20 
Valley of Minnesota, North Dakota, and Manitoba. I also observed it 
abundantly in the Prickly Pear and Gallatin Valleys of Montana, near 
the mouth of the Yellowstone, in North Dakofa, in portions of Wy- 
oming, Colorado, and the extreme western part of Nebraska. It also 
occurs in the New England States and British America. This is a 
species which readily adapts itself to any new locality, being the most 
easily acclimated of any of our injurious locusts. When onee domiciled, 
it is there to stay, and will require our earnest attention from time to 
time in the future. In fact 1 consider this locust, though not migratory, 
fully as destructive as the Rocky Mountain or true migratory locust, 
from the fact that it so soon becomes acclimated. 
Acridium americanum, Drury.—This large handsome locust is the 
species which occasionally devastates Yucatan, Central America, and 
Mexico, and even reaches the United States in injurious numbers along 
our southern coasts. It has also been known in dangerous numbers as - 
far northward as the Ohio River, and occurs sparingly as far north as 
the northern States, but [ imagine never reaches British America. 
Dendrotettix longipennis, the Post Oak Locust of Texas.—During the 
spring of 1887, while visiting Washington County, Tex., to investi- 
gate a local outbreak of an injurious locust, I heard of a species that 
was attacking the oaks of that particular region, and in some places 
entirely defoliating them. On my way from the region where I had 
been working to the city of Brenham, we passed through the infested 
locality, and I obtained some of the insects in question, which were then 
in the larval stage. <A careful examination proved the insect to be new 
and congeneriec with a species heretofore collected only in the vicinity 
of St. Louis, Mo., and which also occurred only on oak. About a 
year later this species was described by Professor hiley under the 
above name. The insect occurs in two forms, long-winged and short- 
winged. The former flies with great ease and often leaves the trees in 
midday and alights in fields and other clearings; with the least dis- 
turbance it flies to the tops of the adjoining trees. The larve and 
pupe are also exceedingly activeand run over the branches and trunks 
of trees with great rapidity. The eggs are laid in the ground around 
the bases of the trees. An area of at least 50 square miles of forests 
was completely defoliated by these insects during that and the previous 
year. 
Melanoplus spretus, Thomas, the Rocky Mountain or Migratory Lo- 
cust.—This is the insect which is generally referred to as the destruc- 
tive locust of North America and has caused more injury during the past 
20 years than any dozen of the other species combined. Itis this species 
which we most fear on account of its migratory habits; so marked is 
this trait that swarms hatching on the Saskatchewan have been traced 
to the Gulf of Mexico in one season. Its habits have been so frequently 
described that further mention is unnecessary. Suffice it to say that 
at the present time it is again decidedly on the increase along our north- 
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