52 
bulletin 94. 
The males vary in length between 14 mm. and 23 mm. 
and the females between 20 mm. and 26 mm. The elytra in 
the brachypterons forms vary between 4 mm. and 7 mm. in 
length in both sexes. 
The maeropterous form has been taken at Ft. Collins, 
Jnlesbnrg, Holly and Pueblo. The short-winged form has 
been taken at Ft. Collins, Jnlesbnrg, Wray, Sterling, Greeley, 
Colorado Springs, Pueblo, Canon City, Trinidad, Nepesta, 
Rockyford, Lajunta, Lamar and Holly. 
This species varies widely in size and coloration in Colo¬ 
rado. In some the yellowish-brown prevails, even upon the 
elytra and pronotnm; in others a decided greenish-yellow tint 
occurs 011 the same parts. At the other extreme there are 
those that are quite uniformly dark fuscous so that even the 
dark bands of the femora are hardly discernable. I am unable 
to find any constant characters separating this species from 
type specimens of M. marculentus from Mexico that are in 
the College collection. 
luridus Dodge. An abundant species in northern Colorado east of 
the mountains. It seems to be most numerous in the vicinity 
of the foothills but does not extend far into the hills. The 
native food-plant is Artemisia dracunculoides . The nymphs 
with their genae and sides of the pronotum (except a white 
median line on the latter) black, make conspicuous objects 
upon the stems of the food-plant. This species takes readily 
to some of the cultivated plants also. We have noted it feed¬ 
ing upon alfalfa, cabbages and leaves of plum and apple trees. 
In size the males vary between 19 mm. and 21 mm. and 
the females between 20 mm. and 26 mm. Measurements from 
61 males and 24 females. 
Adult males were just beginning to appear July 22 at Ft. 
Collins in 1901 (Ball). They were abundant at Laporte Sep. 
30, 1899, and specimens have been taken at Ft. Collins as late 
as Oct. 23, 1901. 
This species has also been noted as feeding upon Aige- 
loz'ia (Ball). 
But few females were ready to lay eggs Sep. 8, 1902(Ball). 
We have taken this species at the following places: Ft. 
Collins (abundant upon dry ground), Laporte, Livermore, 
Ft. Morgan, Colorado Springs and Boulder. 
minor Scudd. This is not an abundant species in Colorado but oc¬ 
curs in moderate numbers in the north-eastern portion over 
