorado northward probably into 
British Columbia ; species 20 the regions of red spruce from the moun- 
tains of West Virginia into New York; while species 21 occupies the 
spruce and pine regions north of central Europe in Denmark and 
through Russia to eastern Siberia. 
Species 22 occupies the region of pitch pine, Virginia pine, yellow 
pine, loblolly pine, and longleaf pine from Long Island, New York, 
east of the Allegheny Mountains, southward to Florida and Texas, 
and west of the mountains from the Little Kanawha River probably 
through Kentucky and Tennessee, while species 23 occupies the 
regions of pine timber from the Atlantic to the Pacific north of the 
South Atlantic and Gulf States and south into the mountains of 
Guatemala. Species 24 is described from Guatemala. 
The distribution maps (figs. 11, 14, 17, etc.) show the known and 
probable ranges of each species, the known range being indicated 
by large dots and the probable range by small 'dots. 
The distribution of the genus is shown on a map of the world 
(PI. II.) 
HOST TREES. 
In Division I the species confine their attack to pine and spruce, 
but principally to the pines. 
Species 1 confines its attack to the western yellow and sugar pine, 
and is a destructive enemy of both. Species 2 attacks the western 
yellow pine, but, so far as observed, is much less destructive than its 
northern and western neighbor. It has also been found in the Doug- 
las fir, but this is evidently an abnormal habit. 
