44 
BULLETIN 94 . 
more, Stove Prairie, North Park, Pike’s Peak at 1,000 feet 
(Cockerell), Windsor, Greeley, Merino, Wray, Ft. Morgan 
Jnlesbnrg, Boulder, Lafayette, Denver, Palmer Lake, Canon 
City, Nepesta, Rockyford, Lamar, Holly, Trinidad, Colorado 
Springs, Salida, Bnena Vista, Gunnison, Delta, Paonia, Grand 
Junction, Palisades, Durango and Steamboat Springs. 
It seems probable that some of the reported occurrences 
of Melanoplus spretus should have been referred to this species. 
bivittatus Say. This is undoubtedly the most injurious grasshopper 
in Colorado. It is doubtful if any insect causes heavier annual 
loss to the State. It is nearly, and perhaps quite as widely 
distributed as femur-} ubrum. Its large size and great num¬ 
bers and its appetite for cultivated plants of nearly every kind, 
make it very destructive. It is especially numerous in the 
alfalfa fields of the irrigated region near the foothills. To¬ 
wards the eastern border of the State it is often out numbered 
by differ entialis. It is also abundant in the alfalfa and grain 
fields of the western slope and sometimes defoliates fruit trees 
when orchards are not kept cultivated or when they are along¬ 
side of alfalfa or pasture land. 
This species is capable of subsisting upon almost any 
cultivated crop. We have noted the following food plants: 
Alfalfa, red clover, grass, corn, wheat, oats, barley, fruit trees 
in general, cabbages, beets, potatoes and onions. 
It has a strong tendency to climb tall plants and fence 
posts to rest for the night. The injuries are usually worst 
about the borders of fields. 
There is comparatively little variation in the coloration 
of this species. The two yellow lines upon the elytra seem 
always to be present as a distinguishing characteristic; the 
head and pronotum are occasionally almost entirely pale yel¬ 
low in color. In size and in wing-length this species varies 
widely. Males of long winged specimens vary between 21 
mm. and 33 mm. in length and the females between 27 mm. 
and 41 mm. The majority of the specimens have elytra ex¬ 
ceeding the tip of the abdomen but individuals with abbre¬ 
viated wings are common and it is not very infrequent that 
they do not cover more that two-thirds of the abdomen. 
There are small males in the collection with elytra only 7.5 
mm. long. As in femur-rubrum , the short winged individ¬ 
uals average smaller than those having long wings. 
The earliest we have taken adults at Ft. Collins was June 
12, 1900. June 21, 1901, a single male was found, and on 
