bulletin 94. 47 
We have taken specimens at the following points: Ft.Col¬ 
lins, Livermore, Windsor, Greeley, Julesburg, Boulder, Den¬ 
ver, Palmer Lake, Pueblo, Trinidad, Antonito, Alder, Salida 
and Buena Vista; and at altitudes varying between 4,500 and 
8,500 feet. The high altitude specimens are smaller in size, 
darker in color and could easily be taken for a different spe¬ 
cies from the brownish testaceous form found in the lower 
altitudes. 
The small males from high altitudes measure as small as 
16 mm. in length while the largest from lower altitudes meas¬ 
ure as high as 24 mm. The females measure between 18 
mm. and 27 mm. 
cuneatus Bruner. See Melanoplus occidehtalis . 
dawsoni Scudd. Our collections indicate that this species is con¬ 
fined to the foothills of the eastern slope of the mountains. 
It is not an abundant species but we have taken it from the 
border of the plains next the first foothills to an altitude of 
8,000 feet. Specimens have been taken as far south as Palm¬ 
er Lake. It is most common on the dry slopes of the lower 
foothills. The long winged form has not been taken. 
Males vary in length between 14 mm. and 17 mm. and 
their elytra between 4.5 mm. and 6 mm. The females vary 
in length between 18 mm. and 20 mm. and their elytra be¬ 
tween 5 mm. and 7 mm. Measurements upon 25 males and 
31 females. 
Specimens have been taken at Ft. Collins (at foothills), 
Dutch George’s, Steamboat Springs, Pinewood, Boulder and 
Palmer Lake. 
devastator Scudd. Two locusts taken at Steamboat Springs July 
26th, 1891, were determined by Dr. Scudder as belonging to 
this species with a question mark attached. Altitude about 
7,000 feet. 
differentialis Uhl. This is an abundant and very destructive species 
in the lower altitudes of the State, especially where there is 
plenty of moisture. Plxcept for the black markings of the 
posterior femora this species has no conspicuous markings 
but it varies much in color. I11 the warmer portions of the 
State the prevailing color is a light yellowish brown while in 
the higher and cooler portion the prevailing color is very 
much darker. In all places where the species occurs in the 
State there are occasional or frequent individuals that are 
black, except for yellow bands upon the legs, and sometimes 
light posterior lateral margins'to the pronotum. 
